Bsi bs en 50144 2 6 2001 (2002)

BRITISH STANDARD BS EN 50144 2 6 2001 Incorporating Amendment No 1 Safety of hand held electric motor operated tools — Part 2 6 Particular requirements for hammers The European Standard EN 50144 2 6 2[.]

Incorporating Amendment No 1

Safety of hand-held

electric motor operated

tools —

Part 2-6: Particular requirements for

hammers

The European Standard EN 50144-2-6:2000, with the incorporation of

Amendment A1:2001, has the status of a British Standard

This British Standard, having

been prepared under the

direction of the

Electrotechnical Sector

Committee, was published

under the authority of the

Standards Committee and

comes into effect on

15 March 2001

© BSI 25 April 2002

National foreword

This British Standard is the official English language version of

EN 50144-2-6:2000 including amendment A1:2001 It supersedes

BS EN 50144-2-6:1997 which is withdrawn

The UK participation in its preparation was entrusted by Technical Committee CPL/61, Safety of household and similar electrical appliances, to Subcommittee CPL/61/6, Portable motor operated tools, which has the responsibility to:

A list of organizations represented on this subcommittee can be obtained on request to its secretary

Cross-references

The British Standards which implement international or European publications referred to in this document may be found in the BSI Standards Catalogue under the section entitled “International Standards Correspondence Index”, or by using the “Find” facility of the BSI Standards Electronic

Catalogue

A British Standard does not purport to include all the necessary provisions of

a contract Users of British Standards are responsible for their correct application

Compliance with a British Standard does not of itself confer immunity from legal obligations.

— aid enquirers to understand the text;

— present to the responsible European committee any enquiries on the interpretation, or proposals for change, and keep the UK interests informed;

— monitor related international and European developments and promulgate them in the UK

Summary of pages

This document comprises a front cover, an inside front cover, the EN title page, pages 2 to 17 and a back cover

The BSI copyright date displayed in this document indicates when the document was last issued

Sidelining in this document indicates the most recent changes by amendment

Amendments issued since publication

13540 25 April 2002 Indicated by a sideline

NORME EUROPÉENNE December 2000

EUROPÄISCHE NORM + A1

August 2001

CENELEC

European Committee for Electrotechnical Standardization Comité Européen de Normalisation Electrotechnique Europäisches Komitee für Elektrotechnische Normung

English version

Safety of hand-held electric motor operated tools Part 2-6: Particular requirements for hammers

(includes amendment A1:2001)

Sécurité des outils électroportatifs à

moteur

Partie 2-6: Règles particulières pour

les marteaux

(inclut l′amendement A1:2001)

Sicherheit handgeführter motorbetriebener Elektrowerkzeuge Teil 2-6: Besondere Anforderungen an Hämmer

(enthält Änderung A1:2001)

This European Standard was approved by CENELEC on 1998-10-01 Amendment A1 was approved by CENELEC on 2001-05-01 CENELEC members are bound to comply with the CEN/CENELEC Internal Regulations which stipulate the conditions for giving this European Standard the status of a national standard without any alteration

Up-to-date lists and bibliographical references concerning such national standards may be obtained on application to the Central Secretariat or to any CENELEC member

This European Standard exists in three official versions (English, French, German) A version in any other language made by translation under the responsibility of a CENELEC member into its own language and notified to the Central Secretariat has the same status as the official versions

CENELEC members are the national electrotechnical committees of Austria, Belgium, Czech Republic, Denmark, Finland, France, Germany, Greece, Iceland, Ireland, Italy, Luxembourg, Netherlands, Norway, Portugal, Spain, Sweden, Switzerland and United Kingdom

This European Standard has been prepared by the Technical Committee CENELEC TC 61F, Hand-held and transportable electric motor operated tools The text of the draft was submitted to the Unique Acceptance Procedure (UAP) in December 1993 and was approved by CENELEC as EN 50144-2-6 on 1994-10-04

A draft for an amendment was submitted to UAP in April 1994 and was approved by CENELEC on 1994-10-04 for inclusion into the European Standard

A further amendment was submitted to UAP in May 1996 and was approved by CENELEC as amendment A1 to EN 50144-2-6 on 1996-12-09

Amendments to fulfil the essential requirements of the Machinery Directive were submitted to the formal vote

in June 1998 and were approved by CENELEC on 1998-10-01 for inclusion, together with the earlier amendment, into a second edition of EN 50144-2-6

This European Standard supersedes EN 50144-2-6:1996

The following dates were fixed:

- latest date by which the EN has to be implemented

at a national level by publication of an identical

- latest date by which the national standards conflicting

This standard is divided into two parts:

Part 1: General requirements which are common to most hand-held electric motor operated tools (for the purpose of this standard referred to simply as tools)

Part 2: Requirements for particular types of tool which either supplement or modify the requirements given in Part 1 to account for the particular hazards and characteristics of these specific tools

This European Standard has been prepared under a mandate given to CEN/CENELEC by the European Commission and the European Free Trade Association and supports the essential health and safety requirements of the Machinery Directive

Compliance with the clauses of Part 1 together with this Part 2 provides one means of conforming with the essential health and safety requirements of the Directive

For noise and vibration this standard covers the requirements for their measurement, the provision of information arising from these measurements and the provision of information about the personal protective equipment required Specific requirements for the reduction of the risk arising from noise and vibration through the design of the tool are not given as this reflects the current state of the art As with any standard, technical progress will be kept under review so that any developments can be taken into account

CEN TC/255 is producing standards for non-electrically powered tools

Warning: Other requirements and other EC Directives can be applicable to the products falling within

the scope of this standard

This standard follows the overall requirements of EN 292-1 and EN 292-2

Subclauses, tables and figures which are additional to those in Part 1 are numbered starting from 101

NOTE: In this European Standard the following print types are used:

- Requirements proper;

- Test specifications;

- Explanatory matter.

Foreword to amendment A1

This amendment to the European Standard EN 50144-2-6 was prepared by the Technical Committee CENELEC TC 61F, Hand-held and transportable electric motor-operated tools

The text of the draft was submitted to the Unique Acceptance Procedure and was approved by CENELEC as amendment A1 to EN 50144-2-6:2000 on 2001-05-01

The following dates were fixed:

— latest date by which the amendment has to be implemented at

national level by publication of an identical national standard or by

— latest date by which the national standards conflicting with the

Page

1 Scope 5

2 Definitions 5

3 General requirements 5

4 General conditions for the tests 5

5 Rating 5

6 Classification 5

7 Marking and information for use 5

8 Protection against electric shock 6

9 Starting 6

10 Input and current 6

11 Heating 6

12 Leakage current 6

13 Environmental requirements 6

14 Moisture resistance 9

15 Insulation resistance and electric strength 9

16 Endurance 9

17 Abnormal operation 9

18 Mechanical hazards 9

19 Mechanical strength 11

20 Construction 11

21 Components 12

22 Internal wiring 12

23 Supply connection and external flexible cables and cords 12

24 Terminals for external conductors 12

25 Provision for earthing 12

26 Screws and connections 12

27 Creepage distances, clearances and distances through insulation 12

28 Resistance to heat, fire and tracking 12

29 Resistance to rusting 12

30 Radiation 12

Annexes 17

1 Scope

This clause of Part 1 is applicable except as follows:

Addition:

This European Standard applies to hammers including rotary hammers

This standard does not give requirements for the design of the tool for the reduction of the risk arising from noise and vibration

2 Definitions

This clause of Part 1 is applicable except as follows:

2.2.18 Replacement:

2.2.18 normal load: load obtained when the hammer, mounted in an apparatus as shown in Figure 101,

is operated intermittently, each cycle comprising a period of operation of 30 s and a rest period of 90 s with the hammer switched off, an axial force just sufficient to ensure steady operation of the hammer mechanism being applied to the hammer through a resilient medium

3 General requirements

This clause of Part 1 is applicable

4 General conditions for the tests

This clause of Part 1 is applicable

5 Rating

This clause of Part 1 is applicable

6 Classification

This clause of Part 1 is applicable

7 Marking and information for use

This clause of Part 1 is applicable except as follows:

7.13.1 Addition:

— information on the correct use of dust collection equipment, if fitted;

Additional subclause:

7.13.101 The instruction sheet shall also include the following: “Hearing protection should be worn”

8 Protection against electric shock

This clause of Part 1 is applicable

9 Starting

This clause of Part 1 is applicable

10 Input and current

This clause of Part 1 is applicable

11 Heating

This clause of Part 1 is applicable except as follows:

11.2 Addition:

If it is not possible to attain rated input when operating the hammer as specified for normal load, the hammer

is loaded by means of a brake adjusted so as to attain rated input, the hammer mechanism being not engaged or removed.

11.6 Addition:

The temperature rise limit specified for the external enclosure does not apply to the hammer mechanism.

12 Leakage current

This clause of Part 1 is applicable

13 Environmental requirements

This clause of Part 1 is applicable except as follows:

13.1.2 Replacement:

The tests under working conditions, orientation within the cabin and material to be worked shall be in accordance with the following:

Material Concrete block 800 mm ´ 500 mm ´ 200 mm, formulation in accordance with Table 101

Table 101 — Concrete formulation (per cubic metre) Cement Water Aggregate

1844 kg

Particle size Fraction (%)

Compressive strength after 28 days to be 40 N/mm2

Feed-speed Just sufficient force to ensure steady working.

Depth of cut 80 % of drill bit length but not more than 190 mm

Width of cut-off Not applicable

Tool bit/cutter/ Type as specified by the manufacturer which is as close as possible to Table 102 abrasive

Table 102 — Drill bit size Tool mass

Diameter of

drill bit

Usable length

of drill bit

New or sharpened drill to be used at the start of the test period

Integral collection Emptied as required during a pause in the test

(if any)

Orientation Hammers having a tool mass of up to 10 kg:

drilling in a horizontal direction across the cabin with the airflow from left to right of the operator (see Figure 102) Holes drilled to be within 90 cm to 120 cm of the floor This is achievable by placing the test block on a bench 80 cm high, the 800 mm side

of the test block being horizontal

Hammers having a tool mass of over 10 kg:

drilling down in a vertical direction, with the airflow from left to right of the operator The upper surface of the test block should be between 200 mm and 400 mm above the floor surface

This allows the block to be supported on e.g wood blocks for ease of transportation

Test requirements for hammers without rotary action are not covered by this standard

13.2.2 Replacement of paragraph 2:

For hammers with rotary action the speed setting shall be that recommended by the manufacturer for the drill bit size defined for the test for drilling in concrete

13.2.3 Replacement:

Rotary hammers are tested under load as shown in Figure 103 and in accordance with the conditions shown

in Tables 101, 102 and 103

Care shall be taken that the location of the work piece on its support does not adversely affect the result of the test If necessary, the work piece shall be supported on a resilient material 20 mm thick which compresses to 10 mm under the weight of the work piece

The result to be used shall be the arithmetic mean, rounded off to the nearest decibel, of the values obtained from five consecutive tests

The tool shall be held by the operator in such as way as to correspond to normal use

Table 103 — Test conditions for rotary hammers

Orientation Drilling vertically down in into a concrete block having the formulation specified

in Table 101 and having the dimensions 500 mm ´ 500 mm and 200 mm in height and supported on resilient material

Tool bit Drill bit as recommended by the manufacturer for drilling in concrete and of the

size defined in Table 102

Feed force 1,5 times the mass of the tool but not less than 80 N

Test cycle Measurement starts when the drill bit has reached a depth equal to its diameter

and stops when the depth has reached 80 % of its usable length or 180 mm, whichever is the shorter

13.3.4 Replacement of paragraph 2:

For hammers without rotary action all speed setting devices shall be adjusted to the highest value For hammers with rotary action the speed setting shall be that recommended by the manufacturer for the drill bit size defined for the test for drilling in concrete

13.3.7 Replacement of paragraphs 1 and 3:

Hammers with rotary action are tested under load as shown in Figure 103 and in accordance with the conditions shown in Tables 101, 102 and 103

Hammers without rotary action are tested under load in the test fixture shown in Figure 104 and defined in Table 104, which is mounted on a concrete block having the formulation and dimensions specified in Tables 101 and 103

The test fixture shown in Figure 104, which is made of steel, consists of a tube filled with hardened steel balls (ball bearings) on which a specially constructed test tool bit impacts The parts of the fixture apart from the test tool shall be rigidly clamped to prevent additional vibration The length of the test tool bit shall correspond to the shortest normal tool recommended by the manufacturer, the test tool bit rebound shall be restrained by means of a spring exerting just sufficient force to prevent “chattering”

Table 104 — Test fixture parameters for hammers without rotary action

Shank diameter d

mm

Steel tube diameter D

mm

Steel ball diameter

mm Ball column height Hmm

When using the test fixture shown in Figure 104, the force to be applied to the tool in addition to its weight shall be sufficient to ensure stable operation In general, this is achieved by a feed force, expressed in N, which is 30 times the mass of the tool in kg but not more than 200 N

14 Moisture resistance

This clause of Part 1 is applicable

15 Insulation resistance and electric strength

This clause of Part 1 is applicable

16 Endurance

This clause of Part 1 is applicable except as follows:

16.2 Replacement:

Hammers without rotary action as well as rotary hammers are mounted in the vertical position in an apparatus as shown in Figure 101 They are operated at rated voltage or at the upper limit of the rated voltage range and under normal load for four periods of 6 h each, the interval between these periods being

at least 30 min.

Rotary hammers which have a selector switch to select the mode of operation shall be operated with such a switch set to the combined mode position (hammer with rotation).

17 Abnormal operation

This clause of Part 1 is applicable

18 Mechanical hazards

This clause of Part 1 is applicable except as follows:

18.3 Replacement:

Rotary hammers having an input power of 700 W or more shall have at least two handles to control the tool One of the handles may be the body of the tool if suitably shaped

Additional subclauses:

18.101 Rotary hammers shall be constructed in such a way that reaction torques, including sudden stalling torque, which can lead to injuries to hands and arms or to accidents resulting from persons falling or dropping tools, are avoided

Compliance is checked by the tests described in 18.101.1, 18.101.2 and 18.101.3.

18.101.1 The range of operating conditions is such that it is not possible to specify a single test to represent them all However, measurements indicate that a maximum force of 400 N is acceptable at the centre of the hand Using this maximum reaction force, the maximum allowed reaction torque MRmax can be calculated for various tool configurations and lever arm lengths and these are shown at 18.101.2.1 and 18.101.2.2.