– 2 –
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`60670-1  IEC:2002+
`
`CONTENTS
`FOREWORD ...............................................................................................................
`
`1 Scope ...................................................................................................................
`2 Normative references ............................................................................................
`3 Definitions .............................................................................................................
`4 General requirements ............................................................................................
`5 General notes on tests ..........................................................................................
`6 Ratings .................................................................................................................
`7 Classification ........................................................................................................
`8 Marking .................................................................................................................
`9 Dimensions ...........................................................................................................
`10 Protection against electric shock ...........................................................................
`11 Provision for earthing ............................................................................................
`12 Construction ..........................................................................................................
`13 Resistance to ageing, protection against ingress of solid objects and against
`harmful ingress of water ........................................................................................
`14 Insulation resistance and electric strength .............................................................
`15 Mechanical strength ..............................................................................................
`16 Resistance to heat ................................................................................................
`17 Creepage distances, clearances and distances through sealing compound ...........
`18 Resistance of insulating material to abnormal heat and fire ...................................
`19 Resistance to tracking ...........................................................................................
`20 Resistance to corrosion .........................................................................................
`21 Electromagnetic compatibility (EMC) .....................................................................
`
`Annex A (informative) Examples of enclosures and parts thereof ................................
`
`Bibliography ................................................................................................................
`
`Figure 1 – Examples of membranes and grommets ......................................................
`Figure 2 – Earthing strap (see 11.2) ............................................................................
`Figure 3 – Test strap (see 11.2) ..................................................................................
`Figure 4 – Volume measurement (see 12.12.5 12.15) ..................................................
`Figure 5 – Test wall in accordance (see 13.3.2) ..........................................................
`Figure 6 – Reference surfaces for boxes and enclosures .............................................
`Figure 7 – Mounting block for flush-type equipment boxes and enclosures
`in order to apply blows on the rear surface (see 15.3) .................................................
`Figure 8 – Apparatus for impact test at low temperature (see 15.1) .............................
`Figure 9 – Application points for blows for part A (see 15.3) Height of fall for blows for
`part A (see 15.3) .........................................................................................................
`Figure 10 – Sequence of blows for parts A, B, C, D, E, F and G (see 15.3) ..................
`Figure 11 – Apparatus for testing the cable anchorage (see 12.6) ...............................
`
`Formatted: Font: Not Bold
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`Figure 12 – Arrangement for test on covers or cover-plates (see 12.1.2.2) ..................
`Figure 13 – Gauge (thickness about 2 mm) for the verification of the outline of lids,
`covers or cover-plates (see 12.1.2.3)...........................................................................
`Figure 14 – Examples of application of the gauge of Figure 13 on covers fixed without
`screws on a mounting surface or supporting surface (see 12.1.2.3) .............................
`Figure 15 – Examples of application of the gauge of Figure 13 (see 12.1.2.3) .............
`Figure 16 – Gauge for verification of grooves, holes and reverse tapers (see 12.1.2.4)
`Figure 17 – Sketch showing the direction of application of the gauge of Figure 16
`(see 12.1.2.4) ..............................................................................................................
`Figure 18 – Verification of fixing means for boxes and enclosures classified according
`to 7.7.1 (see 12.11) .....................................................................................................
`Figure 19 – Test according to to 12.14.3 12.12.3 .........................................................
`Figure 20 – Rigid crossbar (see 16.3) ..........................................................................
`Figure 21 – Diagrammatic representation of the glow-wire test (see Clause 18) ..........
`Figure 22 – Example of mounting block for boxes to be embedded in masonry (flush
`type and semi-flush type) according to 12.10 ...............................................................
`Figure 23 – Example of the fixing of the auxiliary device mounted on a specimen
`according to 12.10 .......................................................................................................
`Figure 24 – Example of test apparatus for the test according to 12.10 .........................
`Figure 25 – Example of the protected volume (see 13.3.4) ..........................................
`Figure 26 – Demonstration of the non-penetration of the internal volume .....................
`Figure A.1 – Examples of enclosures and parts of thereof ...........................................
`
`Table 1 – Classification of boxes and enclosures .........................................................
`Table 2 – Forces to be applied to covers, cover-plates or actuating members whose
`fixing is not dependent on screws ................................................................................
`Table 3 – Forces and torques to be applied to cable anchorages .................................
`Table 4 – Tightening torques for the verification of the mechanical strength of screws .
`Table 5 – Torque test values for cable glands ..............................................................
`Table 6 – Test voltage for electric strength test ...........................................................
`Table 7 – Determination of parts A, B, C, D E, F and G ...............................................
`Table 8 – Height of fall for impact test .........................................................................
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`60670-1  IEC:2002+
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`INTERNATIONAL ELECTROTECHNICAL COMMISSION
`____________
`
`BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES
`FOR HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIO
`
`Part 1: General requirements
`
`FOREWORD
`
`3)
`
`4)
`
`1) The International Electrotechnical Commission (IEC) is a worldwide organization for standardization c
`all national electrotechnical committees (IEC National Committees). The object of IEC is to
`international co-operation on all questions concerning standardization in the electrical and electronic
`this end and in addition to other activities, IEC publishes International Standards, Technical Spe
`Technical Reports, Publicly Available Specifications (PAS) and Guides (hereafter referred to
`Publication(s)”). Their preparation is entrusted to technical committees; any IEC National Committee
`in the subject dealt with may participate in this preparatory work. International, governmental
`governmental organizations liaising with the IEC also participate in this preparation. IEC collaborat
`with the International Organization for Standardization (ISO) in accordance with conditions dete
`agreement between the two organizations.
`2) The formal decisions or agreements of IEC on technical matters express, as nearly as possible, an in
`consensus of opinion on the relevant subjects since each technical committee has representatio
`interested IEC National Committees.
`IEC Publications have the form of recommendations for international use and are accepted by IE
`Committees in that sense. While all reasonable efforts are made to ensure that the technical cont
`Publications is accurate, IEC cannot be held responsible for the way in which they are used
`misinterpretation by any end user.
`In order to promote international uniformity, IEC National Committees undertake to apply IEC P
`transparently to the maximum extent possible in their national and regional publications. Any d
`between any IEC Publication and the corresponding national or regional publication shall be clearly in
`the latter.
`IEC itself does not provide any attestation of conformity. Independent certification bodies provide
`assessment services and, in some areas, access to IEC marks of conformity. IEC is not responsib
`services carried out by independent certification bodies.
`6) All users should ensure that they have the latest edition of this publication.
`7) No liability shall attach to IEC or its directors, employees, servants or agents including individual e
`members of its technical committees and IEC National Committees for any personal injury, property
`other damage of any nature whatsoever, whether direct or indirect, or for costs (including legal
`expenses arising out of the publication, use of, or reliance upon, this IEC Publication or any
`Publications.
`8) Attention is drawn to the Normative references cited in this publication. Use of the referenced pub
`indispensable for the correct application of this publication.
`9) Attention is drawn to the possibility that some of the elements of this IEC Publication may be the
`patent rights. IEC shall not be held responsible for identifying any or all such patent rights.
`
`5)
`
`This consolidated version of IEC 60670-1 consists of the first edition (2002) [doc
`23B/681/FDIS and 23B/693/RVD], its amendment 1 (2011) [documents 23B/981/F
`23B/991/RVD] and its corrigendum of February 2003. It bears the edition number
`
`The technical content is therefore identical to the base edition and its amendm
`has been prepared for user convenience. A vertical line in the margin shows w
`base publication has been modified by amendment 1. Additions and deleti
`displayed in red, with deletions being struck through.
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`International Standard IEC 60670-1 has been prepared by subcommittee 23B: Plugs
`outlets and switches, of IEC technical committee 23: Electrical accessories.
`
`This publication has been drafted in accordance with the ISO/IEC Directives, Part 2.
`
`In this publication, the following print types are used:
`
`−
`−
`−
`
`requirements proper: in roman type
`test specifications: in italic type
`notes: in smaller roman type.
`
`The committee has decided that the contents of the base publication and its amendm
`remain unchanged until
`the stability date
`indicated on
`the
`IEC web site
`"http://webstore.iec.ch" in the data related to the specific publication. At this d
`publication will be
`
`reconfirmed,
`•
`• withdrawn,
`•
`replaced by a revised edition, or
`•
`amended.
`
`IMPORTANT – The “colour inside” logo on the cover page of this publication indicates
`that it contains colours which are considered to be useful for the correct understanding
`of its contents. Users should therefore print this publication using a colour printer.
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`60670-1  IEC:2002+
`
`BOXES AND ENCLOSURES FOR ELECTRICAL ACCESSORIES
`FOR HOUSEHOLD AND SIMILAR FIXED ELECTRICAL INSTALLATIO
`
`Part 1: General requirements
`
`1 Scope
`
`This part of IEC 60670 applies to boxes, enclosures and parts of enclosures (hereaft
`“boxes” and “enclosures”) for electrical accessories with a rated voltage not ex
`1 000 V a.c. and 1 500 V d.c. intended for household or similar fixed electrical insta
`either indoors or outdoors.
`
`NOTE Requirements for particular types of boxes and enclosures are given in the relevant parts 2 of IEC
`
`Boxes and enclosures complying with this standard are suitable for use at ambi
`perature not normally exceeding 25 °C but occasionally reaching 35 °C.
`
`This International Standard is intended to apply to boxes and enclosures for e
`accessories within the scope of IEC technical committee 23.
`
`NOTE This standard may also be used as a reference document for other IEC technical comm
`subcommittees.
`
`A box or an enclosure which is an integral part of an electrical accessory and
`protection for that accessory against external influences (for example mechanical
`ingress of solid objects or water, etc.) is covered by the relevant standard for
`accessory.
`
`This standard does not apply to
`
`–
`–
`–
`
`ceiling roses;
`luminaire supporting couplers;
`boxes, enclosures and parts of enclosures specifically designed to be used f
`trunking and ducting systems complying with IEC 61084 and which are not intend
`installed outside of these systems.
`
`2 Normative references
`
`The following referenced documents are indispensable for the application of this do
`For dated references, only the edition cited applies. For undated references, the lates
`of the referenced document (including any amendments) applies.
`
`IEC 60068-2-75:1997, Environmental testing – Part 2-75: Tests – Test Eh: Hammer te
`
`IEC 60112:1979, Method for determining the comparative and the proof-tracking in
`solid insulating materials under moist conditions
`
`IEC 60423:1993, Conduits for electrical purposes – Outside diameters of cond
`electrical installations and threads for conduits and fittings
`
`IEC 60529:1989, Degrees of protection provided by enclosures (IP Code)
`
`IEC 60695-2-11:2000, Fire hazard testing – Part 2-11: Glowing/hot-wire based test m
`Glow-wire flammability test method for end-products
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`IEC 60695-10-2:1995, Fire hazard testing – Part 10-2: Guidance and test methods
`minimization of the effects of abnormal heat on electrotechnical products involved i
`Method for testing products made from non-metallic materials for resistance to heat u
`ball pressure test
`
`IEC 60981:1989, Extra-heavy duty rigid steel conduits for electrical installations
`
`IEC 61032:1997, Protection of persons and equipment by enclosures – Probes for ver
`
`IEC 61084 (all parts), Cable trunking and ducting systems for electrical installations
`
`IEC 61140:2001, Protection against electric shock – Common aspects for installa
`equipment
`
`Formatted: Font: 9 pt, Not Italic,
`Complex Script Font: 9 pt
`
`IEC 62444:2010, Cable glands for electrical installations
`
`3 Definitions
`
`For the purposes of this part of IEC 60670, the following definitions apply.
`
`3.1
`enclosure
`combination of parts, such as boxes, covers, cover-plates, lids, box extensions, acce
`etc., providing after assembly and installation as in normal use, an appropriate p
`against external influences, and a defined protection against contact with enclosed l
`from any accessible direction (see Annex A)
`
`3.2
`box
`part of an enclosure provided with means for fixing a cover, cover-plate, accessory,
`intended to receive accessories (such as socket-outlets, switches, etc.)
`
`3.3
`box extension
`part of an enclosure which is intended to extend a box for the purpose of either increa
`internal volume of the box or enclosure or to adjust for mounting the box flush or se
`with the finished surface of a wall or the like
`
`3.4
`lid, cover or cover-plate
`part of an enclosure, not integral with or part of an accessory, which may either r
`accessory in position or enclose it
`
`3.5
`raised cover
`cover intended for mounting directly onto a box to provide for the attachment of acc
`and to increase the internal volume of the enclosure
`NOTE The centre portion of the cover is raised to accommodate a specific wall or ceiling thickness and
`the mounting of the accessory on it, flush with the surface of the wall or ceiling.
`
`3.6
`exposed conductive part
`conductive part of electrical equipment, which can be touched and which is not norm
`but which can become live when basic insulation fails
`
`3.7
`surface mounting box or enclosure
`box or enclosure which is intended for mounting on a surface (see Annex A)
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`3.8
`flush-mounting box or enclosure
`box or enclosure which is intended for mounting flush with the surface (see Annex A)
`
`3.9
`semi-flush mounting box or enclosure
`box or enclosure which is intended to fit within a mounting surface and partially proje
`the mounting surface
`
`3.10
`cable gland
`device designed to permit the entry of a cable into an enclosure and which provides
`and retention. It may also provide other functions such as earthing, bonding, insulatio
`guarding, strain relief or a combination of these
`a device designed to permit the entry of a cable, flexible cable or insulated conducto
`enclosure, and which provides sealing and retention. It may also provide other functio
`as earthing, bonding, insulation, cable guarding, strain relief or a combination of these
`
`3.11
`seal (packing)
`material used to fill up the space between the inside of a gland and the cable
`through, usually compressed by the gland and thereby forming a joint
`
`3.12
`gasket
`material introduced between mating surfaces of an enclosure which in compression
`joint
`
`3.13
`grommet
`component used to support and protect the cable or conduit at the point of entry. It m
`prevent the ingress of moisture or contaminants (see Figure 1)
`
`3.14
`entry membrane
`component or an integral part of an enclosure used to protect the cable which may be
`support the cable or conduit at the point of entry
`NOTE An entry membrane may also prevent the ingress of moisture or contaminants and may be part of a gro
`Figure 1).
`
`3.15
`protecting membrane
`component or an integral part of an enclosure that is not intended to be penetrated i
`use and is intended to provide protection against ingress of water or solid objects a
`allow the operation of an accessory (see Figure 1).
`
`3.16
`composite material
`combination of metal and insulating material
`
`3.17
`spout (hub)
`open entry of a box permitting the insertion and containment of a conduit
`
`3.18
`cable retention
`ability to limit the displacement of a fitted cable against pull forces
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`3.19
`cable anchorage
`ability to limit the displacement of a fitted flexible cable against pull and push for
`torques
`
`Formatted: TERM-definition
`
`3.20
`blanking-plug
`a blanking-plug is a component used to close an open inlet or an open knock out
`
`4 General requirements
`
`Each part of the enclosure shall be so designed and constructed that, when moun
`installed as for normal use, the enclosure ensures adequate electrical and me
`protection to the parts so enclosed and minimizes the risk of danger to the
`surroundings.
`
`Compliance is checked by carrying out the relevant tests specified.
`
`5 General notes on tests
`
`5.1 Tests according to this standard are type tests.
`
`Unless otherwise specified boxes and enclosures are tested as delivered.
`
`Accessories complying with other standards are not tested.
`
`Tests on boxes and enclosures of insulating material shall be performed after a p
`tioning of at least 10 days at ambient temperature and relative air humidity of betwe
`and 85 %.
`
`Unless otherwise specified the tests shall be carried out in the order of the claus
`ambient temperature of (20 ± 5) °C on a set of three new specimens.
`
`5.2
`If one of the specimens does not satisfy a test due to an assembly or a manu
`fault, that test and any preceding ones which may have influenced the results of the t
`be repeated and also the tests which follow shall be made in the required sequ
`another full set of specimens, all of which shall comply with the requirements.
`
`NOTE When submitting the first set of specimens, the applicant may also submit the additional set of
`which may be necessary, should one specimen fail. The testing station will then, without further reques
`additional set of specimens and will only reject if a further failure occurs. If the additional set of specim
`submitted at the same time, the failure of one specimen will entail rejection.
`
`6 Ratings
`
`See relevant parts 2 of this standard.
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`60670-1  IEC:2002+
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`
`
`7 Classification
`
`Boxes and enclosures are classified according to Table 1.
`
`Table 1 – Classification of boxes and enclosures
`
`7.1 The nature of their material
`
`7.2 The method of installation a
`
`Classification criteria
`Insulating
`7.1.1
`7.1.2 Metallic
`7.1.3 Composite
`7.2.1 Flush, semi-flush or
`embedded in
`
`7.2.2 Surface mounting on
`
`7.2.3 Placement
`
`7.3.1 With inlets for sheathed
`cables for fixed installations
`7.3.2 With inlets for flexible cables
`7.3.3 With inlets for plain or
`corrugated conduits
`7.3.4 With inlets for threaded
`conduits
`7.3.5 With inlets for other types of
`conductors/cables or conduits
`7.3.6 With spouts (hub)
`7.3.7 Without inlets. Inlet openings
`will be made during installation
`7.4.1 With cable retention
`7.4.2 With cable anchorage
`7.4.3 With clamping means for
`flexible conduit
`7.4.4 Without clamping means
`7.5.1 –5 °C to +60 °C
`7.5.2 –15 °C to +60 °C
`7.5.3 –25 °C to +60 °C
`7.6.1 +60 °C
`7.6.2 +90 °C d
`
`7.3 The type(s) of inlets (outlets) b
`
`7.4 The clamping means
`
`7.5 The minimum and maximum
`temperatures during installation
`
`7.6 The maximum temperature
`during the casting process c
`
`
`
`
`
`7.2.1.1 Non-combustible walls,
`non-combustible ceilings or non-
`combustible floors
`7.2.1.2 Combustible walls,
`combustible ceilings or combustible
`floors
`7.2.1.3 Hollow walls, hollow
`ceilings, hollow floors or furniture
`7.2.2.1 Non-combustible walls,
`non-combustible ceilings, non-
`combustible floors or
`non-combustible furniture
`7.2.2.2 Combustible walls,
`combustible ceilings, combustible
`floors or combustible furniture
`7.2.3.1 Suitable for installation into
`concrete during the casting process
`(see 7.6)
`7.2.3.2 Suitable for all types of
`installation except into concrete
`
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`7.7 Boxes and enclosures for
`hollow walls and the like according
`to 7.2.1.3 are classified as
`
`Table 1 (continued)
`Classification criteria
`7.7.1 Class Ha
`7.7.2 Class Hb
`
`7.7.3 According to the degree of
`protection of the part mounted in the
`hollow wall
`
`
`7.7.2.1 Class Hb for walls
`7.7.2.2 Class Hb for ceilings
`7.7.3.1
`IP2X
`
`7.7.3.2 >IP2X
`
`7.8.1 Boxes supplied with screws
`
`
`
`7.8 The provision for fixing
`accessories to boxes
`
`7.8.2 Boxes intended to receive
`screws
`7.8.3 Boxes intended to receive
`claws
`7.8.4 Boxes intended to receive
`other means
`a Boxes and enclosures may be suitable for more than one method of installation.
`b Boxes and enclosures may have more than one type of inlet.
`c These apply only to boxes and enclosures classified according to 7.2.3.1.
`d These types are for use in concrete and will temporarily withstand temperatures up to +90 °C during the casting
`process.
`
` Marking
`
` 8
`
`8.1 Boxes and enclosures shall be marked with
`
`a) the name, trade mark or identification mark of the manufacturer or the responsible
`
`
`
`In addition enclosures shall be marked with
`
`b) the IP code against ingress of solid objects if higher than IP2X in which case the
`IP numeral shall also be marked;
`c) the IP code against harmful ingress of water if higher than IPX0 in which case th
`numeral shall also be marked.
`IPXX
`d) the following marking on cover of flush enclosures intended to be mounted o
`surfaces and where the IP is dependent on the surface (see Figure 5).
`
`
`
`The IP code, if applicable, shall be marked on the outside of the enclosure so as to b
`discernible when the enclosure is mounted and wired as for normal use.
`
`Formatted: List
`
`e) the type reference, which may be a catalogue number;
`NOTE
`In the following country the marking of the type reference is not used: UK.
`
`The following information shall be marked on the boxes and enclosures or provide
`manufacturer on the smallest package unit or in the instructions of the manufacturer:
`
`
`
`the maximum temperature during the building process if 90 °C;
`f)
`g) the necessary information concerning the openings which can be made during ins
`in the case of boxes and enclosures classified according to 7.3.7;
`h) the minimum temperature during installation for boxes classified according
`and 7.5.3;
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`i)
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`j)
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`– 12 –
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`60670-1  IEC:2002+
`
`for boxes and enclosures classified as in 7.7.2, the minimum internal volume in
`determined by the test in 12.15 2.5. The internal volume shall be marked on the
`the box or enclosure. The marking on a box or enclosure shall be such that the v
`be read after installation of the box in the normal manner but before the installatio
`wiring devices and wiring;
`the symbol Ha for boxes classified according to 7.7.1 and the symbol Hb fo
`classified according to 7.7.2.
`
`Unless self-evident, further information for the correct use of the enclosure shall be
`the manufacturer's catalogue or in an instruction sheet.
`
`In special cases, in order to achieve a higher degree of protection by the use of spec
`an instruction sheet should be provided and should indicate the higher degree of pr
`In such a case, the marking covers the initial degree of protection.
`
`
`
`8.2 The marking on the boxes and enclosures shall be durable and easily legible.
`
`Compliance with 8.1 and 8.2 is checked by inspection and by the following test.
`
`
`
`
`
`
`
`
`
`
`The test is made by rubbing the marking by hand for 15 s with a piece of cloth soa
`water and again for 15 s with a piece of cloth soaked with petroleum spirit.
`
`
`
`NOTE 1 Marking made by impression, moulding, pressing or engraving is considered durable and is the
`subjected to this test.
`NOTE 2
`It is recommended that the petroleum spirit used consist of a solvent hexane with an aromatic
`maximum 0,1 % by volume, a kauributanol value of approximately 29, an initial boiling-point of app
`65 °C, a dry point of approximately 69 °C and a density of approximately 0,68 g/cm³.
`
`
`
`
`
`After the test the marking shall still be legible.
`
`9 Dimensions
`
`Boxes and enclosures shall comply with the appropriate standard sheets, if any.
`
`Compliance is checked by inspection and measurement.
`
`10 Protection against electric shock
`
`Boxes and enclosures shall be so designed that, when they are assembled, equip
`installed as for normal use in accordance with the manufacturer's instructions, the l
`are not accessible.
`
`
`
`
`
`Enclosures shall have a degree of protection of at least IPXXB, when assembled, e
`and installed as for normal use.
`
`Where enclosures are supplied without a cover, cover-plate or an accessory they ar
`with the appropriate parts fitted according to the information given in the manuf
`instructions.
`
`Compliance is checked by inspection and in case of doubt by the following test.
`
`Enclosures shall be tested with test probe 11 according to IEC 61032 applied for 1 m
`force of 20 N, and the test probe shall not enter that part of the enclosure where live p
`to be installed according to the manufacturer's instructions.
`
`
`
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`Tests shall be carried out on parts which are accessible after installation.
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`Cooper Ex. 1014
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`60670-1 © IEC:2002+A1:2011
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`– 13 –
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`In addition, all enclosures according to 7.1.1 and 7.1.3 with parts of thermop
`elastomeric material shall be subjected for 1 min to a force applied through the tip
`probe 11 of IEC 61032 but at an ambient temperature of (35 ± 2) °C, the enclosure
`this temperature.
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`The probe is applied to
`– all places except membranes or the like, where yielding of insulating material cou
`the safety, with a force of 75 N;
`– knock-outs with a force of 10 N.
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`Boxes and enclosures shall be so designed that, when they are assembled, equip
`installed as for normal use in accordance with the manufacturer's instructions, live p
`not accessible.
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`Where enclosures are supplied without a cover, cover-plate or an accessory they ar
`with the appropriate parts fitted according to the information given in the manuf
`instructions.
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`Compliance is checked by inspection and in case of doubt by the following test.
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`Enclosures shall be tested with test probe 11 according to IEC 61032 applied for 1 m
`force of 20 N, and the test probe shall not penetrate in the internal volume of the en
`as shown in Figure 26.
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`Formatted: English (United Kingdom)
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`Tests shall be carried out on parts which are accessible after installation.
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`Formatted: English (United Kingdom)
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`Formatted: Normale.PARAGRAPH,
`Space After: 0 pt
`Formatted: Font: Italic, English
`(United Kingdom)
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`In addition, all enclosures according to 7.1.1 and 7.1.3 with parts made of thermop
`elastomeric material shall be subjected for 1 min to a force applied through the tip
`probe 11 of IEC 61032 but at an ambient temperature of (35 ± 2) °C, the enclosure
`this temperature.
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`The probe is applied to all places except membranes or the like, where yielding of in
`material could impair the safety, with a force of 75 N.
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`11 Provision for earthing
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`11.1 Boxes and enclosures with exposed conductive parts
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`Boxes and enclosures with exposed conductive parts shall be provided with an
`means of low resistance or have provision for the fitting of such an earthing means
`purpose of this requirement, small screws and the like, for fixing bases, covers o
`plates, etc. isolated from live parts, are not considered as exposed conductive parts.
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`Exposed conductive parts of covers or cover-plates shall be connected through
`resistance connection to the earthing means when fitted as for normal use.
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`Compliance is checked by inspection and the following test.
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`A current derived from an a.c. source having a no-load voltage not exceeding 12 V a
`to (25 ± 1) A is passed between the earthing terminal and each exposed conductiv
`turn. The voltage drop between the earthing terminal and each of the exposed co
`parts is measured, and the resistance calculated from the current and this voltage dro
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`In no case shall the resistance exceed 0,05 Ω.
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`NOTE 1 Care should be taken that the contact resistance between the tip of the measuring prob
`exposed conductive part under test does not influence the test results.
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`Cooper Ex. 1014
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`

`

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`
`– 14 –
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`60670-1  IEC:2002+
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`In insulating boxes and enclosures having an IP > X0, provisions can be made for the addition
`NOTE 2
`for the effective continuity of the earthing conductor, when more than one inlet is provided.
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`Boxes and enclosures with exposed conductive parts shall be provided with an
`means of low resistance or have provision for the fitting of such an earthing means
`purpose of this requirement, small screws and the like, for fixing bases, covers or cov
`etc. isolated from live parts, are not considered as exposed conductive parts.
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`The earthing means or the provision for the fitting of such an earthing means shall be
`so that:
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`the means is readily accessible through the open face of the box, and
`the removal of an accessory mounted in the box does not disturb the continuit
`earthing circuit, and
`the means is not part of a removable cover, back, or side of the box or enclosure.
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`Compliance is checked by inspection.
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`Exposed conductive parts of covers or cover-plates shall be connected throug
`resistance connection to the earthing means when fitted as for normal use.
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`Compliance is checked by the following test.
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`A current derived from an a.c. source having a no-load voltage not exceeding 12 V a
`to (25 ± 1) A is passed b