60950-1 © |EC:2005+A1:2009
`+A2i20‘l3
`
`— 123 —
`
`2.10.12 Enclosed and sealed parts
`
`For components or subassemblies that are adequately enclosed by enveloping or hermetic
`seating to prevent ingress of dirt and moisture. the values for Pollution Degree 1 apply to
`internal CLEARANCES and CREEPAGE DISTANCES.
`
`NOTE Some examples of such construction include parts in boxes that are hermetically sealed by adhesive or
`otherwise. and parts enveloped in a dip coat.
`
`if necessary, by
`Compliance is checked by inspection from the outside, measurement and,
`test. A component or subassembly is considered to be adequately enclosed if a sample
`passes the tests of 2.10.10.
`
`3 Wiring, connections and supply
`
`3.1 General
`
`3.1.1 Current rating and overcurrent protection
`
`The cross-sectional area of internal wires and lNTERCONNECTlNG CABLES shall be adequate for
`the current they are intended to carry when the equipment is operating under NORMAL LOAD
`such that the maximum permitted temperature of conductor insulation is not exceeded.
`
`All internal wiring (including busbars) and INTERCONNECTING CABLES used in the distribution of
`PRIMARY ciacun power shall be protected against cvercurrent and short—circuit by suitably
`rated protective devices.
`
`Wiring not directly involved in the distribution path does not require protection it
`shown that creation of hazards is unlikely (for example, indicating circuits).
`
`it can be
`
`NOTE 1 Devices for overload protection of components may also provide protection ofassociated wiring.
`NOTE 2
`Internal circuits connected to a MAINS SUPPLY may require individual protection depending on reduced
`wire size and length of conductors.
`
`Compliance is checked by inspection and, as appropriate, by the tests of 4.5.2 and 4.53.
`
`3.1.2 Protection against mechanical damage
`
`Wireways shall be smooth and free from sharp edges. Wires shall be protected so that they
`do not come into contact with burrs, cooling fins, moving parts, etc.. which could cause
`damage to the insulation of conductors. Holes in metal, through which insulated wires pass.
`shall have smooth well-rounded surfaces or shall be provided with bushings.
`
`It is permitted for wires to be in close contact with wire wrapping posts and the like if any
`breakdown of insulation will not create a hazard, or if adequate mechanical protection is
`provided by the insulation system.
`
`Compliance is checked by inspection.
`
`3.1.3 Securing of internal wiring
`
`internal wiring shall be routed, supported, clamped or secured in a manner that reduces the
`likelihood of:
`
`—
`
`—
`
`_
`
`excessive strain on wire and on terminal connections; and
`
`loosening of terminal connections; and
`
`damage of conductor insulation.
`
`Page 125 of 648
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`VOLTSERVER EXHIBIT 1023 (part 3 of 11)
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`

`

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`50950—1©|EC:2005+A1:2009
`+A2:2013
`
`3.1.4
`
`Insulation of conductors
`
`Except as covered in 2.1.1.3 b), insulation of individual conductors of internal wiring shall fulfil
`the requirements of 2.10.5 and be capable of withstanding the applicable electric strength test
`specified in 5.2.2.
`
`Where a power supply cord, whose insulating properties comply with those of the cord types
`0f3.2,5,
`is used inside the equipment. either as an extension of the external power supply
`cord or as an independent cable, the sheath of the power supply cord is considered to be
`adequate SUPPLEMENTARY INSULATION for the purpose of 3.1.4.
`
`NOTE Requirements regarding colours of insulation are in 2.5.3.5.
`
`Compliance is checked by inspection and evaluation of test data showing that the insulation
`withstands the relevant test voltage.
`
`If such applicable test data is not available, compliance is checked by applying the electric
`strength test using a sample of approximately 1 m in length and by applying the relevant test
`voltage as follows:
`
`— for insulation of a conductor: by the voltage test method given in Clause 3 of ”EC 60885—1,
`using the relevant test voltage in 5.2.2 in this standard for the grade of insulation under
`consideration; and
`
`— for SUPPLEMENTARY lNSULATlON (for example, sleeving around a group of conductors):
`between a conductor inserted into the sleeve and metal foil wrapped tightly round the
`sleeve for a length ofat least 100 mm.
`
`3.1.5 Beads and ceramic insulators
`
`Beads and similar ceramic insulators on conductors shall:
`
`,
`
`—
`
`be so fixed or supported that they cannot change their pesition in such a way that a
`hazard would be created; and
`
`not rest on sharp edges or sharp corners.
`
`if beads are located inside flexible metal conduits, they shall be contained within an insulating
`sleeve, unless the conduit is mounted or secured in such a way that movement in normal use
`would not create a hazard.
`
`Compliance is checked by inspection and, where necessary, by the following test.
`
`A force of 10 N is applied to the insulators or to the conduit. The resulting movement, it any,
`shall not create a hazard in the meaning of this standard.
`
`3.1.6 Screws for electrical contact pressure
`
`Where electrical contact pressure is required. a screw shall engage at least two complete
`threads into a metal plate, a metal nut or a metal insert.
`
`including
`insulating material shall not be used where electrical connections,
`Screws of
`protective earthing, are involved, or where their replacement by metal screws could impair
`SUPPLEMENTARY INSULATlON or REINFORCED INSULATION.
`
`Where screws of insulating material contribute to other safety aspects, they shall be engaged
`by at least two complete threads.
`
`NOTE See also 2.5.5.? for screws used for protective earthing continuity.
`
`Page 126 of 648
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`

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`
`3.1.7
`
`insulating materials in electrical connections
`
`Electrical connections, including those for protective earthing functions (see 2.6), shall be so
`designed that contact pressure is not transmitted through insulating material unless there is
`sufficient
`resilience in the metallic parts to compensate for any possible shrinkage or
`distortion of the insulating material.
`
`Compliance is checked by inspection.
`
`3.1.8 Self-tapping and spaced thread screws
`
`Spaced thread (sheet metal) screWs shall not be used for the connection of current—carrying
`parts, unless they clamp these parts directly in contact with each other and are provided with
`a suitable means of locking.
`
`Self-tapping (thread-cutting or thread-forming) screws shall not be used for the electrical
`connection of current-carrying parts, unless they generate a full form standard machine screw
`thread. Moreover, such screws shall not be used if they are operated by the USER or installer
`unless the thread is formed by a swaging action.
`
`NOTE See also 2.6.5.? for screws used for protective eartbing continuity.
`
`Compliance is checked by inspection.
`
`3.1.9 Termination of conductors
`
`fixing), or be so
`Conductors shall be provided with a means (for example, barriers or
`terminated, that they and their terminators (for example. ring terminals and flat quick-connect
`terminals) cannot,
`in normal use, become so displaced that CLEARANCES or CREEPAGE
`DISTANCES are reduced below the values specified in 2.10 (or Annex (3).
`
`it is permitted to use soldered, welded, crimped, screwiess (push~in) and similar terminations
`for the connection of conductors. For soldered terminations, the conductor shall be positioned
`or fixed so that reliance is not placed upon the soldering alone to maintain the conductor in
`position,
`
`In multiway plugs and sockets, and wherever shorting could otherwise occur. means shall be
`provided to prevent contact between parts in SELV CIRCUITS or TNV ClRCUlTS and parts at
`HAZARDOUS VOLTAGE due to loosening of a terminal or breaking of a wire at a termination.
`
`Compliance is checked by inspection, by measurement and, where necessary, by the
`following last.
`
`A force of 10 N is applied to the conductor near its termination point. The conductor shall not
`break away or pivot on its terminal to the extent that CLEARANCES or CREEPAGE DISTANCES are
`reduced below the values specified in 2.10 (or Annex G).
`
`For the purpose of assessing compliance it is assumed that:
`
`— two independent fixings will not become loose at the same time; and
`
`— parts fixed by means of screws or nuts provided with self—locking washers or other means
`of locking are not liable to become loose.
`
`NOTE Spring washers and the like can provide satisfactory locking.
`
`Examples of constructions regarded as meeting the requirements include:
`
`a close-fitting tubing (for example, a heat shrink or rubber sleeve), applied over the wire and
`
`Page 127 of 648
`
`

`

`— 126 —
`
`60950-1 © |EC:2005+A1:2009
`+A2.'2013
`
`— conductors connected by soldering and held in place near
`independently of the soldered connection;
`
`to
`
`the
`
`termination,
`
`w conductors connected by soldering and "hooked in " before soldering, provided that the
`hole through which the conductor is passed is not unduly large;
`
`— conductors connected to screw terminals, with an additional fixing near to the terminal that
`clamps, in the case of stranded conductors, the insulation and not only the conductors;
`
`— conductors connected to screw terminals and provided with terminators that are unlikely to
`become free (for example, ring lugs crimped onto the conductors). The pivoting of such
`terminators is considered;
`
`— short rigid conductors that remain in position when the terminal screw is loosened.
`
`3.1.10
`
`Sleeving on wiring
`
`Where sleeving is used as SUPPLEMENTARY INSULATION on internal wiring.
`in position by positive means.
`
`it shall be retained
`
`Compliance is checked by inspection.
`
`Examples of constructions that are considered to meet the intent of this requirement include:
`
`— sleeving that can be removed only by breaking or cutting of either the wiring or sleeving;
`
`fl
`
`sleeving that is clamped at both ends;
`
`— heat shrinkable sleeving that tightens against the wire insulation;
`
`— sleeving that is of such length that it will not slip.
`
`3.2 Connection to a mains supply
`
`3.2.1 Means of connection
`
`3.2.1.1
`
`Connection to an a.c. mains supply
`
`For safe and reliable connection to an AC MAINS SUPPLY, equipment shall be provided with one
`of the following:
`
`e
`
`terminals for permanent connection to the supply;
`
`7
`
`a NON-DETACHABLE POWER SUPPLY CORD for permanent connection to the supply. or for
`connection to the supply by means of a plug;
`NOTE In many countries. it is a legal requirement to provide a plug that complies with the national wiring rules.
`
`—
`
`—
`
`an appliance inlet for connection of a DETACHABLE POWER SUPPLY CORD:
`
`a mains plug that is part of DIRECT PLUG—EN EQUIPMENT.
`
`Compliance is checked by inspection.
`
`3.2.1.2 Connection to a d.c. mains supply
`
`For safe and reliable connection to a Dc MAINS SUPPLY, equipment shall be provided with one
`of the following:
`
`—
`
`7
`
`—
`
`terminals for permanent connection to the supply;
`
`a NON—DETACHABLE POWER SUPPLY CORD for permanent connection to the supply, or for
`connection to the supply by means of a plug;
`
`an appliance inlet for connection of a DETACHABLE POWER SUPPLY CORD.
`
`Page 128 of 648
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`

`

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`+A2:2013
`
`~127 —
`
`Plugs and appliance inlets shall not be of a type that is used for AC MAINS SUPPLIES if a hazard
`could be created by their use. Plugs and appliance inlets shall be so designed that reverse
`polarity connections are prevented if a hazard could be created by such connection.
`
`is permitted for one pole of the DC MAENS SUPPLY to be connected both to an equipment
`It
`mains input terminal and to the main protective earthing terminal of the equipment.
`if any,
`provided the equipment installation instructions detail the proper earthing for the system.
`
`Compliance is checked by inspection.
`
`3.2.2 Multiple supply connections
`
`if equipment is provided with more than one supply connection (for example, with different
`voltages or frequencies or as backup power), the design shall be such that all of the following
`conditions are met:
`
`,
`
`,
`
`—
`
`separate means of connection are provided for different circuits: and
`
`supply plug connections.
`incorrect plugging; and
`
`if any, are not interchangeable if a hazard could be created by
`
`bare parts of an ELV CIRCUIT or parts at HAZARDOUS VOLTAGES, such as plug contacts, are
`not accessible to an OPERATOR when one or more connectors are disconnected.
`
`Compliance is checked by inspection and for accessibility, where necessary, by a test with the
`test finger, Figure 2A (see 2.1.1.1).
`
`3.2.3 Permanently connected equipment
`
`PERMANENTLY CONNECTED EQUIPMENT shall be provided with either:
`
`—
`—
`
`a set of terminals as specified in 3.3; or
`a NON-DETACHABLE POWER SUPPLY CORD.
`
`PERMANENTLY CONNECTED EQUIPMENT having a set of terminals shall:
`
`—
`
`—
`
`permit the connection of the supply wires after the equipment has been fixed to its
`suppon;and
`
`be provided with cable entries, conduit entries, knock—outs or glands, which allow
`connection of the appropriate types of cables or conduits.
`
`the cable entries shall be
`For equipment having a RATED CURRENT not exceeding 16A,
`suitable for cables and conduits having an overall diameter as shown in Table 3A.
`
`Conduit and cable entries and knock-outs for supply connections shall be so designed or
`located that the introduction of the conduit and cable does not affect the protection against
`electric shock. or reduce CLEARANCES and CREEPAGE DISTANCES below the vaiues specified
`in 2.10 (or Annex G).
`
`Compliance is checked by inspection, by a practical installation test and by measurement.
`
`Page 129 of 648
`
`

`

`— 128 —
`
`609504 © lEC:2005+A1:2009
`+A2i20’13
`
`Table 3A — Sizes of cables and conduits for equipment having
`a rated current not exceeding 16 A
`
`Number of conductors,
`including the
`PROTECTIVE EARTHING CONDUCTOR
`where provided
`
`Overall diameter
`mm
`
`conduits.
`
`15,0 (22,2)
`15.0 (22,2)
`20,0 (27,5)
`20,0 (27‘s)
`NOTE In Canada and the United States the dimensions in parentheses are the size of
`conduit opening required for terminating nominal 112 inch and 3M inch trade size
`
`3.2.4 Appliance inlets
`
`Appliance inlets shall meet all of the following:
`
`—
`
`—
`
`2
`
`be so located or enclosed that parts at HAZARDOUS VOLTAGE are not accessible during
`insertion or removal of the connector (appliance inlets complying with lEC 50309 or with
`lEC 60320 are considered to comply with this requirement); and
`
`be so located that the connector can be inserted without difficulty; and
`
`be so located that, after insertion of the connector, the equipment is not supported by the
`connector for any position of normal use on a flat surface.
`
`for accessibility, by means of the test finger,
`
`Compliance is checked by inspection and,
`Figure 2A (see 2.1.1.1).
`
`NOTE For Switzerland, see 3.2.1.1 Note.
`
`3.2.5 Power supply cords
`
`3.2.5.1 AC power supply cords
`
`.-
`
`-
`
`..ee
`
`.= e
`
`2
`
`.e--:.
`
`:-
`
`=
`
`-: --
`
`-
`
`-
`
`AMAINS SUPPLY cord shall be
`
`
`
`of the sheathed type and comply with the following as appropriate:
`
`-
`
`,
`
`if rubber insulated- sheathed, be of synthetic rubber and not lighter than ordinary tough
`rubber—sheathed flexible cord according to IEC 60245-1 (designation 50245 lEC 53);
`if PVC insulated sheathed:
`
`-
`
`-
`
`for equipment provided with a NON-DETACHABLE POWER SUPPLY CORD and having a
`mass not exceeding 3kg, be not
`lighter
`than light PVC sheathed flexible cord
`according to lEC 60227-12007 (designation 60227 lEC 52);
`
`for equipment provided with a NON-DETACHABLE POWER SUPPLY CORD and having a
`mass exceeding 3kg, be not
`tighter
`than ordinary PVC sheathed flexible cord
`according to lEC 60227—12007 (designation 60227 lEC 53);
`
`NOTE 1 There is no limit on the mass of the equipment if the equipment is intended for use with a DETACHABLE
`POWER SUPPLY cone.
`
`I
`
`-
`
`for equipment provided with a detachable power supply cord, be not lighter than light
`PVC sheathed flexible cord according to [EC 60227-12007 (designation 60227 lEC
`52);
`
`
`
`Page 130 of 648
`
`

`

`60950-1 © IEC:2005+A1:2009
`+A2:2013
`
`— 129 —
`
`
`
`-
`
`cords
`screened
`for
`IEC 60227-221997;
`
`of moveable
`
`equipment.
`
`the
`
`flexing
`
`test
`
`of
`
`3.1
`
`of
`
`NOTE 2 Although screened cords are not covered in the scope of IEC 60227-2,
`IEC 60227-2 are used.
`
`the relevant flexing tests of
`
`—
`
`other types of cords may be used if they have similar or better eiectro-mechanical and fire
`safety properties as above.
`
`NOTES Where national or regional standards exist.
`paragraph
`
`they can be used to show compliance with the above
`
`For equipment required to have protective earthing. a PROTECTIVE EARTHING CONDUCTOR shall
`be included in the MAINS SUPPLY cord.
`
`A MAINS SUPPLY cord shall have conductors with a cross-sectional area not less than those
`
`specified in Table SB.
`
`Compliance is checked by inspection. For screened cords, damage to the screen is
`acceptable provided that:
`
`—
`
`—
`
`during the flexing test the screen does not make contact with any conductor, and
`
`after the flexing test, the sample withstands the appropriate electric strength test between
`the screen and all other conductors.
`
`Page 131 of 648
`
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`

`— 130 —
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`60950—1 © |EC:2005+A1:2009
`+A222013
`
`Over
`Over
`
`Table 3B — Sizes of conductors
` Minimum conductor sizes
`
`
`
`
`AWG or kcmil
`
`Nominal
`RATED CURRENT of equipment
`
`
`
`[cross-sectional area
`A
`cross—sectional area
`
`in mmz]
`
`
`see Note 2
`mm2
`
`
`
` Up to and including 6
`
`6 up to and including
`‘10
` (0,75) b
`
`13
`10 up to and including
`(1.0) °
`
`
`(1.0) “
`13 up to and including
`16
`Over
`
`
`
` Over 15 up to and including 25
`
`
`
`
`
` Over 25 up to and including 32
`
`
` Over 32 up to and including 40
`
` Over 40 up to and including 63
`
`
` Over 63 up to and including 80
`
` Over 80 up to and including 100
` Over 100 up to and including 125
` Over 125 up to and including 150
`Over 160 up to and including 190
`
`Over 190 up to and including 230
`
`
`
` 250 kcmii [125]
`Over 230 up to and including 260
`
`300 kcmii
`[1521
`Over 250 up to and including 300
`
`
`Over 300 up to and including 340
`
`Over 340 up to and including 400
`Over 400 up to and including 460
`
`400 kcmil
`500 kcmil
`
`600 kcrnil
`
`[202]
`[253]
`
`[3041
`
`
`
`
`
`NOTE 1
`IEC 60320 specifies acceptable combinations of appliance couplers and flexible cords. including
`
`
`
`those covered by Footnotes a, b and c above. However, several countries have indicated that they do not
`
`accept all of the values listed in Table SB, particularly those covered by Footnotes a, b and c above.
`NOTE 2 AWG and kcmil sizes are provided for information only. The associated cross-sectional areas. in
`square brackets have been rounded to show significant figures only. AWG refers to the American Wire
`
`Gage and the term "cmil" refers to circular mils where 1 cmil
`is the area of a circle having a diameter of
`1 mil
`(one thousandth of an inch). These terms are commonly used to designate wire sizes in North
`
`America.
`
`
`a For RATED CURRENT up to 3 A. a nominal cross-sectional area of 0,5 mm2 is permitted in some countries
`
`
`
`provided that the length of the cord does not exceed 2 rn.
`
`
`not exceed 2 m.
`
`
`
`
`b The value in parentheses applies to DETACHABLE POWER SUPPLY cones fitted with the connectors rated 10 A
`in accordance with lEC 60320 (types 013. C115, 015A and {317) provided that the length of the cord does
`
`The value in parentheses applies to DETACHABLE POWER SUPPLY cones fitted with the connectors rated 16 A
`
`in accordance with IEC 60320 (types (319‘ C21 and C23) provided that the length of the cord does not
`
`exceed 2 rn.
`
`
`3.2.5.2 DC power supply cords
`
`A power supply cord for connection to the DC MAINS SUPPLY shall be suitable for the voltage,
`current and the physical abuses it is likely to encounter.
`
`Compliance is checked by inspection.
`
`3.2.6 Cord anchorages and strain relief
`
`For equipment with a NON—DETACHABLE POWER SUPPLY CORD, a cord anchorage shall be
`
`Page 132 of 648
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`

`

`60950-1 ©1EC:2005+A1:2009
`+A222013
`
`— 131 —
`
`—
`
`—
`
`the connecting points ofthe cord conductors are relieved from strain. and
`
`the outer covering of the cord is protected from abrasion.
`
`It shall not be possible to push the cord back into the equipment to such an extent that the
`cord or its conductors, or both, could be damaged or internal parts of the equipment could be
`displaced.
`
`For NON-DETACHABLE POWER SUPPLY CORDs containing a PROTECTIVE EARTHING CONDUCTOR, the
`construction shall be such that if the cord should slip in its anchorage, placing a strain on
`conductors, the PROTECTIVE EARTHING CONDUCTOR will be the last to take the strain.
`
`The cord anchorage shall either be made of insulating material or have a lining of insulating
`material complying with the requirements for SUPPLEMENTARY INSULATION. However, where the
`cord anchorage is a bushing that
`includes the electrical connection to the screen of a
`screened power cord,
`this
`requirement shall not apply. The construction of
`the cord
`anchorage shall be such that:
`
`—
`
`—
`
`cord replacement does not impair the safety of the equipment: and
`
`for ordinary replacement cords. it is clear how relief from strain is to be obtained: and
`
`— the cord is not clamped by a screw that bears directly on the cord, unless the cord
`anchorage,
`including the screw,
`is made of
`insulating material and the screw is of
`comparable size to the diameter of the cord being clamped; and
`
`— methods such as tying the cord into a knot or tying the cord with string are not used; and
`
`—
`
`the cord cannot rotate in relation to the BODY of the equipment to such an extent that
`mechanical strain is imposed on the electrical connections.
`
`Compliance is checked by inspection and by applying the following tests that are made with
`the type of power supply cord supplied with the equipment.
`
`The cord is subjected to a steady pull of the value shown in Tabie'3C, applied in the most
`unfavourable direction. The test is conducted 25 times, each time for a duration of? s.
`
`the power supply cord shall not be damaged. This is checked by visual
`During the tests,
`inspection, and by an electric strength test between the power cord conductors and
`accessible conductive parts, at the test voltage appropriate for REINFORCED lNSULATiON.
`
`the power supply cord shall not have been longitudinally displaced by more
`After the tests,
`than 2 mm nor shall there be appreciable strain at the connections, and CLEARANCES and
`CREEPAGE DISTANCES shall not be reduced below the values specified in 2.10 (or Annex G).
`
`Table SC — Physical tests on power supply cords
`
`
`Mass (M) of the equipment
`kg
`
`
`Up to and including 1
`
`60
`Overt up to and including 4
`
`
`Over 4
`100
`
`
`
`
`3.2.7 Protection against mechanical damage
`
`Power supply cords shall not be exposed to sharp points or cutting edges within or on the
`surface of the equipment, or at the inlet opening or inlet bushing.
`
`Page 133 of 648
`
`

`

`w 132 _
`
`60950-1 © IECIZOOS+A1ZZOOQ
`+A2:2013
`
`The overall sheath of a NON-DETACHABLE POWER SUPPLY CORD shall continue into the
`equipment through any inlet bushing or cord guard and shall extend by at least half the cord
`diameter beyond the clamp ofthe cord anchorage.
`
`Inlet bushings. where used, shall
`
`—
`—
`
`be reliably fixed, and
`not be removable without the use of a TOOL.
`
`A metallic inlet bushing shall not be used in a non-metallic ENCLOSURE.
`
`An inlet bushing or cord guard secured to a conductive part that is not protectively earthed
`shall meet the requirements for SUPPLEMENTARY INSULATION.
`
`Compliance is checked by inspection and measurement.
`
`3.2.8 Cord guards
`
`A cord guard shall be provided at the power supply cord inlet opening of equipment that has a
`NDN-DETACHABLE POWER SUPPLY CORD, and which is HAND-HELD EQUIPMENT or iS intended to be
`moved while in operation. Alternatively, the inlet or bushing shall be provided with a smoothly
`rounded bell-mouthed opening having a radius of curvature equal to at least 150 % of the
`overall diameter of the cord with the largest cross-sectional area to be connected.
`
`Cord guards shall
`
`a
`
`—
`
`—
`
`—
`
`be so designed as to protect the cord against excessive bending where it enters the
`equipment,
`
`be of insulating material,
`
`be fixed in a reliable manner, and
`
`project outside the equipment beyond the inlet opening for a distance of at least five times
`the overall diameter or, for flat cords, at least five times the major overall cross-sectional
`dimension of the cord.
`
`Compliance is checked by inspection, by measurement and, where necessary, by the
`following test with the cord as deliVered with the equipment.
`
`The equipment is so placed that the axis of the cord guard, where the cord leaves it, projects
`at an angle of 45° when the cord is free from stress. A mass equal to 10 xng is then
`attached to the free end of the cord, where D is the overall diameter of, or for flat cords, the
`minor overall dimension of the cord, in millimetres,
`
`If the cord guard is of temperature-sensitive material, the testis made at 23 "C i 2 “C.
`
`Flat cords are bent in the plane ofleast resistance.
`
`immediately after the mass has been attached,
`nowhere be less than 1,5 D.
`
`the radius of curvature of the cord shall
`
`3.2.9 Supply wiring space
`
`The supply wiring space provided inside, or as part of, the equipment for permanent connection or
`for connection of an ordinary NON~DETACHABLE POWER SUPPLY CORD shall be designed:
`
`a
`
`to allow the conductors to be introduced and connected easily; and
`
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`—
`
`so that the uninsulated end of a conductor is unlikely to become free from its terminal, or,
`should it do so, cannot come into contact with:
`
`-
`
`a
`
`an accessible conductive part that is not protectively earthed; or
`
`an accessible conductive part of HAND—HELD EQUIPMENT; and
`
`e
`
`—
`
`—
`
`to permit checking before fitting the cover,
`connected and positioned; and
`
`if any,
`
`that
`
`the conductors are correctly
`
`if any, can be fitted without risk of damage to the supply conductors or
`so that covers,
`their insulation; and
`
`so that covers,
`available TOOL.
`
`if any, giving access to the terminals can be removed with a commonly
`
`Compliance is checked by inspection and by an installation test with cords of the largest
`cross—sectional area of the appropriate range specified in 3.3.4.
`
`3.3 Wiring terminals for connection of external conductors
`
`3.3.1 Wiring terminals
`
`PERMANENTLY CONNECTED EQUIPMENT and equipment with ordinary NON—DETACHABLE POWER
`SUPPLY CORDS shall be provided with terminals in which connection is made by means of
`screws, nuts or equally effective devices (see also 2.6.4).
`
`Compliance is checked by inspection.
`
`3.3.2 Connection of non-detachable power supply cords
`
`the connection of the
`For equipment with special NON~DETACHABLE POWER SUPPLY coacs,
`individual conductors to the internal wiring of the equipment shall be accomplished by any
`means that will provide a reliable electrical and mechanical connection without exceeding
`the permitted temperature limits while the equipment
`is operated under NORMAL LOAD
`(see also 3.1.9).
`
`Compliance is checked by inspection and by measuring the temperature of the connection
`which shall not exceed the values of 4.5.3, Table 45.
`
`3.3.3 Screw terminals
`
`Screws and nuts that clamp external MAth SUPPLY conductors shall have a thread conforming
`to lSO 261 or ISO 262, or a thread comparable in pitch and mechanical strength (for example,
`unified threads). The screws and nuts shall not serve to fix any other component, except that
`they are permitted also to clamp internal conductors provided that the internal conductors are
`so arranged that they are unlikely to be displaced when fitting the supply conductors. For
`protective earthing terminals and protective bonding terminals, see also 2.6.4.2.
`
`The terminals of a component (for example, a switch) built into the equipment are permitted
`for use as terminals for external MAINS SUPPLY conductors, provided that they comply with the
`requirements of 3.3.
`
`Compliance is checked by inspection.
`
`3.3.4 Conductor sizes to be connected
`
`Terminals shall allow the connection of conductors having nominal cross-sectional areas as
`shown in Table 3D.
`
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`

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`
`609504 © |EC:2005+A1:2009
`+A2:2013
`
`Compliance is checked by inspection, by measurement and by fitting cords of the smallest
`and largest cross-sectional areas of the appropriate range shown in Table 30.
`
`Table SD — Range of conductor sizes to be accepted by terminals
`
`Nominal cross-sectional area
`
`RATED CURRENT of equipment
`A
`
`mm2
`Flexible cords
`Other cables
`
`Over 32 up to and including 40 Over 40 up to and Including 63
`
`3
`Up to and including
`3 up to and including 6
`
`Over
`
`6 up to and including 10
`Over
`Over 10 up to and including 13
`Over 13 up to and including 16
`Over 15 up to and including 25
`Over 25 up to and including 32
`
`3.3.5 Wiring terminal sizes
`
`Pillar, stud or screw type terminals shall comply with the minimum sizes in Table 3E.
`
`Compliance is checked by inspection and measurement.
`
`Table 3E — Sizes of terminals for mains supply conductors
`and protective earthing conductors a
`
`
`
`
`
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`+A2i2013
`
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`
`RATED CURRENT
`A
`.
`.
`"P to and "‘6'“de
`
`Conductor size
`2
`mm
`
`Minimum nominal thread
`'
`diameter
`mm
`
`Pillar type or
`stud type
`3.0
`
`Screw type
`
`b
`
`3.5
`
`Area of cross section
`2
`
`mm
`
`Pillar type or
`stud type
`7
`
`Screw type "
`
`9,6
`
`IEC 60999-2.
`
`
`
`'
`
`“
`
`This table is also used for the sizes of terminals for PROTECTIVE BONDING CONDUCTORS if specified in
`2.6.4.2.
`
`"Screw type" refers to a terminal that clamps the conductor under the head of a screw. with or without a
`washer
`
`° As an alternative to the requirements of this table, the protective earthing conductor may be attached to
`special connectors. or suitable clamping means (for example. an upturned spade or closed loop pressure
`type; clamping unit type; saddle clamping unlt type; mantle clamping unit type; etc.) that is secured by a
`screw and nut mechanism to the metal chassis of the equipment, The sum of the cross-sectional areas of
`the screw and the nut shall not be less than three times the cross-sectional area of the conductor size in
`Table 20 or Table SB as applicable. The terminals shall comply with lEC 609954 and IEC 60999—1 or
`
`3.3.6 Wiring terminal design
`
`Wiring terminals shall be so designed that they clamp the conductor between metal surfaces
`with sufficient contact pressure and without damage to the conductor.
`
`Terminals shall be so designed or located that
`clamping screws or nuts are tightened.
`
`the conductor cannot slip out when the
`
`Terminals shall be provided with appropriate fixing hardware for the conductors (for example,
`nuts and washers).
`
`Terminals shall be so fixed that, when the means of clamping the conductor is tightened or
`loosened. all of the following apply:
`
`—
`
`—
`
`—
`
`the terminal itself does not work loose;
`
`internal wiring is not subjected to stress; and
`
`CLEARANCES and CREEPAGE DISTANCES are not reduced below the values specified in 2.10
`(or Annex G).
`
`Compliance is checked by inspection and measurement.
`
`3.3.7 Grouping of wiring terminals
`
`PERMANENTLY CONNECTED
`For ordinary NON-DETACHABLE POWER SUPPLY CORDS and for
`EQUIPMENT, all associated AC MAINS SUPPLY terminals shall be located in proximity to each
`other and to the main protective earthing terminal, if any.
`
`PERMANENTLY CONNECTED
`For ordinary NONrDETACHABLE POWER SUPPLY CORDS and for
`EQUIPMENT. all associated DC MAINS SUPPLY terminals shall be located in proximity to each
`other. They need not be located in proximity to the main protective earthing terminal,
`if any.
`
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`60950—1©|EC:2005+A1:2009
`+A2:2013
`
`Compliance is checked by inspection.
`
`3.3.8 Stranded wire
`
`The end of a stranded conductor shall not be consolidated by soft soldering at places where
`the conductor is subject to contact pressure unless the method of clamping is designed so as
`to reduce the [ikelihood of a bad contact due to cold flow of the solder.
`
`Spring terminals that compensate for the cold flow are deemed to satisfy this requirement.
`
`Preventing the clamping screws from rotating is not considered to be adequate.
`
`insulated so that. should a strand of a flexible
`Terminals shall be located. guarded or
`conductor escape when the conductor is fitted, there is no likelihood of accidental contact
`between such a strand and
`
`—
`
`7
`
`accessible conductive parts, or
`
`parts
`conductive
`unearthed
`SUPPLEMENTARY INSULATION only.
`
`separated
`
`from accessible
`
`conductive
`
`parts
`
`by
`
`Compliance is checked by inspection and, unless a special cord is prepared in such a way as
`to prevent the escape of strands, by the following test.
`
`A piece of insulation approximately 8 mm long is removed from the end of a flexible conductor
`having the appropriate nominal cross-sectional area. One wire of the stranded conductor is
`left free and the other wires are fully inserted into, and clamped in the terminai.
`
`the free wire is bent in every possible direction, but
`Without tearing the insulation