Iec 62841 3 4 2016

Elect ric motor- operat ed hand- held tools, t ransportable t ools and law n and garden machinery – Safety – Part 3- 4: Particular requirements for t ransport able bench grinders Outi s

Elect ric motor- operat ed hand- held tools, t ransportable t ools and law n and

garden machinery – Safety –

Part 3- 4: Particular requirements for t ransport able bench grinders

Outi s élect roport atifs à mot eur, outi s port ables et machines pour jardins et

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Electric mot or- operated hand- held t ools, t ransportable t ools and law n and

garden machinery – Safety –

Part 3- 4: Part icular requirement s for t ransport able bench grinders

Out ils électroport at ifs à mot eur, out ils port ables et machines pour jardins et

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CONTENTS

FOREWORD 4

1 Sco e 6

2 Normative ref eren es 6

3 Terms an def i ition 6

4 General req irements 7

5 General con ition f or the tests 7

6 Radiation, toxicity an simiar hazard 7

7 Clas ifi ation 7

8 Markin an in tru tion 7

9 Protection again t ac es to l ve p rts 9

10 Startin 9

1 Input an c r ent 9

12 He tin 9

13 Resistan e to he t an f ire 9

14 Moisture resistan e 9

15 Resistan e to ru tin 9

16 Overlo d protection of tran f ormers an as ociated circ its 9

17 En uran e 10 18 Abnormal o eration 10 19 Mec anical hazard 10 2 Mec anical stren th 14 21 Con tru tion 16 2 Internal wirin 17 2 Comp nents 17 2 Sup ly con ection an external f lexible ca les an cord 17 2 Terminals f or external con u tors 17 2 Provision f or e rthin 17 2 Screws an con ection 17 2 Cre p ge distan es, cle ran es an distan es throu h in ulation 17 An exes 2

An ex I (informative) Me s rement of noise an vibration emis ion 2

Bibl ogra h 2

Fig re 101 – Ben h grin er 18 Fig re 10 – Op nin an les an dimen ion for a g ard 19 Fig re 10 – Tran p rent s re n 2

Fig re 10 – Ben h grin er with in l na le work rest 2

Fig re 10 – Flan e dimen ion 21

Ta le 4 – Req ired p rforman e levels 10

Ta le 101 – Minimum flan e dimen ion (se Fig re 10 ) 13

Ta le 10 − Test torq e for f lan es 13

INTERNATIONAL ELECTROTECHNICAL COMMISSION

SAFETY –

Part 3-4: Particular requirements f or transportable bench grinders

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

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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 cific tio s (PAS) 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 formal 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

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intere te IEC Natio al Commite s

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misinterpretatio b a y e d u er

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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 r e 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

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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 for 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 ntifyin a y or al s c p te t rig ts

International Stan ard IEC 6 8 1-3-4 has b en pre ared by IEC tec nical commite 1 6:

Saf ety of motor o erated electric to ls

The text of this stan ard is b sed on the fol owin doc ments:

Ful inf ormation on the votin f or the a proval of this stan ard can b f ou d in the re ort on

votin in icated in the a ove ta le

This publcation has b en draf ted in ac ordan e with the ISO/IEC Directives, Part 2

This Part 3-4 is to b u ed in conju ction with the f irst edition of IEC 6 8 1-1:2 14.

This Part 3-4 s p lements or modifies the cor esp n in clau es in IEC 6 8 1-1, so as to

con ert it into the IEC Stan ard: Partic lar req irements f or tran p rta le b n h grin ers

Where a p rtic lar s bclau e of Part 1 is not mentioned in this Part 3-4, that s bclau e

a pl es as f ar as relevant Where this stan ard states “ad ition”, “modif i ation” or

“re lacement , the relevant text in Part 1 is to b ada ted ac ordin ly

The f ol owin print typ s are u ed:

– req irements: in roman typ ;

– test s e ific tio s: in itali ty e;

– n te : insmal roma ty e

The terms def i ed in Clau e 3 are printed in bold typef ac

Subclau es, notes an f i ures whic are ad itional to those in Part 1 are n mb red startin

f rom 101

A lst of al p rts of the IEC 6 8 1 series, u der the general title: Ele tric motor-o erated

h nd -h ld to ls, tra s ortable to ls a d lawn a d g rde ma hin ry – Safety, can b f ou d

on the IEC we site

The commit e has decided that the contents of this publcation 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 cifi publ cation At this date, the publ cation wi b

• recon rmed,

• with rawn,

• re laced by a revised edition, or

• amen ed

NOT Th ate tio of Natio al Commite s is drawn to th fa t th t e uipme t ma ufa turers a d te tin

org niz tio s ma n e a tra sitio al p rio folowin p blc tio of a n w, ame d d or re is d IEC p blc tio in

whic to ma e pro u ts in a c rd n e with th n w re uireme ts a d to e uip th ms lv s f or c n u tin n w or

re is d te ts

It is th re omme d tio of th c mmite th t th c nte t of this p blc tio b a o te for impleme tatio

n tio aly n t e rler th n 3 mo th fom th d te of p blc tio

IMPORTANT – Th 'colour in ide' logo on the cov r pa e of this publ c tion indic te

understa ding of its conte ts Us rs s ould therefore print this doc me t usin a

colour printer

ELECTRIC MOTOR-OPERATED HAND-HELD TOOLS, TRANSPORTABLE

This p rt of IEC 6 8 1 a pl es to tran p rta le be c grin ers that can b eq ip ed with

one or two a c s orie as f ol ows:

– typ 1 grin in whe ls in ac ordan e with ISO 6 3-4:19 9 with a diameter not ex e din

310 mm an a thic nes not ex e din 5 mm;

– wire bru hes with a diameter not ex e din 310 mm an a thic nes not ex e din

5 mm;

– p ls in whe ls with a diameter not ex e din 310 mm;

an with a p ripheral sp ed of an a c s ory b twe n 10 m/s an 5 m/s

NOT Pols in wh els are als k own a b ff i g wh els

This clau e of Part 1 is a pl ca le, ex e t as f ol ows:

Ad ditio :

ISO 6 3-4:19 9, Bo ded a ra iv prod ucts – Dime sio s – P art 4: Grind in wh els for

s ra e grindin /p riph ral grindin

3 Terms and def initions

This clau e of Part 1 is a pl ca le, ex e t as f ol ows:

3.101

be c grinder

to l desig ed to grin , cle n, p l s or de ur metal or simi ar materials by me n of one or

two rotatin a c s orie f i ed to one or two to l spin le , se Fig re 101, where the

workpiece is held by han an p s ibly as isted by a work re t

4 General requirements

This clau e of Part 1 is a pl ca le, ex e t as f ol ows:

4.101 D is u dersto d to b the maximum diameter of the a c s ory to b u ed on e c

tool spindle Unles otherwise sp cif ied, tool spindle sp cif i req irements de en ent on D

s al b b sed on the value of D for the relevant tool spindle

Throu hout the remainin p rt of this doc ment, u les otherwise explcitly stated, whenever

a req irement or a ref eren e is made to “f orce” as multiple of D, the f orce s al b expres ed

in newton (N) an D s al b expres ed in mi imetres (mm)

5 General conditions f or the tests

This clau e of Part 1 is a pl ca le, ex e t as f ol ows:

5.17 Add itio :

Th ma s of the to l s a include the guards, work re ts a d tra s are t s re n An

add ition l p rts s c a leg s ts or c ryin me n that are re uired in a c rd an e with th

instru tio s for the s fe u e of th to l s a b in lud ed in th ma s

6 Ra iation, toxicity and simi ar hazards

To ls s al b marked with the fol owin safety warnin s:

– “ WARNING Alway we r eye protection” or the s mb l M0 4 of ISO 7 10 or the

f olowin safety sig :

– a warnin ne r an p l s in spin le (i.e a spin le without a g ard) never to u e a

grin in whe l or wire bru h on the p l s in side of the to l, if a pl ca le

8.3 Add ition:

Be c grinders s al b marked with the minimum an maximum diameter of the a c s ory

to b u ed on e c tool spin le

Be c grind rs s al b marked with the direction of otation of the tool spin le, in icated in

a visible location on the to l in the vicinity of the tool spindle, by an ar ow raised or reces ed

or by an other me n no les visible an in el ble

8.14.1 Ad ditio :

The ad itional saf ety in tru tion as sp cif ied in 8.14.1.101 s al b given This p rt may b

printed se arately f rom the “General p wer to l saf ety warnin s”

8.14.1.101 Saf ety instructions f or be c grind rs

Be c grind r s f ety warnings

a) Do not us a dama e a c s ory Bef ore e c us , inspe t the a c s ory s c a

abra iv whe ls for c ips a d cra k a d wire brus e f or loos or cra k d wire

Af ter inspe tin a d instal ing a a c s ory, position yours lf a d by ta ders awa

from the pla e of the rotating a c s ory a d run th power tool at ma imum no-loa

spe d for one min te Dama ed a c s orie will n rma y bre k a art durin this test

time

NOT 1 For to ls th t are n t inte d d for wire bru h s, th p ra e “a d wire bru h s for lo s or cra k d

wire ” is omite

b) Th rate spe d of the a c s ory must be at le st e ual to th ma imum spe d

mark d on the p wer tool Ac e s ries ru ning fa ter th n their rated s e d c n bre k

a d fly a art

c) Be aware th t wire bristle are thrown by the wire brus e e during ordinary

operation Do not ov rstre s the wire by applying e c s iv loa to the wire brus

Th wire bristles c n e siy p n trate li ht clothing a d /or s in

NOT 2 Th a o e s fety warnin a ple o ly to to ls inte d d to b u e with wire bru h s

d) Ne er grind on the sid s of a grindin wh el Grind in o the sid e c n c u e the wh el

to bre k a d fly a art

8.14.2 a) Ad ditio :

101) Inf ormation a out detais an typ of the a c s ory(ies) recommen ed f or e c tool

spindle, e.g the maximum thic nes of the a c s ory an the diameter of the hole in

the a c s ory;

10 ) In tru tion to u e only a c s orie with a diameter ac ordin to the relevant markin

as req ired by 8.3;

10 ) In tru tion to en ure that the be c grind r is alway sta le an sec re (e.g f i ed to

a b n h) an in tru tion how to f i the to l to a workb n h or the l ke;

10 ) In tru tion on the cor ect mou tin of whe ls an en urin that whe ls are fre of

defects b fore u e, in lu in in tru tion f or p rformin a rin test for crac s

8.14.2 b) Ad ditio :

101) In tru tion to adju t the sp rk ar estor an the work re t f req ently so as to

comp n ate f or we r of the whe l;

10 ) In tru tion to ke p the distan e b twe n the sp rk ar estor/work re t an the whe l

as smal as p s ible an in an case not gre ter than 2 mm;

10 ) In tru tion to re lace the worn whe l when these ga s are no lon er a le to b

maintained;

10 ) For to ls with two spin les: in tru tion to alway u e the to l with a c s orie on b th

spin les in order to l mit the ris of contact with the rotatin spin le;

10 ) In tru tion to alway u e the guard, work re t, tran p rent s re n an sp rk ar estor

as req ired for the a c s ory(ies);

10 ) For to ls with a vertical y adju ta le or in l na le work re t: in tru tion on how to

pro erly adju t an sec re the work re t an le in relation to the whe l;

10 ) In tru tion on how to p rf orm grin in f un tion saf ely;

10 ) In tru tion to re lace damaged or de ply gro ved whe ls;

10 ) In tru tion where to l f t an s p ort the be c grinder d rin tran p rtation;

1 0) In tru tion to alway adju t the work re t so that the an le b twe n the work re t an

the tan ent of the a c s ory is alway gre ter than 8 °

If the te t of 18.5.3 is a p ed , the to l s a b te ted for a p riod of 5 min.

18.8 Ele tronic circ its providing s f ety critic l f un tions

Re lac me t of Ta le 4 b the fo owing:

Table 4 – Re uire performa c le els

(P )

For to ls inte d d to b u e with grin in wh els or wire bru h s, p wer

switch – pre e t u wa te switc -o

a

For to ls inte d d to b u e with grin in wh els or wire bru h s, p wer

switch – pro id d sire switc -of f

a

For to ls n t inte d d to b u e with grin in wh els or wire bru h s,

p wer switch – pre e t u wa te switc -o

Not a SCF

For to ls n t inte d d to b u e with grin in wh els or wire bru h s,

p wer switch – pro id d sire switc -of

Not a SCF

For to ls inte d d to b u e with grin in wh els, o er s e d pre e tio to

pre e t o tp t s e d a o e 12 % of rated n -load spe d

19 Mecha ical hazards

This clau e of Part 1 is a pl ca le, ex e t as fol ows:

19.1 Re lac me t ofth first p ra ra h:

Movin an dan erou p rts other than the a c s orie s al b so p sitioned or en losed to

provide adeq ate protection again t p rsonal injury The g ardin of a c s orie is covered

in 19.1.101 throu h 19.1.10

For grin in whe ls an wire bru hes, a guard in ac ordan e with 19.1.101 an 19.1.10 , a

work re t in ac ordan e with 19.10 an a tran p rent s re n in ac ordan e with 19.1.10

s al b provided

For p l s in whe ls, a guard, a work re t an a tran p rent s re n are not req ired

Gu rd f or a c s orie s al not b remova le without the aid of a to l

19.1.101 Gu rds

The g ard s al cover the p riphery an the sides of the a c s ory, f lan es an the en of

the to l spindle, ex e t a p rtion of the a c s ory as al owed in 19.1.10 an in icated in

Fig re 10

The guard s al b desig ed so that the tool spindle can ot b f ited with an a c s ory

gre ter than 1,0 times the maximum diameter marked on the to l

The g ard s al b con tru ted so that removal of the p ripheral protectin memb r is not

neces ary for re lacement of the a c s ory

19.1.10 Ope ing in the guard

For grin in whe ls an f or wire bru hes, the o enin an le in the guard s al not ex e d

6 ° a ove the horizontal plane p s in throu h the centre of the whe l The total o enin

The s re n s al b made of tran p rent material havin an a pro riate resistan e again t

s at erin , s c as p ly arb nate or laminated glas whic is held in place by an interlayer,

b twe n its two or more layers of glas

For al be c grinders, the s re n s al b mou ted in s c a way that the s mmetrical axis

of the s re n coin ides with the vertical median plane of the workin p rt of the grin in

whe l or the wire bru h

Comp a c is c e k d b in p ction

19.6 Re lac me t:

The to l s al b desig ed so as to prevent ex es ive sp ed u der normal us The no-lo d

sp ed of the tool spindle at rate volta e s al not ex e d the rate no-loa spe d

Comp a c is c e k d b me s rin the s e d ofthe to l spindle after the to l h s b e

o erating for 5 min at n -load

19.7 Add itio :

If a workin stan is provided with a be c grinder, or is sp cif i al y identif ied in ac ordan e

with 8.14.2, the req irements of 19.7 are also a pl ca le to the combination of the be c

The sp rk ar estor s al b situated at the up er p rt of the whe l g ard in l ne with the

p riphery of the whe l an cover al the width of the whe l guard

The sp rk ar estor s al b adju ta le to within 2 mm of the s rf ace of the whe l f or al whe l

diameters b twe n the maximum whe l diameter an 9 % of the smal est whe l diameter in

ac ordan e with 8.3, se dimen ion E in Figure 10

19.10 Work re t

The work re t s al not exten arou d the side of the whe l an cover at le st the width of

the whe l g ard The work re t s al only b radial y adju ta le to within 2 mm of the

p ripheral s rf ace of the whe l f or al whe l diameters b twe n the maximum whe l diameter

an 9 % of the smal est whe l diameter in ac ordan e with 8.3, se dimen ion F in

Fig re 10

The plane of the work re t s rf ace s al either b f i ed or b ca a le of adju tment only so

as to form an an le of not les than 8 ° to the tan ent of the whe l with the smal est diameter

Be c grinders s al b provided with f lan es f or mou tin grin in whe ls to the tool

spin le Flan es s al comply with the minimum dimen ion in relation to the maximum

diameter D of the whe l, as sp cified in Ta le 101

The f lan es req ired by 19.10 s al b desig ed so that they are of adeq ate stren th

Comp a c is c e k d b the followin te t

Th a ra iv wh el is re lac d b a flat steel plate of s ficient thic n s to b clamp d

b twe n th flan e , h vin the s me b re d iameter of th wh el a d whic ex te ds b y nd

the flan e

Th clampin n t s a b tighte ed with a first test torq e a c rd in to Ta le 10 A fe ler

g u e ofthic n s 0,05 mm s a b u ed to c e k wh th r the flan e are in c ntact with

th plate a aro nd the circ mfere c I s a n t b p s ible to p s the fe ler g u e

b twe n the flan e a d the s ra e of the plate b more th n 1 mm at a y p int aro nd the

circ mfere c of th flan e, ex cludin a y c amfer

Th te t is the re e ted u in th s c nd test torq e a c rd in to Ta le 10

Table 10 − Te t torque for f la ge

19.10 Ec e tricity of th to l spindle a d f la ge

The ec entricity of the tool spin le s al b les than 0,1 mm

For to ls that provide f or mou tin of the ac es ory throu h the f lan e or simiar clampin

an locatin device, the total ec entricity of the combination of the to l spin le, the diameter

of the f lan e b re an the diameter of the p rt of the f lan e whic locates an g ides the

a c s ory s al b les than 0,3 mm

Th e c ntricity of the flan e in th worst of-c ntre p sition allowed b th mo ntin

pro edure is me s red

19.10 Out of bala c

A be c grind r inten ed for u e with grin in whe ls of 10 mm or more in diameter s al

have adeq ate stren th when out of b lan e

A simulated grind in wh el h vin a d iameter e u l to the max imum d iameter mark d o the

tool spindle in a c rda c with 8.3 is mo nted o the tool spindle Th bench grinder is

the to b o erated at n -load for 250 0 0 re olutio s Th simulated wh el ma c n ist ofa

circ lar steel plate Th simulated wh el s to b o t of b la c , b the additio or remo al of

– for wh els of 150 mm or more in diameter, b 14 N mm

After the test, the tool s all with tand the electric stre gth te t of An e D b twe n lve parts

a d a c s ible parts a d lve parts s a n t h v b c me a c s ible a s e ified in

Cla s 9 I n add ition, a g ards s a remain inta t

20 Mecha ical strength

Comp a c is c e k d b in p ctio , b me s reme t a d b either re eipt of c nfirmation

of th ultimate ten ile stre gth of the material fom the material ma ufa turer or thro g

me s reme t of s mples ofthe material

2 10 To l spindle

Tool spin le s al b made of ste l an have s f f icient size to s p ort a c s orie with a

maximum diameter in ac ordan e with 8.3 The diameter of the tool spindle s al comply with

the minimum values sp cif ied in Ta le 10

Table 10 – Minimum tool spindle diameter

Maximum a c s ory diameter Minimum to l spin le diameter

Me n f or tran p rtation of be c grin ers as req ired by 19.4 an as des rib d in the

in tru tion in ac ordan e with 8.14.2 b) 10 ) s al b of adeq ate stren th to safely

tran p rt the to l

Comp a c is c e k d b in p ction a d th followin test

Carying me n other tha gra ping s ra e o motor h u in s are s bje ted to a forc

c rying me n Th forc is a p ed in the dire tio of liftin u iformly o er a 70 mm wid th at

the c ntre of the c ryin me n Th forc is stead ily in re s d s that the test v lu is

attain d within 10 s a d maintain d for a p riod of 1 min

I f more tha o e c ryin me n is pro ided , the forc is d istrib ted b twe n th c r ying

me n in th s me pro ortio a in the n rmal tra s ortatio p sitio If the e uipme t is

pro ided with more th n o e c ryin me n , b t s desig ed that it ma re d ily b c ried b

p rma e t distortio , cra kin or other e ide c of fa ure

A workin stan f or a be c grind r, if provided with the to l or if sp cif i al y identif ied in

ac ordan e with 8.14.2, s al have adeq ate stren th

Th bench grinder is mo nted to the workin sta d a d a addition l v rtic l forc of3 time

th larg st D is grad ually a p ed for 1 min, distrib ted e u ll o the h u ing ofth bench

grinder Durin th test the workin stand s a n t c ll p e, a d after remo in the forc it

For be c grinders, protection devices (e.g overlo d or over temp rature protection

devices) or circ its that switc of f the to l s al b of the non-self-resetin typ

24 Supply connection and external f lexible cables and cords

NOT Th lower p rt of Fig re 10 is b s d o Fig re 3 1 in th Sta d rd for Statio ary a d Fix d Ele tric

To ls, UL 9 7, Editio 8

Ke

2 gu rd for grin in wh el or wire bru h J thic n s of th sid s of th gu rd

5 tra s are t s re n

6 gu rd for th to l spin le

7 s ark ar e tor

NOT For artic latio of th work re t, s e Fig re 10

Figure 10 – Ope in a gle a d dime sion for a g ard

Be c grind rs are tested at u der lo d o servin the con ition s own in Ta le I 101

Table I 101 – Operatin con itions for be c grinders

Work ie e an

orientatio

Grin in a h riz ntal plateof mid ste l with a le gth of a pro imately 15 mm, a

width e u l to th thic n s of th grin in wh el min s 5 mm a d a thic n s of

(5 ± 0,5) mm

Th work re t is a ju te s th t th work ie e is h riz ntal Th work ie e is

orie te s th t th fa e of th work ie e ma e u fom width a d thic n s is

gro n

Fe d forc Th work ie e is pre s d a ain t th work re t a dth wh el s a to minimiz a y

n is emis io b th work ie e its lf Th f ee forc s s al b d termin d b me n

of a s ale a d s al b re ord d

NOT Ty ic l forc s to a hie e th a o e are 10 N a ain t th wh el a d 3 N

a ain t th work re t

T ol bit New grin in wh el a s p le with th to l

If n grin in wh el is s p le with th to l a grin in wh el with a grain siz of 6

a d s ita le for grin in ste l is u e

I.3 Vibration

This clau e of Part 1 is not a pl ca le

Bibl ography

The biblogra h of Part 1 is a pl ca le

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