This stan ard is also a pl ca le to in ivid al controls uti zed as p rt of a control s stem or controls whic are mec anical y integral with multif un tional controls havin non-electrical
Trang 1Automat ic elect rical cont rols –
Part 1: General requirement s
Disposit ifs de commande élect rique aut omat iques –
Part ie 1: Exigences générales
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Trang 3Automat ic elect rical cont rols –
Part 1: General requirement s
Disposit ifs de commande élect rique aut omat iques –
Part ie 1: Ex igences générales
INT ERNAT IONAL
ELECT ROT ECHNICAL
COMMIS ION
ELECT ROT ECHNIQUE
INT ERNAT IONALE
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Trang 5IEC 60730- 1
Editio 5.1 2 15-12
Automat ic elect rical cont rols –
Part 1: General requirement s
Disposit ifs de commande élect rique aut omat iques –
Part ie 1: Exigences générales
Trang 6CONTENTS
FOREWORD 7
1 Sco e an normative referen es 10 2 Terms an definition 15 3 General req irements 3
4 General notes on tests 3
5 Ratin 41
6 Clas ification 41
7 Information 4
8 Protection again t electric s oc 5
9 Provision f or protective e rthin 61
10 Terminals an termination 6
1 Con tru tional req irements 7
12 Moisture an d st resistan e 9
13 Electric stren th an in ulation resistan e 9
14 He tin 9
15 Man f acturin deviation an drift 101
16 En ironmental stres 10
17 En uran e 10
18 Mec anical stren th 1 2
19 Thre ded p rts an con ection 1 9
2 Cre p ge distan es, cle ran es an distan es throu h sol d in ulation 12
21 Resistan e to he t, fire an trac in 131
2 Resistan e to cor osion 13
2 Electromag etic comp tibi ty (EMC) req irements – Emis ion 13
2 Comp nents 13
2 Normal o eration 13
2 Electromag etic comp tibi ty (EMC) req irements – Immu ity 13
2 Abnormal o eration 13
2 Guidan e on the u e of electronic dis on ection 14
An ex A (normative) In el bi ty of markin s 16
An ex B (normative) Me s rement of cre p ge distan es an cle ran es in air 16
An ex C (normative) Coton u ed f or merc ry switc test (not a plca le in the
cou tries memb rs of CENELEC) 16
An ex D (inf ormative) He t, f ire an trac in 16
An ex E (normative) Circ it for me s rin le kage c r ent 16
An ex F (inf ormative) Fire hazard testin 17
An ex G (normative) He t an fire resistan e tests 171
An ex H (normative) Req irements f or electronic controls 17
An ex J (normative) Req irements f or thermistor elements an controls u in
thermistors 2 7
An ex K (informative) Nominal voltages of s p ly s stems for diff erent modes of
overvoltage control 2 5
Trang 7© IEC 2 15
An ex L (normative) Overvoltage categories 2 7
An ex M (informative) Typical u age 2 8
An ex N (normative) Pol ution degre s 2 9
An ex P (normative) Printed circ it b ard co tin p r orman e test 2 0
An ex Q (normative) Printed circ it b ard co tin p rorman e test 2 2
An ex R (inf ormative) Explanatory notes for s rge immu ity test 2 5
An ex S (informative) Guidan e f or a plyin Clau e 2 2 0
An ex T (normative) Req irements f or SELV an PELV 2 2
An ex U (normative) Req irements f or relay when u ed as controls in IEC 6 3 5
Fig re 8 – Ap aratu for testin d ra i ty of markin s on ratin la els 14
Fig re 9 – Ap aratu for flexin test 14
Fig re 10 – Screw terminals an stu terminals (1 of 2) 14
Fig re 2 – Diagram f or le kage c r ent me s rement at o eratin temp rature for
sin le-phase con ection of clas I controls 15
Fig re 2 – Diagram for le kage c r ent me s rement at o eratin temp rature f or
sin le-phase con ection of controls other than clas I 15
Fig re 2 – Diagram for le kage c r ent me s rement at o eratin temp rature for
thre -phase con ection of clas I controls 15
Fig re 2 – Diagram for le kage c r ent me s rement at o eratin temp rature f or
thre -phase con ection of controls other than clas I 15
Fig re 2 – Diagram for le kage c r ent me s rement at o eratin temp rature f or
sin le-phase con ection of controls other than clas I 15
Fig re 3 – Diagram for le kage c r ent me s rement at o eratin temp rature f or
two-phase con ection of controls to thre -wire, grou d neutral s p ly other than
clas I 15
Fig re B.1 – Nar ow gro ve 16
Trang 8Fig re B.2 – Wide gro ve 16
Fig re B.3 – V-s a ed gro ve 16
Fig re B.4 – Rib 16
Fig re B.5 – Un emented joint with nar ow gro ve 16
Fig re B.6 – Un emented joint with wide gro ve 16
Fig re B.7 – Un emented joint with nar ow an wide grooves 16
Fig re B.8 – Divergin side wal s 16
Fig re B.9 – Nar ow reces 16
Fig re B.10 – Wide reces 16
Fig re B.1 – Con u tive f lo tin p rt 16
Fig re E.1 – Circ it for me s rin le kage c r ents 16
Fig re H.1 – V-Model f or the software lfe c cle 19
Fig re H.2 – Voltage variation test 215
Fig re H.3 – Rin wave c aracteristic (o en-circ it voltage) 2 0
Fig re H.4 – Sc ematic of a rin wave generator 0,5 µs /10 kHz 2 0
Fig re H.5 – Example of an electronic circ it with low p wer p ints 2 5
Fig re J.1 – Test circ it f or inru h-c r ent l mitin thermistor en uran e test 2 3
Fig re P.1 – Test sample 2 1
Fig re Q.1 – Test sample 2 3
Fig re Q.2 – Examples of lan con g ration (se also Fig re Q.1) 2 4
Fig re R.1 – Example of s rge protection by s ieldin in buidin s with common e rth
referen e s stems 2 8
Fig re R.2 – Example of secon ary s rge protection in bui din s with se arate
common e rth ref eren e s stems 2 8
Fig re R.3 – Example of primary an secon ary s rge protection of in o r/outdo r
eq ipment 2 9
Fig re S.1 – Guidan e flowc art for a pl cation of req irements of Clau e 2 2 0
Ta le 1 (7.2 of edition 3) – Req ired information an method of providin information
(1 of 4) 5
Ta le 2 (9.3.2 of edition 3) – Quic con ect terminal dimen ion (Canada and USA) 6
Ta le 3 (10.1.4 of edition 3) – Minimum cros -sectional are of con u tors 6
Ta le 4 (10.1.8 of edition 3) – Terminal con u tors 6
Ta le 5 (10.1.9 of edition 3) – Con u tor pul test values 6
Ta le 6 (10.2.1 of edition 3) – Nominal cros -sectional are s of con u tors 7
Ta le 7 (10.2.4.2 of edition 3) – Material an platin for ta s 71
Ta le 8 (10.2.4.3 of edition 3) – Axial force values f or ta in ertion an with rawal 71
Ta le 9 (1 7.2 of edition 3) – Pul an torq e values 8
Ta le 10 (1 8.2 of edition 3) – Minimum cord con u tor sizes 8
Ta le 1 (13.1 of edition 3) – Minimum in ulation resistan e 9
Ta le 12 (13.2 of edition 3) – In ulation or dis on ection test voltages a (1 of 2) 9
Ta le 13 (14.1 of edition 3) – Maximum he tin temp ratures (1 of 3) 9
Ta le 14 (17.2.1 of edition 3) – Electrical con ition for the overvoltage test ( his ta le
a ples in al cou tries ex e t Canada, an the USA) 10
Trang 9© IEC 2 15
Ta le 15 (17.2.2 of edition 3) – Electrical con ition f or the overlo d tests of 17.7 an
17.10 ( his ta le a pl es in Canada, USA, an al cou tries whic u e an overlo d test 10
Ta le 16 (17.2.3 of edition 3) – Electrical con ition for the overlo d tests of 17.8,
17.9, 17.1 , 17.12 an 17.13 ( his ta le a pl es in Canada, USA, a d a c u tries
whic use a o erload test) 10
Ta le 17 (18.4.1 of edition 3) – Minimum thic nes of s e t metal for en los res made
of carb n ste l or stainles ste l 1 5
Ta le 18 (18.4.2 of edition 3) – Minimum thic nes of s e t metal for en los res of
aluminium, co p r or bras 1 6
Ta le 19 (18.7 of edition 3) – Pul -cord force test values 1 8
Ta le 2 (19.1 of edition 3) – Thre ded p rts torq e test values 12
Ta le 21 (2 1 of edition 3) – Rated impulse voltage f or eq ipment energized directly
f rom the s p ly main (f om IEC 6 6 4-1:2 0 , Ta le F.1) 12
Ta le 2 (2 2 of edition 3) – Cle ran es for in ulation co-ordination (fom
IEC 6 6 4-1:2 0 , Ta le F.2) 12
Ta le 2 (2 3 of edition 3) – Minimum cre p ge distan es for b sic in ulation 12
Ta le 2 (2 4 of edition 3) – Minimum cre p ge distan es for f un tional in ulation 12
Ta le 2 (21.4 of edition 3) – Merc ry switc s ort-circ it con ition 13
Ta le 2 (2 2.3 of edition 3) – Maximum win in temp rature (f or test of mec anical
Ta le H.2 – Semi- ormal method 19
Ta le H.3 – Software arc itecture sp cification 2 0
Ta le H.4 – Mod le desig sp cif i ation 2 1
Ta le H.5 – Desig an codin stan ard 2 1
Ta le H.6 – Software mod le testin 2 2
Ta le H.7 – Software integration testin 2 3
Ta le H.8 – Software saf ety val dation 2 3
Ta le H.9 (H.1 12.6 of edition 3) – Combination of analytical me s res d rin
hardware develo ment 2 4
Ta le H.14 – Voltage dips, s ort inter uption an voltage variation 214
Ta le H.15 (H.2 5.4.2 of edition 3) – Test values f or voltage variation 215
Ta le H.16 (H.2 8.2 of edition 3) – Test voltages f or test level 2 (de en in on the
Trang 10Ta le H.21 – In re sed test level f or radiated immu ity (ISM, GSM, DECT b n s) 2 2
Ta le H.2 (H.2 13.2 of edition 3) – Test level f or s p ly f req en y variation 2 3
Ta le H.2 (H.2 14.2 of edition 3) – Test level f or contin ou field 2 4
Ta le H.2 (H.2 1 of edition 3) – Electrical/electronic comp nent f ault modes ta le
(1 of 3) 2 8
Ta le J.1 – Maximum c r ent 2 9
Ta le J.2 (J.7, 7.2 of edition 3) – Normal o eratin con ition 2 0
Ta le J.3 – Samples f or the test (clau e referen e) 2 1
Ta le J.4 – Electrical an thermal ratin s of a thermistor 2 2
Ta le J.5 – Ad itional items to Ta le 1 2 4
Ta le J.6 – Seq en e of cal bration an con itionin tests for PTC thermistors 2 6
Ta le J.7 – Clas es f or PTC sen in thermistors 2 7
Ta le J.8 – Seq en e of cal bration an con itionin tests f or NTC thermistors 2 8
Ta le J.9 – Clas es f or NTC sen in thermistors 2 8
Ta le J.10 – Numb r of c cles for en uran e test 2 1
Ta le J.1 – Agein test temp rature 2 2
Ta le J.12 – Numb r of c cles for en uran e test 2 3
Ta le K.1 – In erent control or eq ivalent protective control 2 5
Ta le K.2 – Cases where protective control is neces ary an control is provided by
s rge ar esters havin a ratio of clampin voltage to rated voltage not smal er than that
sp cified by IEC 6 0 9-1 2 6
Ta le M.1 – Typical u age 2 8
Ta le P.1 – En ironmental c cln con ition 2 0
Ta le Q.1 – IEC 6 6 4-3 test levels or con ition 2 2
Ta le S.1 – Example A – Usin An ex S g idan e for a plyin Clau e 2 2 1
Ta le S.2 – Example B – Usin An ex S g idan e for a plyin Clau e 2 2 1
Trang 11© IEC 2 15
Part 1: General requirements
1 Th Intern tio al Ele trote h ic l Commis io (IEC) is a worldwid org niz tio for sta d rdiz tio c mprisin
al n tio al ele trote h ic l c mmite s (IEC Natio al Commite s) Th o je t of IEC is to promote
intern tio al c -o eratio o al q e tio s c n ernin sta d rdiz tio in th ele tric l a d ele tro ic f i ld To
this e d a d in a ditio to oth r a tivitie , IEC p bls e Intern tio al Sta d rd , Te h ic l Sp cif i atio s,
Te h ic l Re orts, Pu lcly Av ia le Sp cif i atio s (P S) a d Guid s (h re f ter refere to a “IEC
Pu lc tio (s)”) Th ir pre aratio is e tru te to te h ic l c mmite s; a y IEC Natio al Commite intere te
in th s bje t d alt with ma p rticip te in this pre aratory work Intern tio al g v rnme tal a d n
n-g v rnme tal org niz tio s laisin with th IEC als p rticip te in this pre aratio IEC c la orate clo ely
with th Intern tio al Org niz tio for Sta d rdiz tio (ISO) in a c rd n e with c n itio s d termin d b
a re me t b twe n th two org niz tio s
2) Th f ormal d cisio s or a re me ts of IEC o te h ic l maters e pre s, a n arly a p s ible, a intern tio al
c n e s s of o inio o th rele a t s bje ts sin e e c te h ic l c mmite h s re re e tatio fom al
intere te IEC Natio al Commite s
3) IEC Pu lc tio s h v th f orm of re omme d tio s f or intern tio al u e a d are a c pte b IEC Natio al
Commite s in th t s n e Whie al re s n ble eff orts are ma e to e s re th t th te h ic l c nte t of IEC
Pu lc tio s is a c rate, IEC c n ot b h ld re p n ible f or th wa in whic th y are u e or f or a y
misinterpretatio b a y e d u er
4) In ord r to promote intern tio al u iformity, IEC Natio al Commite s u d rta e to a ply IEC Pu lc tio s
tra s are tly to th ma imum e te t p s ible in th ir n tio al a d re io al p blc tio s An div rg n e
b twe n a y IEC Pu lc tio a d th c re p n in n tio al or re io al p blc tio s al b cle rly in ic te in
th later
5) IEC its lf d e n t pro id a y ate tatio of c nformity In e e d nt c rtific tio b die pro id c nformity
a s s me t s rvic s a d, in s me are s, a c s to IEC mark of c nf ormity IEC is n t re p n ible for a y
s rvic s c rie o t b in e e d nt c rtif i atio b die
6) Al u ers s o ld e s re th t th y h v th late t e itio of this p blc tio
7) No la i ty s al ata h to IEC or its dire tors, emplo e s, s rv nts or a e ts in lu in in ivid al e p rts a d
memb rs of its te h ic l c mmite s a d IEC Natio al Commite s f or a y p rs n l injury, pro erty d ma e or
oth r d ma e of a y n ture wh ts e er, wh th r dire t or in ire t, or for c sts (in lu in le al fe s) a d
e p n e arisin o t of th p blc tio , u e of, or rela c u o , this IEC Pu lc tio or a y oth r IEC
Pu lc tio s
8) Ate tio is drawn to th Normativ refere c s cite in this p blc tio Us of th refere c d p blc tio s is
in is e s ble for th c re t a plc tio of this p blc tio
9) Ate tio is drawn to th p s ibi ty th t s me of th eleme ts of this IEC Pu lc tio ma b th s bje t of
p te t rig ts IEC s al n t b h ld re p n ible f or id ntif yin a y or al s c p te t rig ts
DISCLAIMER
This Con ol d te version is not a of f icial IEC Sta dard a d ha be n prepare f or
us r conv nie c Only the c r e t v rsion of the sta dard a d its ame dme t s)
are to be con idere the of f icial doc me ts
This Consol date v rsion of IEC 6 7 0-1 be rs th e ition number 5.1 It consists of
cor ige dum 1 (s ptember 2 14), a d its ame dme t 1 (2 15-12) [doc me ts
7 /1017/FDIS a d 7 /10 6/RVD] The te hnic l conte t is ide tic l to the ba e e ition
a d its ame dme t
In this Re l ne v rsion, a v rtic l l ne in the margin s ows where the te hnic l conte t
is modif ie by ame dme t 1 Addition are in gre n te t, deletions are in strik throug
re te t A s parate Final v rsion with al c a ge a c pte is a ai able in this
publ cation
Trang 12International Stan ard IEC 6 7 0-1 has b en pre ared by IEC tec nical commit e 7 :
Automatic electrical controls
This edition con titutes a tec nical revision The major c an es with resp ct to the previou
edition are as folows
– modif i ation of the title an s o e;
– revision to Clau e H.2 b sed on c an es in tec nolog , a pl cation , an to improve
con isten y an layout;
– modification to Ta le H.12 to al g with CISPR 2 ;
– revision to An ex J to cor elate the fault modes of thermistors an to exempt thermistors
u ed in conju ction with typ 1 controls in SELV low p wer circ its f rom the tests sp cified
in An ex J;
– new req irements coverin b tery-p wered controls, an the u e of b t eries in controls;
– revision ad res in the ex lu ion of relay faults;
– new/updated req irements in Clau e 2 , for switc mode p wer s p l es;
– revision coverin the al owan e of s rewles -typ clampin u its complyin with
IEC 6 9 9-1;
– new req irements ad res in remotely actuated control fu ction ;
– ad ition of a new/updated le kage c r ent diagram to al g the An ex E diagram with the
diagram in IEC 6 9 0;
– updated req irements f or temp rature sen in controls
A l st of al p rts of the IEC 6 7 0 series, u der the general title: Automat ic ele tric l c ntrols,
can b f ou d on the IEC we site
In the develo ment of a ful y international stan ard to cover automatic controls f or hou ehold
an simi ar u e, it has b en neces ary to take into con ideration the diff erin req irements
res ltin f rom practical exp rien e in variou parts of the world an to recog ize the variation
in national electrical s stems an wirin rules
The “in some cou tries” notes regardin dif ferin national practices are contained in the
Trang 13It is en isaged that in the next edition of this stan ard it wi b fou d p s ible to remove
those diff eren es that are covered by new IEC stan ard now b in pre ared by other
tec nical commit e s
This p rt 1 is to b u ed in conju ction with the a pro riate p rt 2 for a p rtic lar typ of
control, or for controls for p rtic lar a plcation This p rt 1 may also b a pl ed, so far as
re sona le, to controls not mentioned in a p rt 2, an to controls desig ed on new prin iples,
in whic cases ad itional req irements may b con idered to b neces ary
Where, for a p rtic lar clau e or s bclau e, the text of p rt 2 in icates:
Add ition: the p rt 1 text a pl es with the ad itional req irement in icated in a p rt 2;
Mod ific tion: the p rt 1 text a pl es with a minor c an e as in icated in a p rt 2;
Re la eme t: the p rt 2 text contain a c an e whic re laces the p rt 1 text in its entirety
Where no c an e is neces ary, the p rt 2 in icates that the relevant clau e or s bclau e
a ples
NOT In this sta d rd th folowin print ty e are u e :
– Req irements pro er: in roman typ ;
– Test sp cific tions: in itali type;
– Ex la atory mater: in smaler roma ty e;
– Defined terms: bold type
Some ta le titles contain referen e in brac ets to ta le n mb rs in IEC 6 7 0-1, edition 3 f or
e se of cor elation b twe n p rts 2 an the Part 1
This publ cation has b en drafted in ac ordan e with the ISO/IEC Directives, Part 2
The commite has decided that the contents of the b se publ cation an its amen ment wi
remain u c an ed u ti the sta i ty date in icated on the IEC we site u der
"htp:/we store.iec.c " in the data related to the sp cific publcation At this date, the
IMPORTANT – Th 'colour in ide' logo on the cov r pa e of this publ c tion indic te
that it contains colours whic are consid re to be us f ul f or th cor e t
understa din of its conte ts Us rs s ould theref ore print this doc me t usin a
colour printer
Trang 14AUTOMA TIC ELECTRICA L CONTROLS –
Part 1: General requirements
1 Scope and normative ref erences
1.1 Scope
In general, this p rt of IEC 6 7 0 a ples to automatic ele tric l controls f or u e in, on, or in
as ociation with eq ipment for hou ehold an simiar u e The eq ipment may u e electricity,
gas, oi , sold f uel, solar thermal energ , etc or a combination there f
NOT 1 Thro g o t this sta d rd th word "e uipme t" me n "a pla c a d e uipme t."
EX MPLE 1 Co trols for a pla c s within th s o e of IEC 6 3 5
This International Stan ard is a pl ca le to controls f or bui din automation within the s o e
of ISO 16 8
This stan ard also a pl es to automatic ele tric l controls for eq ipment that may b u ed
by the publ c, s c as eq ipment inten ed to b u ed in s o s, off i es, hospitals, f arms an
commercial an in u trial a pl cation
EX MPLE 2 Co trols for c mmercial c terin , h atin a d airc n itio in e uipme t
This stan ard is also a pl ca le to in ivid al controls uti zed as p rt of a control s stem or
controls whic are mec anical y integral with multif un tional controls havin non-electrical
outputs
EX MPLE 3 In e e d ntly mo nte water v lv s, co trols in smart grid s stems a d co trols for b idin
a tomatio s stems within th s o e of ISO 16 8 -2
This stan ard is also a plca le to relay when u ed as controls for IEC 6 3 5 a plan es
Ad itional req irements for the safety an o eratin v lue of relay when u ed as controls
f or IEC 6 3 5 a plan es are contained in An ex U
NOT 2 Th s re uireme ts are ref ere to in th s o e of IEC 61810-
NOT 3 This sta d rd is inte d d to b u e for th te tin of a y sta d-alo e rela whic is inte d d to b u e
a a co trol of a a pla c a c rdin to IEC 6 3 5- It is n t inte d d to b u e for a y oth r sta d-alo e
rela , or tore la e th IEC 61810 s rie of sta d rd
This stan ard do s not a ply to automatic ele tric l controls inten ed ex lu ively for
in u trial proces a pl cation u les explcitly mentioned in the relevant p rt 2 or the
eq ipment stan ard
1.1.1 This International Stan ard a pl es to the in erent saf ety, to the operating v lue ,
operating time , an operating s que c s where s c are as ociated with eq ipment
safety, an to the testin of automatic ele tric l control devices u ed in, or in as ociation
with, eq ipment
This stan ard a pl es to controls u in thermistors, se also An ex J
Trang 15© IEC 2 15
This stan ard is also a plca le to the functional s fety of low comple ity s fety relate
s stems an controls
1.1.2 This stan ard a pl es to automatic ele tric l controls, mec anical y or electrical y
o erated, resp n ive to or control n s c c aracteristic as temp rature, pres ure, p s age
of time, h midity, l g t, electrostatic ef fects, flow, or l q id level, c r ent, voltage, ac eleration,
or combination there f
1.1.3 This stan ard a ples to startin relay , whic are a sp cific typ of automatic
ele tric l control inten ed to switc the startin win in of a motor Su h controls may b
buit into, or b se arate fom, the motor
1.1.4 This stan ard a pl es to ma u l controls when s c are electrical y an /or
mec anical y integral with a tomatic controls
NOT Re uireme ts for ma u l switc e n t f ormin p rt of a automatic co trol are c ntain d in IEC 610 8-
1.1.5 This stan ard a pl es to a.c or d.c p wered controls with a rated voltage not
ex e din 6 0 V a.c or 6 0 V d.c
1.1.6 This stan ard do s not take into ac ou t the re p ns value of an a tomatic a tion
of a control if s c a re p ns v lue is de en ent up n the method of mou tin the
control in the eq ipment Where a re pon e v lue is of sig if i ant purp se for the protection
of the us r, or s r ou din s, the value defined in the a pro riate hou ehold eq ipment
stan ard or as determined by the man facturer s al a ply
1.1.7 This stan ard a pl es also to controls in orp ratin ele tronic de ic s, req irements
f or whic are contained in An ex H
1.1.8 This stan ard a pl es also to controls u in NTC or PTC thermistors, req irements
for whic are contained in An ex J
1.2 Normativ ref ere c s
The fol owin doc ments, in whole or in p rt, are normatively referen ed in this doc ment an
are in isp n a le for its a pl cation For dated ref eren es, only the edition cited a pl es For
u dated ref eren es, the latest edition of the ref eren ed doc ment (in lu in an
amen ments) a ples
IEC 6 0 8, IEC sta dard v lta es
IEC 6 0 5:2 01, Aud io, video a d similar electro ic a p rat us – Safety re uireme ts
Trang 16IEC 6 0 8-2-7 , Enviro me tal t est ing – P art 2-7 5: Tests – Test Eh: Hammer t ests
IEC 6 0 5, Ele tric l nsulatio – Th rmal e aluat ion a d d esign tion
IEC 6 0 9-1, Surg arest ers – P art 1: N on-li e r resistor type g p ed ar esters for a.c
systems
2
IEC 6 1 2:2 0 , Method for th d etermin tion of the pro f a d t he c mp rative tra king
ind ic s of so d insulatin mat erials
3
Amen ment 1:2 0
IEC 6 12 -1, Miniature fuses – P art 1: Definit io s for miniat ure fuses a d g n ral
re uireme ts for miniature fuse-li ks
IEC 6 2 7-1, P oly inyl c lorid e insulated c bles of rated v lt ag s u to a d includ ing
450/7 50 V – P art 1: Ge eral re uireme ts
IEC 6 2 5-1, Ru b r insulated c bles – Rat ed v lta es u to a d in lud ing 450/7 50 V –
P art 1: Ge eral re uireme ts
IEC 6 2 9-1, L w-v lta e fuses – P art 1:Ge eral re uireme ts
IEC 6 3 5-1:2 10, Ho se old a d similar electrical a p a c s – Safety – P art 1: Ge eral
re uireme ts
IEC 6 3 4 (al p rts), L w-v lta e ele tric l nst allat ions
IEC 6 3 4-14, Fixed c p citors for use in electro ic e uipme t – P art 14: Se tio al
sp cific t io : Fix ed c p cit ors for ele troma n t ic int erere c su pres ion a d c n e t io to
the su ply mains
IEC 6 3 4-16, Fixed c p citors for use in electro ic e uipme t – P art 16: Se tio al
sp cific t io : F ix d metallized p lypro yle e film d ielectric d.c c p citors
IEC 6 3 4-17, Fixed c p citors for use in electro ic e uipme t – P art 17 : Se tio al
sp cific t io : F ix d metalliz d p ly ro yle e film d ielectric a.c a d p lse c p citors
IEC 6 417 (al p rts), Gra hic l symb ls for use o e uipme t
IEC 6 4 3, Co d uit systems for c ble ma a eme t – Outsid e d iameters of c nduits for
ele tric l nstallations a d thre ds for c nduits a d fittings
4
Amen ment 1:19 9
IEC 6 5 9 (al p rts), Dire t ly h at ed n g t ive temp rat ure c eficie t thermist ors
IEC 6 6 4-1:2 0 , Insulation c ord inat io for e uipme t within low-voltag systems – P art 1:
P rinciples, re uireme ts a d tests
Trang 17© IEC 2 15
IEC 6 6 4-3:2 0 , Insulation c ord inat io for e uipme t within low-voltag systems – P art 3:
Use of c ating, p t tin or mo ld ing for prote tio a ainst p ll t io
Amen ment 1:2 10
IEC 6 6 4-4, I nsulation c ord inat ion for e uipme t within low-voltag systems – P art 4:
Co sid erat ion of high-fe u n y voltag stres
IEC 6 6 5-2-10, Fire Ha ard test in – P art 2-10: Glowin /h twire b sed test methods –
Glow-wire a p ratus a d c mmo test pro edure
IEC 6 6 5-2-1 :2 0 , F ire h z rd testin – Part 2-1 : Glowing/h twire b sed test meth ds –
Glow-wire flamma ility test met hod for e d -prod ucts
IEC 6 6 5-10-2, Fire h z rd t esting – P art 10-2: Ab ormal h at – Bal pres ure t est
IEC 6 7 8-1, Th rmistors – Dire tly h ated p sit ive temp rature c eficient – P art 1: Ge eric
sp cific tio
IEC 6 7 8-1-1, Th rmistors – Dire t ly h at ed p sitive ste -fu ction temp rat ure c eficie t –
P art 1-1: Blan d eta sp cific t ion – Cure t limiting a p c tio – As es me t lev l EZ
IEC 6 9 7-1:2 0 , Low-volt ag switc g ar a d c ntrolg ar – P art 1: Ge eral rules
IEC 6 9 8-2-2, Co n ct ing devic s for low-voltag circ its for h use old a d similar
p rp ses – P art 2-2: P artic lar re uireme ts for c n e ting d evic s as se arate e tities wit h
screwles -ype clampin u its
IEC 6 9 8-2-3, Co n ct in devic s for low-voltag circ its for h use old a d similar
p rp ses – P art 2-3: P artic lar re uireme ts for c n e t ing d evic s as se arate e t ities wit h
insulat io -piercin clamping u its
IEC 6 9 9-1, Co n cting d evic s – Electric l c pp r c ndu tors – Safety re uireme ts for
screw-y e a d screwles -y e clampin u its – P art 1: Ge eral re uireme ts a d p rt ic lar
re uireme ts for clampin u its for c nd uctors fom 0,2 mm
2
u t o 35 mm
2
(includ ed)
IEC 610 0 (al p rts), Electroma n t ic c mp tibility (EMC)
IEC 610 0-3-2, Elect roma n t ic c mp tibility (EMC) – P art 3-2: Limits – Limits for h rmo ic
c re t emis ions (e uipme t inp t c r e t ≤ 16 A p r p ase)
IEC 610 0-3-3:2 0 , Electroma n t ic c mp tibility (EMC) – P art 3-3: Limits – Limitatio of
v ltag c a g s, v ltag fluctuatio s a d fli k er in p b c low-voltag su ply systems, for
e uipme t with rat ed c re t ≤16 A p r ph se a d n t su je t to c nd it io al c n e tion
IEC 610 0-4-2:2 0 , Electroma n t ic c mp t ibility (EMC) – P art 4-2: Testing a d
me sureme t tec niqu s – Electrostat ic d isc arge immu ity test
IEC 610 0-4-3, Electroma n tic c mp tibility (EMC) – P art 4-3: Test in a d me sureme t
te h iqu s – Rad iat ed , rad io-fe u n y, electroma n t ic field immu ity test
IEC 610 0-4-4, Electroma n t ic c mp t ibility (EMC) – P art 4-4: Testing a d me sureme t
te hniq es – Electric l fast tra sie t/b rst immu it y t est
IEC 610 0-4-5, Electroma n t ic c mp tibility (EMC) – P art 4-5: Test ing a d me sureme t
te h iqu s – Surg immu ity test
Trang 18IEC 610 0-4-6, Electroma n t ic c mp tibility (EMC) – P art 4-6: Test in a d me sureme t
te h iqu s – I mmu ity to c ndu ted d isturb n es, induc d b rad io-fe u n y fields
IEC 610 0-4-8, Electroma n t ic c mp t ibility (EMC) – P art 4-8: Testing a d me sureme t
te hniq es – P ower fe u n y ma n tic field immu ity test
IEC 610 0-4-1 , Electroma n tic c mp tibility (EMC) – P art 4-1 : Test ing a d me sureme t
te h iqu s – Volt ag d ips, sh rt inter u tions a d v lta e variat io s immu ity tests
IEC 610 0-4-13:2 0 , Ele troma n t ic c mp tibility (EMC) – Part 4-13: Testing a d
me sureme t te h iq es – Harmo ics a d int erh rmo ics in luding mains sign lling at a.c
p wer p rt , low fe u n y immu ity tests
Amen ment 1:2 0
IEC 610 0-4-2 , Electroma n tic c mp t ibility (EMC) – P art 4-2 : Test ing a d me sureme ts
te h iqu s – Variatio of p wer fe u n y, immu ity t est
IEC 610 8-1, Switc es for ap lian es – P art 1: Ge eral re uireme ts
IEC 61210, Co n ct in devic s – Flat q ick -c n e t terminat io s for ele tric l c p er
c nd uct ors – Safety re uireme ts
IEC 612 9 (al p rts), Materials for printed b ards a d oth r interc n e ting stru tures
IEC 615 8-2-6, Safety of tra sformers, re ctors, p wer su ply u its a d similar produ ts for
su ply v lta es u to 1 10 V – P art 2-6: P artic lar re uireme ts a d test s for safety isolating
tra sformers a d p wer su ply u its inc rp rating safety isolating tra sformers
IEC 615 8-2-16, Safety oftra sformers, re ct ors, p wer su ply u its a d similar prod ucts for
v lt ag s u t o 1 10 V – P art 2-16: P artic lar re uireme ts a d t ests for switc mod e p wer
su ply u its a d tra sformers for switc mod e p wer su ply u its
IEC 616 3-1 , L w-voltag surg prote t iv d evic s – P art 1 : Surg prot ect ive d evic s
c n e t ed to low-v lt ag p wer syst ems – Re uireme ts a d test methods
IEC 6 3 6 (al p rts), Printed b ards
CISPR 1 , I nd ustrial, scie tific a d med ic l e uipme t – Rad io-fe u n y d isturb n e
c ara terist ics – Limits a d meth ds of me sureme t
CISPR 14-1:2 0 , Electroma n tic c mp t ibility – Re uireme ts for h use old a plian es,
ele tric to ls a d similar a p rat us – P art 1: Emis ion
5
Amen ment 1:2 0
CISPR 2 :2 0 , Information tec n lo y e uipme t – Rad io d ist urb n e c ara terist ics –
Limits a d meth ds of me sureme t
ISO 16 8 -2, Bu d ing a tomat ion a d c ntrol systems (BACS) – P art 2: Hardware
_ _ _ _ _ _
5
Th re e ists a c n old te e itio 5.1:2 0 in lu in CISPR 14- :2 0 a d its Ame dme t 1:2 0
Trang 19© IEC 2 15
2 Terms and def initions
For the purp ses of this doc ment, the f ol owin terms an def i ition a ply
Where the terms "voltage" an "c r ent" are u ed, they imply the r.m.s values, u les
otherwise sp cified
Definitions relatin to rating , volta e , c r e ts, fre ue cie , a d wat a e2.1
2.1.1
rate volta e, c r e t, fre u nc or wat a e
voltage, c r ent, f eq en y or watage as ig ed to a control by the man f acturer
Note 1 to e try: For thre p a e s p ly, th rate v lta e is th ln v lta e
2.1.2
rate volta e, c r e t, fre u nc or wat a e ra g
voltage, c r ent, feq en y or watage ran es as ig ed to the control by the man facturer
an expres ed by lower an up er values
2.1.3
working volta e
hig est r.m.s value of the a.c or d.c voltage acros an p rtic lar in ulation whic can oc ur
when the eq ipment is s p l ed at rated voltage
Note 1 to e try: Transient o erv ltage are disre ard d
Note 2 to e try: Op n-circ it c n itio s a d n rmal o eratin c n itio s are ta e into a c u t
2.1.4
e tra-low volta e
ELV
nominal voltage not ex e din 5 V b twe n con u tors an b twe n con u tors an e rth,
or f or thre -phase con ection not ex e din 5 V b twe n l ne con u tors an 2 V b twe n
l ne con u tors an neutral
Note 1 to e try: Th s v lu s were d riv d f rom IEC 6 3 5- :2 10, De nitio 3.4.1
Note 2 to e try: In this sta d rd E V-le els for u e in as e ific a plc tio a s e ifie in th rele a t a plc tio
sta d rd ma b d clare for co trols u e in or with s c a plc tio s f or e viro me tal c n itio s a s e ifie
b th a plc tio sta d rd
2.1.5
s fety e tra-low volta e
SELV
nominal voltage for u e in a SELV s stem or PELV s stem b twe n con u tors an b twe n
con u tors an e rth, not ex e din 42 V b twe n con u tors, or in the case of thre -phase
circ its, not ex e din 2 V b twe n con u tors an neutral, the no-lo d voltage of the circ it
not ex e din 5 V an 2 V, resp ctively, an whic is provided by a b t ery or when
o tained f rom hig er voltage is provided by a s f ety isolating tra sf ormer or a con erter
with se arate win in s
Note 1 to e try: Th v lta e lmits are b s d o th a s mptio th t th s f ety isolatin transf ormer is s p le
at its rate v lta e
Note 2 to e try: Co v rters with s p rate win in s pro idin e uiv le t in ulatio are d alt with in IEC 615 8-2-6
a d IEC 615 8-2- 6
Note 3 to e try: In Ca a a a d th USA,th lmit f or s fety extra-low v ltage is 3 V
Note 4 to e try: Als s e 2.1.2 S LV system a d 2.1.21 P LV system
Trang 20s fety isolating tra sf ormer
tran former, the input win in of whic is electrical y se arated f rom the output win in by an
in ulation at le st eq ivalent to double ins lation or reinf orc d ins lation, an whic is
inten ed to s p ly s fety e tra-low volta e circ its
2.1.9
isolate l mite s con ary circ it
circ it f rom an isolated secon ary win in of a tran f ormer havin a maximum ca acity of
10 VA an an o en-circ it secon ary voltage ratin not ex e din 1 0 0 V
rate impuls volta e
impulse with tan voltage as ig ed by the man f acturer to the eq ipment or to a p rt of it,
c aracterizin the sp cif ied with tan ca a i ty of its in ulation again t overvoltages
2.1.13
ov rvolta e c te ory
n meral c aracterizin a tra sie t ov rvolta e con ition
Note 1 to e try: Ov rv lta e c te orie I I I , a d IV are u e Se An e L
2.1.14
e p s d-cond ctive-part
con u tive p rt of eq ipment, whic can b tou hed an whic is not normal y l ve, but whic
can b come l ve when ba ic ins lation f ai s
Note 1 to e try: A c n u tiv p rt of a co trol whic c n o ly b c me lv thro g c nta t with a ex os
d-co d ctive-part whic h s b c me lv , is n t c n id re to b a ex os d-co d ctive-part its lf
[SOURCE: IEC 6 0 0-19 :19 8, 19 -0 -10, modified – Note 1 to entry has b en ad ed
2.1.15
(condu tiv ) s re n
(condu tiv ) s ield (US)
con u tive p rt that en loses or se arates electric circ its an /or con u tors
[SOURCE: IEC 6 0 0-19 :19 8, Amen ment 1:2 01, 19 -0 -3 ]
Trang 21© IEC 2 15
2.1.16
(ele tric l y) prote tiv s re n
(ele tric l y) prote tiv s ield (US)
conductiv s re n u ed to se arate an electric circ it an /or con u tors f om hazardou
-l ve-p rts
[SOURCE: IEC 6 0 0-19 :19 8, Amen ment 1:2 01, 19 -0 -17]
2.1.17
(ele tric l y) prote tiv s re ning
(ele tric l y) prote tiv s ieldin (US)
se aration of electric circ its an /or con u tors fom hazardous l v parts by an ele tric l y
prote tive s re n con ected to the protective e uipote tial bon ing s stem an inten ed
to provide protection again t electric s oc
(ele tric l y) prote tiv s paration
se aration of one electric circ it f rom another by me n o
– double ins lation, or
– ba ic ins lation an ele tric l y prote tiv scre ning (s ielding), or
– reinforc d ins lation
ele tric l control
device u ed in, on or in as ociation with an eq ipment f or the purp se of varyin or modifyin
the output f rom s c eq ipment, an whic emb dies the asp cts of initiation, tra smis ion
Trang 22Note 2 to e try: At le st o e of th s a p cts s al b ele tric l or ele tro ic.
2.2.2
ma ual control
control in whic the initiation is by a tuation an in whic the tra smis ion an the
operation are b th direct an without an intentional time delay
a tomatic control in whic initiation is by an element sen itive to the p rtic lar a tiv ting
qu ntity declared, f or example, temp rature, c r ent, h midity, l g t, lq id level, p sition,
pres ure or velocity
2.2.5
thermal y operate control
a tomatic control in whic the tra smis ion is by a thermal prime mover
2.2.6
thermostat
c cl n temp rature s nsing control whic is inten ed to ke p a temp rature b twe n two
p rtic lar values u der normal o eratin con ition an whic may have provision f or s t ing
by th us r
2.2.7
temperature l miter
temp rature s nsing control whic is inten ed to ke p a temp rature b low or a ove one
p rtic lar value d rin normal o eratin con ition an whic may have provision f or s t ing
temp rature s nsin control intended to ke p a temp rature b low or a ove one p rtic lar
value d rin a normal o eratin con ition an whic has no provision f or s t in by the
us r
Note 1 to e try: A thermal cuto t ma b of th a tomatic or of th ma u l re et ty e
Note 2 to e try: Normaly a thermal cuto t wi pro id a ty e 2 a tio
Void2.2.9
time-ba e control
automated control in whic the tra smis ion is eff ected by a time-b sed prime mov r or a
time-b sed electrical circ it
Trang 23© IEC 2 15
2.2.12
ele tric l y operate control
a tomatic control in whic the tra smis ion is eff ected by an electrical prime mov r an in
whic the operation controls an electric circ it, an is without intentional sig ificant
time-delay
Note 1 to e try: An e ample is a rela
Note 2 to e try: A slu g d-ela ma b eith r a ele tric ly o erated co trol, or a time-ba ed co trol b
a re me t b twe n te tin a th rity a d ma ufa turer
2.2.13
timer
time-ba e control whic req ires a tuation b fore the next c cle can take place
Note 1 to e try: Durin a c cle, it ma re uire a e tern l ele tric l or me h nic l sig al b f ore mo in fom a
re t p sitio to alow th c cle to c ntin e An e ample is a pro rammer
motor prote tor
a tomatic control that is sp cifical y inten ed to protect the win in s of an electric motor
f rom overhe tin
2.2.16
thermal motor prote tor
a tomatic control bui t-in or on a motor, that is sp cifical y inten ed to protect the motor
again t overhe tin d e to ru nin overlo d an fai ure to start
Note 1 to e try: Th co trol c rie motor c re t a d is s n itiv to motor temp rature a d c re t
Note 2 to e try: Th co trol is c p ble of b in re et (eith r ma u ly or a tomatic ly) wh n its temp raturefals
to th re et v lu
2.2.17
ele tric l y operate v lv
a tomatic control in whic the tra smis ion is eff ected by an electrical prime mov r an in
whic the operation controls the flow of a l q id or a gas
2.2.18
ele tric l y operate me ha ism
a tomatic control in whic the tra smis ion is eff ected by an electrical prime mov r in
whic the operation controls a mec anical device
Note 1 to e try: An e ample is a ele tric ly o erate interlo k f or a s in dry r ld
Note 2 to e try: An ele tric motor is n t in lu e inthis d finitio
2.2.19
operating control
control whic starts or reg lates the eq ipment d rin normal o eration
2.2.2
prote tive control
control the operation of whic is inten ed to prevent a hazardou situation d rin a normal
operation of the eq ipment
Trang 24multipurpos control
ele tric l control that can b clas ified an u ed f or more than one purp se
Note 1 to e try: An e ample of a multip rp s co trol is a thermostat th t c n als b u e a a temperature
lmiter
2.2.2
multif unctional control
ele tric l control whic in orp rates more than one f un tion
Note 1 to e try: An e ample of a multif unctio al co trol is th c mbin tio of a thermostat a d a h midistat
2.2.2
control an control sen ors an actuators as a pled to an a plcation or proces es
Definitions relatin to the fun tion of controls 2.3
Note 1 to e try: This in lu e , b t is n t lmite to, th u e of:
a) c mmu ic tio ln s/proto ols;
b) a ditio al h rdware a d/or s ftware;
that action of an a tomatic control in whic the tra smis ion an operation are prod ced
by initiation whic is not the res lt of a tuation
2.3.5
slow-ma e slow-bre k a tomatic a tion
mode of operation where the rate of contact make an /or bre k is directly pro ortional to the
rate of c an e of the a tiv ting qua tity, or to the sp ed of movement of a prime mov r
Note 1 to e try: This a tio ma b a plc ble to eith r th ma e, or th bre k, or b th
2.3.6
ma ual a tion
that action of an a tomatic control or of a ma u l control in whic the tra smis ion an
operation are prod ced by initiation whic is the res lt of a tuation
Trang 25interme iate position
an p sition of an a tuating member whic is adjacent to a loc te position, an in whic
the a tu tin member wi remain an in whic the operation of the control is intermediate
d ration of time, or the diff eren e of time, b tween an two fu ction , electrical or
mec anical, oc ur in d rin the a tomatic a tion of a time-ba e control
2.3.13
operating s que c
inten ed seq en e, order or p t ern in whic the operation of the electrical or mec anical
f un tion of a control are intended to oc ur as a res lt of either an a tomatic or a ma ual
a tion of a control
Note 1 to e try: It in lu e th p tern of o e e or clo e c nta ts in a y loc ted p sitio , intermediate
p sitio or p sitio of s tin b the eq ipment man f acturer or s tin b the us r
a tomatic a tion, with a reset a tuating member, in whic the a tomatic a tion is
in e en ent of manipulation or p sition of the reset mec anism
2.3.16
le k ge c r e t
al c r ents, in lu in ca acitively coupled c r ents, whic may b con eyed b twe n
exp sed con u tive s races of a device an e rth or other exp sed con u tive s rf aces of a
Trang 26s t ing by the control ma uf acturer
an s t ing car ied out by the control ma ufa turer whic is not inten ed to b altered by
the e uipme t ma ufa turer, the instal er or the u er
an s t ing car ied out by the instal er, as in tru ted by the e uipme t ma uf acturer or the
control ma ufa turer, an whic is not inten ed to b altered by the us r
c cle of conta t operation
one contact make an one s bseq ent contact bre k action, or one contact bre k an one
s bseq ent contact make action
2.3.2
operating dif fere tial
dif feren e b twe n the up er an lower values of the o eratin v lu
2.3.2
a justable dif fere tial
a i ty to c an e or alter the operatin dif fere tial within rated l mits by operation of a
man al y actuated mec anism
Trang 27declared maximum contin ou ambient temp rature to whic the switc he d is inten ed to
b exp sed d rin normal operation
2.3.31
remotely a tuate control function
fu ction providin an o eration by control devices throu h external me n
Note 1 to e try: This in lu e , b t is n t lmite to, th u e of:
a) c mmu ic tio ln s/proto ols;
b) a ditio al h rdware a d/or s ftware;
c) IR/RF transmis io ; or
al c mbin tio s of a) to c) via Intern t u in , for e ample,mo ems, p rta le tele h n s, etc
2.3.3
s fety s ut down
c an e in the state of al electrical outputs so that al saf ety critical electrical outputs of the
control wi proce d to a saf e con ition in lu in s ut-down
Definitions relatin to dis onne tion a d inter uption2.4
Some controls may in orp rate more than one form of circ it dis on ection or inter uption
2.4.1
al -pole dis onn ction
for sin le-phase a.c a pl an es an f or d.c a plan es, dis on ection of b th s p ly
con u tors by a sin le switc in action or, for a plan es to b con ected to more than two
s p ly con u tors, dis on ection of al s p ly con u tors, ex e t the e rthed (grou ded)
con u tor, by a sin le switc in action
Note 1 to e try: Th prote tiv e rthin c n u tor is n t c n id re to b as p ly c n u tor
2.4.2
ful dis onne tion
contact se aration in al s p ly p les other than e rth so as to provide the eq ivalent of ba ic
in ulation b twe n the s p ly main an those p rts inten ed to b dis on ected
Note 1 to e try: Th re are ele tric stre gth a d dime sio al re uireme ts
Note 2 to e try: Wh re th n mb r of p le o th co trol is e u l to th n mb r of s p ly p le of th a pla c
to whic it is c n e te , f ul dis o ne tio pro id s al-p le dis o ne tio
Note 3 to e try: Se als An e H
2.4.3
micro-dis onne tion
adeq ate contact se aration in at le st one p le so as to provide fu ctional sec rity
Note 1 to e try: Th re is a re uireme t for th ele tric stre gth of th c nta t g p b t n dime sio al
re uireme t
Note 2 to e try: Micro-dis o ne tio d n te th t for n n-s nsin co trols th f un tio c ntrole b th
dis o n ctio is s c re, a d th t for s nsin co trols is s c re b twe n th lmits of a tivatin q antity
d clare in re uireme t 3 of Ta le 1
Note 3 to e try: Se als An e H
Trang 28micro-inter uption
inter uption of a circ it by contact se aration, by a c cl n action or by a non-c cl n action
whic do s not provide ful dis onn ction or micro-dis onn ction
Note 1 to e try: Th re are n ele tric stre gth or dime sio al re uireme ts for th c nta t g p
inte rate control
control whic is de en ent on its cor ect mou tin an f i in in an eq ipment, an whic can
only b tested in combination with the relevant p rts of the eq ipment
Note 1 to e try: Th e uipme t ma u e ele tricity, g s, oi s ld f uel or a c mbin tio th re f
Note 2 to e try: Integrated co trol als d n te a co trol whic is p rt of a more c mple co trol (ele tric l or
n n-ele tric l)
2.5.2
in orporate control
control inten ed f or in orp ration in, or on, an eq ipment, but whic can b tested se arately
Note 1 to e try: Th f act th t a incorp rated co trol c n b te te s p rately d e n t imply th t it ma n t b
te te in a e uipme t a s e ifie in 4.3.1.1
Note 2 to e try: Th e uipme t ma u e ele tricity, g s, oi s ld f uel or a c mbin tio th re f
Note 3 to e try: Incorp rated co trol als d n te a co trol inte d d for in orp ratio in or o a more c mple
co trol (ele tric l or n n-ele tric l)
2.5.3
in-l ne cord control
se arately cased control inten ed to b con ected to the s p ly an to the eq ipment by
me n of flexible cord , eq ipment inlets or soc et-outlets, an is inten ed to b man al y
actuated
Note 1 to e try: A f us in th plu is n t re ard d a a p rt of th co trol
2.5.4
fre -sta ding control
in-l ne cord control inten ed to stan on a ta le or on the flo r
Note 1 to e try: It ma b a tu te b h n , b f oot or b oth r simiar h ma a tivity
2.5.5
in epe de tly mou te control
control inten ed for p rmanent con ection to fix d wirin , but inten ed to b mou ted away
fom the control ed eq ipment
Note 1 to e try: It ma b eith r:
– for s ra e mo ntin s c a o to a wal
Trang 29© IEC 2 15
– for f l s mo ntin , s c a into a wal c vity, wh n in talatio s al b p s ible f rom th f ro t;
– for p n l mo ntin , s c a o to or into a co trol p n l wh n in talatio ma b f rom th re r
2.5.6
pul -cord a tu te control
control inten ed to b mou ted in, or on, an eq ipment an actuated by me n of a
pul -cord
2.5.7 to 2.5.10 Se An ex H
2.5.1
two-step a tuation
seq ential p rf orman e of two distin t movements of the a tuating member
Definitions of type of a tomatic a tion of a control a cording to te t proc dure 2.6
2.6.1
type 1 a tion
a tomatic a tion for whic the ma ufa turing d viation an the drif of its operatin
v lue, operating time or o eratin s q e c have not b en declared an tested u der this
stan ard
Note 1 to e try: A ty e 1 a tio is s b la sifie a s e ifie in 6.4
2.6.2
type 2 a tion
a tomatic a tion for whic the ma ufa turing d viation an the drif of its operatin
v lue, o erating time or operating s que c have b en declared an tested u der this
stan ard
Note 1 to e try: A ty e 2 a tio is s b la sifie a s e ifie in 6.4
Definitions relatin to prote tion a ainst ele tric s oc2.7
control in whic protection again t electric s oc reles up n ba ic ins lation
Note 1 to e try: This imple th t th re are n me n f or th c n e tio of a c s ible c n u tiv p rts, if a y, to
th prote tive co d ctor in th f i ed wirin of th in talatio ; rela c in th e e t of a f aiure of th ba ic
insulatio is pla e u o th en iro ment
Note 2 to e try: In Au tria, Belgium, De mark, Fra c , Germa y, Italy, Norwa , a d th Unite Kin d m cla s 0
co trols are n t alowe
Note 3 to e try: An e rthin termin l is o ly alowe if it is for c ntin ity or f un tio al (a distin t f rom prote tiv )
p rp s s
2.7.3
cla s 0I control
in-l ne cord control havin at le st ba ic ins lation throu hout an provided with an
e rthin terminal but with a non-deta h ble cord without e rthin con u tor, an a plu
without e rthin contact whic can ot b introdu ed into a soc et-outlet with e rthin contact
Trang 30co trols are n t alowe
Note 2 to e try: An e rthin termin l is o ly alowe if it is f or c ntin ity (a distin t f rom prote tiv ) p rp s s
2.7.4
cla s I control
control in whic protection again t s oc do s not rely on ba ic in ulation only, but whic
in lu es an ad itional safety precaution in s c a way that me n are provided f or the
con ection of ac es ible con u tive p rts to the protective (e rthin ) con u tor in the fix d
wiring of the in tal ation in s c a way that ac es ible con u tive p rts can ot b come lve in
the event of a fai ure of the ba ic ins lation
Note 1 to e try: This pro isio in lu e a prote tive co d ctor a p rt of th f l xible c rd or c ble Wh n cla s I
co trols are f ite with a two-c re f l xible c rd or c ble; pro id d th t it is f ite with a plu whic c n ot b
intro u e into a s c et-o tlet with e rthin c nta t, th prote tio is th n e uiv le t to th t of cla s 0, b t th
e rthin pro isio s of th e uipme t in al oth r re p cts s o ld fuly c mply with th re uireme ts of cla s I
Note 2 to e try: Cla s I co trols ma h v p rts with d u le insulatio or p rts th t pro id prote tio a ain t
ele tric s o k b S LV or P LV
2.7.5
cla s I control
control in whic protection again t electric s oc do s not rely on ba ic ins lation only, but
in whic ad itional protective precaution , s c as double ins lation or reinf orc d
in ulation, are provided, there b in no provision for protective e rthin or relan e up n
in talation con ition
Note 1 to e try: Su h a co trol ma b o e of th ty e d f i e in 2.7.5.1 to 2.7.5.3
Note 2 to e try: Cla s I co trols ma h v p rts th t pro id prote tio a ain t ele tric s o k b u e of S LV
Note 3 to e try: Cla s I co trols c n ot h v p rts th t pro id prote tio a ain t ele tric s o k b u e of
P LV, a s c circ its re uire c n e tio to a e rthin termin l
2.7.5.1
ins lation-e c s d cla s I control
control havin a d ra le an s bstantial y contin ou en los re of in ulation material whic
en elo es al metal p rts, with the ex e tion of smal p rts, s c as name plates, s rews an
rivets, whic are isolated f om l v parts by in ulation at le st eq ivalent to reinf orc d
ins lation
2.7.5.2
metal-e c s d cla s I control
control havin a s bstantial y contin ou metal en los re in whic double ins lation is u ed
throu hout, ex e t f or those p rts where reinf orc d ins lation is u ed, b cau e the
a plcation of double in ulation is manif estly impractica le
2.7.5.3
combination ins lation-e c s d/metal-e c s d cla s I control
control whic is a combination of the typ s des rib d in 2.7.5.1 an 2.7.5.2
Note 1 to e try: Th e clo ure of a al-in ulate cla s I co trol ma form a p rt or th wh le of th
su plementary insulatio or of th reinf orc d insulatio If a co trol with d u le insulatio a d/or reinf orc d
insulatio thro g o t h s a e rthin termin l or e rthin c nta t, it is d eme to b of cla s 0I or cla s I
Trang 31© IEC 2 15
– whic f or s p ly are only con ected to a SELV s stem or a PELV s stem, to form p rt of
that s stem;
– where internal circ its do not o erate at a hig er level than ELV;
– where in case of a sin le f ault within the control no ste dy state tou h voltage may
a p ar or b generated ex e din ELV level; an
– not provided with a me n of con ection for a prote tiv condu tor
2.7.7
deta hable part
p rt whic can b removed or o ened without the aid of a tool an whic do s not comply
with the test of 1 1 1.5
2.7.8
a c s ible part or a c s ible s rf ac
p rt or s rf ace whic can b tou hed by the test f i ger of Fig re 2, when the control is
mou ted as in normal us , an af ter deta h ble parts have b en removed
2.7.9
f unctional ins lation
in ulation b twe n l v parts whic have a p tential dif feren e b twe n them, an whic
in ulation is neces ary for the cor ect o eration of the control or control ed eq ipment (L-L)
Note 1 to e try: In 2.7.9 thro g 2.7.12, th folowin a bre iatio s are u e :
in ulation a pled to l v parts to provide b sic protection again t electric s oc (L-A or L-I)
Note 1 to e try: Ba ic insulatio in lu e in ulatio b twe n lve parts a d:
– interme iate c n u tiv p rts or metal f oi o er interme iate in ulatin s ra e (cla s I situ tio );
– a c s ible c n u tiv p rts (cla s 0, 0I I situ tio s);
– c n u tiv p rts c n e te to a c s ible c n u tiv p rts (cla s 0, 0I I situ tio s);
– metal foi o er a c s ible in ulatin s ra e (cla s 0 situ tio )
Note 2 to e try: This wa formerly p rt of th t in ulatio refere to a f unctio al insulatio
2.7.1
s ppleme tary ins lation
in e en ent in ulation a pl ed in ad ition to ba ic ins lation in order to provide protection
again t electric s oc in the event of a f ai ure of ba ic ins lation (I-A)
Note 1 to e try: It in lu e in ulatio b twe n interme iate c n u tiv p rts, or metal foi o er interme iate
in ulatin s ra e a d:
– a c s ible c n u tiv p rts (cla s I situ tio );
– c n u tiv p rts c n e te to a c s ible c n u tiv p rts (cla s I situ tio );
– metal f oi o er a c s ible in ulatin s ra e (cla s I situ tio )
2.7.12
reinforc d ins lation
sin le in ulation s stem a pl ed to l v parts, whic provides a degre of protection again t
electric s oc eq ivalent to double ins lation u der the con ition sp cified in this stan ard
(L-(I)-A)
Note 1 to e try: It in lu e in ulatio b twe n lve parts a d:
Trang 32– c n u tiv p rts c n e te to a c s ible c n u tiv p rts (cla s I situ tio );
– metal f oi o er a c s ible in ulatin s ra e (cla s I situ tio )
Note 2 to e try: Th term "in ulatio s stem" d e n t imply th t th in ulatio mu t b o e h mo e e u pie e
It ma c mpris s v ral la ers whic c n ot b te te sin ly a su plementary insulatio or ba ic insulatio
E uip tential b n in is u e to c n e t a y c n u tiv p rt of a b idin n t formin p rt of th ele tric l
in talatio a d la le to intro u e a ele tric l p te tial g n raly th ele tric p te tial of th lo al e rth
(e tra e u -c n u tiv p rt) a d a y c n u tiv p rt of co trols or e uipme t or c mp n nts in th in talatio
whic c n b to c e a d whic is n t n rmaly lv b t whic c n b c me lv wh n ba ic insulatio fais
(ex os d-co d ctive-part to a main eq ip tential b n in terminal in th f orm of a b r, in ord r to brin th s
p rts to th s me p te tial Parts to b c n e te to th eq ip tential b n in system in lu e, for e ample,
prote tive co d ctors, P c n u tors, PEN c n u tors, e rthin c n u tors, prote tiv e rthin termin ls of
co trols or e uipme t, al c n u tiv p rts in a b idin , f or e ample, metal tu in for water (drin in a d wa te),
metal c b thtu s, th c ntral h atin s stem pipin , a y intern l g s tu in (whic is als re uire to b is late
f rom e tern l g s tu in ), e rth c n e tors for a te n s a d tele ommu ic tio s stems, al metal p rts of th
b idin u e for c n tru tio lk mats a d iro , a d c n u tors f or lg tnin prote tio a d d p n in o th
in talatio s stem, th e rth ele tro e Re uireme ts for eq ip tential b n in c n b f ou d in th IEC
sta d rd for th in talatio of b idin s Th s ma b rele a t f or th in talatio of co trols whic c n ist of
s v ral c mp n nt-p rts (f or e ample, s n ors, a tors, c ntral co trol eleme t, intera e eleme ts) c n e te in
p ralel to or via th fix d in talatio of th b idin
[SOURCE: IEC 6 0 0-19 :19 8, 19 -01-10]
2.7.15.1
prote tive-e uipote tial-b nding
e uipote tial b nding f or purp ses of safety (protection again t electric s oc )
Note 1 to e try: Fu ctio al eq ip tential b n in is d fin d in [IEV 19 -01 16]
[SOURCE: IEC 6 0 0-19 :19 8, 19 -01-15, modified – (protection again t electric s oc ) has
that p rt of the control whic is inten ed to b exp sed to the influen es of the a tiv ting
qu ntity to whic the a tomatic a tion of a s nsin control resp n s
2.8.2
switc he d
complete control ex e t f or any s nsing eleme t
Note 1 to e try: If b c n tru tio it is imp s ible to distin uis b twe n th switch he d a d th s nsin
element, th n th wh le co trol is c n id re to b th s nsin element
Trang 33Note 1 to e try: Th term "a tuatin member" d e n t in lu e a y d vic s c a a s t-s rew u e f or s tin
b the co trol man f acturer if s c a d vic is a e u tely lo k d a ain t furth r mo eme t, or if a to l is
re uire f or s c s t in b the co trol man f acturer
an device u ed to prod ce the mec anical energ req ired to provide the tra smis ion f or
an a tomatic control s c as an ele tric l y operate control an ele tric l y operate
v lv , an ele tric l y operate me h nism or a time-ba e control
Note 1 to e try: It ma b a me h nic l stora e d vic (or e ample, a clo kwork s rin ), a ele tro-ma n tic
d vic (f or e ample, a ele tric motor, or ste pin s le oid), a ele tro-th rmal d vic (or e ample, th h atin
eleme t of a energ reg lator) or a y oth r me h nism pro u in me h nic l e erg
2.8.7
clutc
mec anical device by whic an a tuating member can over ide either a prime mov r or an
a tiv ting qua tity, cau in or al owin the initiation or can el ation of an action
2.8.8
cov r
cov r plate
p rt whic is ac es ible when the control is mou ted as in normal us an whic can b
removed only with the aid of a tool
Note 1 to e try: It s al n t re uire th u e of a spe ial p rp s to l f or its remo al
2.8.9
s rewle s fix d part (or compon nt)
a c s ible part (or comp nent whic , af ter at ac ment, in talation, mou tin or as embly
into or onto an eq ipment or another comp nent, or to a sp cial y pre ared s p ort, is
retained in p sition by p sitive me n whic do not de en on s rews
Note 1 to e try: Dis s embly or remo al ma re uire th u e of a to l, eith r a ple dire tly to th p rt (or
c mp n nt), or to o tain a c s to th retainin me n
Note 2 to e try: Th f olowin are s me e ample of p rts whic are n t re ard d a s rewle s f i ed parts or
comp nents:
– p rts of c mp n nts f i e p rma e tly b riv ts, glu in or simiar me n ;
– flat, p s -o c n e tors;
– s rewle s terminals;
– sta d rd plu s a d s c et-o tlets;
– sta d rd a pla c c u lers, e e if s c h v a ditio al latc in d vic s to pre e t a sin le a tio
u c u ln ;
– th re la eme t of a lamp in a b y n t ty e lamp old r;
– twist-lu c n tru tio ;
– f rictio -f it c n tru tio
Trang 34Definitions of type of terminals a d terminations of controls 2.9
2.9.1
pi ar terminal
terminal in whic the con u tor is in erted into a hole or cavity, where it is clamp d u der the
s an of the s rew or s rews
Note 1 to e try: Th clampin pre s re ma b a ple dire tly b th s a k of th s rew, or thro g a
interme iate clampin memb r to whic pre s re is a ple b th s a k of th s rew (s e Fig re 1 )
2.9.2
s rew termin l
terminal in whic the con u tor is clamp d u der the he d of the s rew
Note 1 to e try: Th clampin pre s re ma b a ple dire tly b th h a of th s rew, or thro g a
interme iate p rt, s c a a wa h r, a clampin plate or a a ti-s re d d vic (s e Fig re 10)
2.9.3
stud terminal
terminal in whic the con u tor is clamp d u der a n t
Note 1 to e try: Th clampin pre s re ma b a ple dire tly b a s ita ly s a e n t, or thro g a
interme iate p rt, s c a a wa h r, a clampin plate or a a ti-s re d d vic (s e Fig re 10)
2.9.4
s rewle s terminal
terminal in whic the con ection of the con u tor is ac ieved directly or in irectly by me n of
sprin s, wed es, ec entric , cones or the l ke
Note 1 to e try: Th f olowin are n t re ard d a s rewle s terminals:
– termin ls re uirin th f i in of s e ial d vic s to th c n u tors b f ore clampin th m in th termin l for
e ample, f lat p sh-o co ne tors;
– termin ls re uirin wra pin of th c n u tors, f or e ample, th s with wra p d joints;
– termin ls pro idin dire t c nta t to th c n u tors b me n of e g s or p ints p n tratin th in ulatio
2.9.5
flat pus -on conne tor
as embly of a tab an a re epta le ena ln the con ection, at wi , of a core or con u tor to
a control or to another core or con u tor
2.9.6
re epta le
f emale p rt of a f lat pus -on con e tor inten ed to b p rmanently atac ed to a core or
con u tor (se Fig re 16)
tab f orming part of a control
tab p rmanently at ac ed to, or an integral p rt o a control
Trang 35© IEC 2 15
2.9.10
termination
p rt by whic a con u tor can b con ected to a control in s c a way that its re lacement
req ires either a spe ial purpos tool a sp cial proces or a sp cial y pre ared en of the
con u tor
Note 1 to e try: Sold rin re uire a spe ial p rp s to l Weldin re uire a s e ial pro e s A c ble lu
ata h d to a c n u tor is a s e ialy pre are e d
2.9.1
solder termination
termination in whic the con u tor is sec red by a mec anical me n , an the circ it
contin ity is as ured by solder
Note 1 to e try: Th c n u tor is clamp d a ain t th b s of th slot b a s ita ly s a e wa h r u d r th n t,
b a c ntral p g if th n t is a c p n t or e u ly ef f ectiv me n f or tra smitin th pre s re fom th n t to th
c n u tor within th slot (s e Fig re12)
2.9.15
e uipote tial b nding terminal
terminal provided on eq ipment or on a device an inten ed for the electric con ection with
the e uipote tial bonding s stem
[SOURCE: IEC 6 0 0-19 :19 8, 19 -0 -3 ]
2.9.16
prote tive bon ing terminal
terminal inten ed for prote tiv e uipote tial bonding purp ses
Note 1 to e try: Ex mple are a prote tiv s re n- or P -termin l of a co trol or e uipme t
e tern l conductor
an ca le, flexible cord, core or con u tor, a p rt of whic is external to an in-l n cord
control an in epe d ntly mounte control or to an eq ipment in or on whic a control is
Trang 36p rts of a e uipme t; or it ma f orm p rt of th f i ed wirin
2.10.2
fix d wirin
an e ternal cond ctor whic is p rmanently sec red to the f abric of the bui din s c that,
in normal us at the p int at whic the con u tor enters the eq ipment or control there is no
l kel ho d of any strain b in a pled to the con u tor
Note 1 to e try: Su h s c rin to th fa ric of th b idin ma b , for e ample, b th e clo in of c n u tors in
c n uit, b ryin c ble in wals, a e u tely f i in c ble or c rd to wals or oth r s rf ac s, etc
2.10.3
internal condu tor
an ca le, flexible cord, core or con u tor whic is neither an e tern l cond ctor, nor an
inte rate con uctor
Note 1 to e try: An e ample is a c n u tor in id th e uipme t to interc n e t th co trol a d th e uipme t
2.10.4
inte rate con uctor
con u tor whic is in ide a control or is u ed to p rmanently intercon ect terminals or
terminations of a control
2.10.5
deta hable cord
f lexible external cord con ected to a control or eq ipment by me n of an eq ipment inlet, or
method of atac ment s c that the cord can b e siy re laced without spe ial-purpos
tools, u in standard cord without an sp cial pre aration
2.10.6.2
type M at a hme t
method of at ac ment s c that the cord can b e si y re laced without spe ial purpos
tools, but is inten ed to u e only a sp cial cord, s c as one with a moulded-on cord g ard,
or one with sp cial pre ared en s
Note 1 to e try: This ata hme t meth d d e n t a ply if it is p s ible to f it a sta d rd c rd d rin s rvicin
u le s s c is p rmite b a p rtic lar e uipme t sta d rd
2.10.6.3
type Y at a hme t
method of at ac ment of the s p ly cord s c that an re lacement is inten ed to b made by
the man facturer, its service agent or a simi ar q alfied p rson
2.10.6.4
type Z at a hme t
method of at ac ment s c that the flexible ca le or cord can ot b re laced without bre kin
or destroyin a p rt of the control
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2.10.7
f lyin le d
pigtai
wire or wires inten ed for the con ection of the control with one en p rmanently con ected
to the control by the control ma ufa turer
an kin of electroc emical c l in whic the electroc emical re ction of interest is reversible
Note 1 to e try: A re h rg a le b tery is a gro pof two or more s c n ary c ls
Note 2 to e try: Ex mple of e h rg a le b terie are nic el metal h drid (NiMH), lthium io (Li-io ) etc
Definitions relatin to the perf orma c of type 2 a tions 2.1
2.1 1
ma uf acturing de iation
maximum diff eren e of operating v lue, o erating time or operating s que c whic is
claimed b twe n an two controls, s p l ed by the man f acturer to a unique type refere c ,
when tested as s bmited an in the same man er
Note 1 to e try: Th dif fere c ma b relate to a a s lute v lu if p rmite b th a pro riate s b la s of
Cla s 15
2.1 2
drif t
maximum alteration of operating v lu , operatin time or o erating s q e c of an one
sample whic can oc ur when it is tested u der the con ition sp cified in this stan ard
Note 1 to e try: Th alteratio ma b relate to a a s lute v lu , or c mbin d with th man f acturin
deviatio , if p rmite b th a pro riate s b la s of Cla s 15
Definitions relatin to the re uireme ts f or cre pa e dista c s a d cle ra c s 2.12
2.12.1
cle ra c
s ortest distan e throu h air b twe n two con u tive p rts, or b twe n a con u tive p rt an
a metal foi in contact with a s rf ace of in ulatin material
Note 1 to e try: Th meth d of me s reme t is d taie inAn e B a d Fig re 17
2.12.2
cre pa e dista c
s ortest distan e alon the s rf ace of the in ulatin material b twe n two con u tive p rts, or
b twe n a con u tive p rt an a metal f oi in contact with an a c s ible s rfa e of
in ulatin material
Note 1 to e try: Th meth d of me s reme t is d taie inAn e B a d Fig re 17
Trang 38Void2.12.4
Void2.12.5
Void2.12.6
Void2.12.7
2.12.8
pol ution
an ad ition of foreig mater, sol d, l q id, or gase u that can res lt in a red ction of electric
stren th or s rf ace resistivity of the in ulation
En ironme t 2.12.9
n meral c aracterizin the exp cted pol ution of the micro-e vironme t
Note 1 to e try: P lutio degre s 1, 2, 3, a d 4 are u e Se An e N
Mis el a eous d f initions 2.13
2.13.1
unique type refere c
markin s c that by q otin it in f ul to the man facturer of the control a re lacement can
b s p l ed whic wi b ful y interc an e ble with the original, electrical y, mec anical y,
spe ial-purpos tool
to l whic is u lkely to b re di y avai a le in a normal hou ehold, for example, a key f or a
hexagonal soc et-he ded s rew
Note 1 to e try: T ols s c a c in , s rewdriv rs a d s a n rs inte d d to o erate s u re, or h x g n l n ts,
are n t spe ial-p rp s to ls
2.13.4
normal us
u e of the control or its as ociated eq ipment, for the purp se f or whic it was made, an in
the man er inten ed by the man facturer
Note 1 to e try: Normal us in lu e a y o erlo d, or a n rmal o eratin c n itio s s e if i d in th e uipme t
sta d rd
Trang 39© IEC 2 15
Note 2 to e try: Normal us d e n t in lu e a y pro e s whic is n c s ary to maintain th co trol or
e uipme t in g o ord r, e e th u h this ma b c rie o t b th us r a c rdin to th ma uf acturer's
in tru tio s
2.13.5
us r mainte a c
an p riodic proces neces ary to maintain the control or eq ipment, in go d order, for
whic detais are given in the man f acturer's in tru tion to the us r
2.13.6
s rvicing
an proces neces ary to maintain a control or eq ipment, in go d order, that would b done
by a comp tent p rson, s c as in a work hop, by an electrician or by a service organization
Note 1 to e try: This in lu e re la in a fle ible c rd, th rmal ln or th lk
2.13.7
ma uf acturer s rvicing
s rvicing whic can only b done by the man facturer, or his ac redited serviceman
Note 1 to e try: This ma b d e to th n e for spe ial p rp s to ls, or s e ial in trume tatio , a d in lu e
th s tin b the co trol man f acturer
state of an item c aracterised by its ina i ty to p rf orm a req ired fu ction, ex lu in the
ina i ty d rin preventive maintenan e or other plan ed action , or d e to lac of external
resources
Note 1 toe try: ”Faiure“ is a e e t, a distin uis e f rom ”f ault, whic is a state
Note 2 toe try: After faiure, th item h s a f ault
Note 3 toe try: This c n e t a d f i e d e n t a ply to items c n istin of s ftware o ly
Note 4 toe try: A f ault is of te th re ult of a f aiure of th item its lf , b t ma e ist with ut prior f aiure
[SOURCE: IEC 6 0 0-191:19 0, 191-0 -01]
Trang 40Definitions relatin to ma uf acturer a d us r 2.14
2.14.1
control ma ufa turer
man facturer of the control
2.14.2
e uipme t ma uf acturer
man facturer of eq ipment in whic , on whic , or together with whic the control is u ed
Note 1 to e try: In Ca a a a d th USA, th eq ipment man fa turer is in ic te a th OEM (origin l
eq ipment man f acturer) Th OEM re eiv s co trols fom co trol man fa turers f or inte ratio or
in orp ratio into e uipme t
low comple ity s fety-relate s stems or controls
safety related s stem or control in whic
– the fai ure modes of e c in ivid al comp nent are wel def i ed;
– the b haviour of the s stem or control u der f ault con ition can b completely