— 182 —
`
`60950-1 © IEC:2005+A1:2009
`+A2:2013
`
`—
`
`—
`
`Table 55 using the PEAK WORKING VOLTAGE (U), as determined in 2.10.2; or
`
`Table 50 using the REQUIRED WITHSTAND VOLTAGE, as determined in G.4.
`
`In various places in this standard, special electric strength tests or test voltages are specified for certain
`NOTE 1
`situations. The test voltages in 52.2 do not apply to these situations.
`NOTE 2 For consideration of temporary cvervoltages, see JEC 806644.
`
`it is permitted to use
`For equipment in Overvoltage Categoryl and Overvoltage Category it,
`either Table 5B or Table 50. However, for a SECONDARY CIRCUIT that is neither connected to
`protective earth nor provided with a protective screen in accordance with 2.6.1 9), Table 5C
`shall be used.
`
`For equipment in Overvoltage Category Ill and Overvoltage Category lV, Table SC shall be
`used.
`
`The voltage applied to the insulation under test is gradually raised from zero to the prescribed
`voltage and held at that value for 60 s.
`
`Where, elsewhere in this standard, ROUTINE TESTS are required to be conducted in accordance
`with 5.2.2,
`it is permitted to reduce the duration of the electric strength test to 1 s and to
`reduce the test voltage permitted in Table 50, if used, by 10 %.
`
`There shall be no insulation breakdown during the test.
`
`insulation breakdown is considered to have occurred when the current that flows as a result of
`the application of the test voltage rapidly increases in an uncontrolled manner,
`that is the
`insulation does not restrict the flow of the current. Corona discharge or a single momentary
`fiashover is not regarded as insulation breakdown.
`
`in contact with the insulating surface. This
`insulation coatings are tested with metal foil
`procedure is limited to places where the insulation is likely to be weak, for example, where
`there are sharp metal edges under the insulation.
`lf practicable, insulating linings are tested
`separately, Care is taken that the metal foil is so placed that no tlashover occurs at the edges
`of the insulation. Where adhesive metal foil is used, the adhesive shall be conductive.
`
`To avoid damage to components or insulation that are not involved in the test, disconnection
`of integrated circuits or the like and the use of equipotential bonding are permitted.
`
`For equipment incorporating both REINFORCED lNSULATlON and lower grades ofinsulation, care
`is taken that the voltage applied to the REINFORCED INSULATION does not overstress BASIC
`INSULATION or SUPPLEMENTARY INSULATION.
`
`NOTES Where there are capacitors across the insulation under
`capacitors), it is recommended that do. test voltages are used.
`NOTE 4 Components providing a (1.0. path in parallel with the insulation to be tested, such as discharge resistors
`for filter capacitors, voltage limiting devices or surge suppressors, should be disconnected.
`
`radio—frequency filter
`
`test
`
`(for example,
`
`transformer winding varies along the length of the winding in
`Where insulation of a
`accordance with 2.10.1.5, an electric strength test method is used that stresses the insulation
`accordingly.
`
`NOTE 5 An example of such a test method is an induced voltage test that is applied at a frequency sufficiently
`high to avoid saturation of the transformer. The input voltage is raised to a value that would induce an output
`voltage equal to the specified test voltage.
`
`No test is applied to FUNCTIONAL INSULATION, unless 5.3.4 b) has been selected.
`
`Page 184 of 648
`
`VOLTSERVER EXHIBIT 1023 (part 4 of 11)
`
`

`

`60950—1 © IEC:2005+A1:2009
`+A2i2013
`
`— 183 —
`
`Table SB — Test voltages for electric strength tests
`based on peak working voltages
`Part 1
`
`WORKING VOLTAGE U
`
` Points of application (as appropriate)
`PRIMARY CIRCUIT t0 BODY
`SECONDARY CIRCUIT t0 BODY
`
`
`PRIMARY CIRCUIT to SECONDARY CIRCUIT
`between independent
`
`
`SECONDARY CIRCUITS
`
`
`between parts in PRIMARY CIRCUITS
`
`
`
`
`WORKING VOLTAGE U, peak or d.c.
`
`
`
`Grade of
`Over 42,4 V
`
`Insulation
`peak or
`
`
`Over
`Over
`Over 10 kV
`Up to and
`
`
`
`Up to and
`210 v up
`0"” 420 V
`Up to and
`including
`60 V d'c‘
`1,41 kV up
`
`
`
`
`including
`to and
`IlnpcltgdiIgd
`including
`42,4 V
`:Inpcltgdaigd
`to and
`
`
`
`
`
` 420Vb ‘10ch
`210 V a
`including
`50 kV
`peak or
`10 M! g
`141 ng
`including
`
`
`
` Test voltage. volts a.c. r.m.s.
`
` FUNCTIONAL 1 000 1 500 see Va see V3
`
`
`
`in Table 5B,
`in Table SB,
`‘In Table 58,
`part 2
`part 2
`part 2
`see Ifa
`see Va
`see Va
`BASIC, SUPPLE—
`
`
`
`
`in Table SE,
`MENTARY
`in Table SB,
`in Table SB,
`
`
`
`
`part 2
`part 2
`part 2
`
`
`see l/b
`REINFORCED
`see Vb
`
`In Table SB.
`in Table 58.
`
`part 2
`
`part2
`
`For PEAK WORKING VOLTAGES exceeding 10 kV peak or do.
`in SECONDARY CIRCUITS, the same test voltages as
`
`for PRIMARY CIRCUITS apply.
`
`6 Use this column for unearthed DC MAINS SUPPLIES up to and including 210 V [see 2.10.3.2 (3)],
`b Use this column for unearthed Dc MAINS SUPPLIES over 210 V, up to and including 420 V [see 2103.2 (3)].
`c Use this column for unearthed DC MAINS SUPPLIES over 420 V [see 2.10.3.2 0)].
`
`‘1 Use these columns for do. derived within the equiment from an AC MAINS SUPPLY or for DC MAINS SUPPLIES
`
`that are earthed within the same building.
`
`
`
`
`
`
`Page 185 of 648
`
`

`

`— 184 —
`
`60950-1 © IEC:2005+A1:2009
`+A2:2013
`
`Table SB — Test voltages for electric strength tests
`based on peak working voltages
`Part2
`
`peak
`or d.c.
`
`34
`35
`35
`33
`40
`42
`44
`46
`43
`50
`52
`54
`55
`55
`50
`62
`64
`66
`55
`70
`?2
`74
`75
`15
`50
`85
`90
`95
`100
`105
`110
`115
`120
`125
`130
`135
`140
`145
`150
`152
`a155
`a160
`a155
`3170
`e175
`e130
`“184
`135
`190
`200
`210
`220
`230
`240
`
`Linear interpolation is permitted between the nearest two points.
`
`a At these voltages, the values of Vb are determined by the general curve Vb: 155,86 U546“ and are not 1,6 Va.
`
`
`
`l1111111111111111111111
`
`11111111111111111’
`
`Page 186 of 648
`
`

`

`60950-1 © |EC:2005+A1:2009
`+A2:2013
`
`—— 185 —
`
`Table 5C — Test voltages for electric strength tests
`based on required withstand voltages
`
`
` Test voltage for Fm,
`Test voltage for
`REINFORCED INSULATION
`BASIC INSULATION or
`REQUIRED WITHSTAND VOLTAGE
`
`SUPPLEMENTARY INSULATION
`
`
`
`up to and including
`
`kV peak at: or d.c.
`kV peak
`
`
`
`@735 0,33
`
`
`07550.5
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`
`Linear interpolation is permitted between the nearest two points.
`If FUNCTIONAL INSULATION is tested (as required by 53.4 b), the test voltage for 3 WORKING VOLTAGE up to and
`
`including 42,4 V peak or 60 V dc. shall not exceed 707 V peak or do. For a higher WORKING VOLTAGE, the test
`
`voltage given in Table SB or Table 50 is used.
`
`a U is any REQUIRED WITHSTAND VOLTAGE higher than 12,0 kv.
`
`
`5.3
`
`Abnormal operating and fault conditions
`
`5.3.1
`
`Protection against overload and abnormal operation
`
`Equipment shall be so designed that the risk of fire or electric shock due to mechanical or
`electrical overload or failure, or due to abnormal operation or careless use, is limited as far as
`practicable.
`
`After abnormal operation or a single fault (see 1.4.14), the equipment shall remain safe for an
`OPERATOR in the meaning of this standard, but it is not required that the equipment should still
`be in full working order.
`It
`is permitted to use fusible links, THERMAL CUT-OUTS, overcurrent
`protection devices and the like to provide adequate protection.
`
`Compliance is checked by inspection and by the tests of 5.3. Before the start of each test, it is
`checked that the equipment is operating normally.
`
`if a component or subassembly is so enclosed that short—circuiting or disconnection as
`specified in 5.3 is not practicable or is difficult to perform without damaging the equipment,
`it
`is permitted to make the tests on sample parts provided with special connecting leads. if this
`is not possible or not practical,
`the component or subassembly as a Whole shall pass the
`tests.
`
`Equipment is tested by applying any condition that may be expected in normal use and
`foreseeable misuse.
`
`is tested with the covering
`in addition, equipment that is provided with a protective covering,
`in place under normal idling conditions until steady conditions are established.
`
`Page 187 of 648
`
`

`

`H 186 e
`
`60950—1 © IEC:2005+A1:2009
`+A222013
`
`5.3.2 Motors
`
`Under overload, locked rotor and other abnormal conditions, motors shall not create a hazard
`due to excessive temperatures.
`
`—
`
`NOTE Methods of achieving this include the following:
`—
`the use of motors that do not overheat under locked-rotor conditions (protection by inherent or external
`impedance);
`the use in SECONDARY CIRCUITS of motors that may exceed the permitted temperature limits but that do not
`create a hazard;
`a the use of a device responsive to motor current;
`- the use of an integral THERMAL CUT-OUT;
`— the use of a sensing circuit that disconnects power from the motor in a sufficiently short time to prevent
`overheating if, for example, the motor fails to perform its intended function.
`
`Compliance is checked by the applicable test of Annex 8.
`
`5.3.3 Transformers
`
`Transformers shall be protected against overload, for example, by
`
`—
`
`e
`
`e
`
`overcurrent protection,
`
`internal THERMAL CUT~OUTS, or
`
`use of current limiting transformers.
`
`Compliance is checked by the applicable tests of Clause C. 1.
`
`5.3.4 Functional insulation
`
`For FUNCTIONAL INSULATION, CLEARANCES and CREEPAGE DISTANCES shall satisfy one Of the
`following requirements a) or b) or c).
`
`is
`For insulation between a SECONDARY CIRCUIT and an inaccessible conductive part that
`earthed for functional reasons, CLEARANCEs and CREEPAGE DISTANCES shall satisfy a) or b)
`or c).
`
`the CLEARANCE and CREEPAGE DISTANCE requirements
`a) They meet
`INSULATION in 2.10 (or Annex G).
`
`for
`
`FUNCTIONAL
`
`b) They withstand the electric strength tests for FUNCTIONAL INSULATION in 5.2.2.
`0) They are short-circuited where a short-circuit could cause
`
`-
`
`-
`
`overheating of any material creating a risk of fire, unless the material that could be
`overheated is of V4 CLASS MATERIAL, or
`
`thermal damage to BASIC INSULATION, SUPPLEMENTARY INSULATION or REINFORCED
`INSULATION, thereby creating a risk of electric shock.
`
`Compliance criteria for 5.3.4 o) are in 5.3.9.
`
`5.3.5 Electromechanicalcomponents
`
`Where a hazard is likely to occur, electromechanical components other than motors are
`checked for compliance with 5.3.1 by applying the following conditions:
`
`— mechanical movement shall be locked in the most disadvantageous position while the
`component is energized normally; and
`
`_
`
`in the case of a component that is normally energized intermittently, a fault shall be
`simulated in the drive circuit to cause continuous energizing of the component.
`
`Page 188 of 648
`
`

`

`60950—1 © lEC:2005+A1:2009
`+A222013
`
`_ 187 H
`
`The duration of each test shall be as follows:
`
`— for equipment or components whose failure to operate is not evident to the OPERATOR: as
`long as necessary to establish steady conditions or up to the interruption of the circuit due
`to other consequences of the simulated fault condition, whichever is the shorter; and
`
`—
`
`for other equipment and components: 5 min or up to interruption of the circuit due to a
`failure of the component
`(for example, burn-out) or to other consequences of the
`simulated fault condition, whichever is the shorter.
`
`For compliance criteria see 5.3.9.
`
`5.3.6 Audio amplifiers in information technology equipment
`
`Equipment having audio amplifiers shall be tested in accordance with 4.3.4 and 4.3.5 of
`lEC 60065. The equipment shall be operating normally before the tests are conducted.
`
`5.3.7 Simulation of faults
`
`For components and circuits other than those covered by 5.3.2, 5.3.3, 5.3.5 and 5.3.6,
`compliance is checked by simulating single fault conditions (see 1.4.14).
`
`In Canada and the United States, additional requirements for overloading and other fault simulation for
`NOTE 1
`internal circuit connections apply.
`
`The following faults are simulated.
`
`a) Short—circuit or disconnection of any components in PRIMARY CIRCUITS.
`
`b) Short-circuit or disconnection of any components where failure could adversely affect
`SUPPLEMENTARY lNSULATlON or REINFORCED lNSULA TION.
`
`c) Short-circuit, disconnection or overloading of all relevant components and parts unless
`they comply with the requirements of 4. 7.3.
`NOTE 2 An overload condition is any condition between NORMAL LOAD and maximum current condition up to
`short-circuit.
`
`d) Faults arising from connection of the most unfavourable load impedance to terminals and
`connectors that deliver power from the equipment, other than mains power outlets.
`
`e) Other single faults specified in 1.4.14.
`
`Where there are multiple outlets having the same internal circuitry,
`one sample outlet.
`
`the test is only made on
`
`For components in PRlMARY ClRCUlTS associated with the mains input, such as the supply
`cord, appliance couplers. EMC filtering components, switches and their interconnecting
`wiring, no fault is simulated, provided that the component complies with 5.3.4 a) or 5.3.4 b).
`
`NOTE 3 Such components are still subject to other requirements of this standard where applicable,
`1.5.1, 2.105.413 and 5.2.2.
`
`including
`
`in addition to the compliance criteria given in 5.3.9, temperatures in the transformer supplying
`the component under test shall not exceed those specified in Clause 0.1, and account shall
`be taken of the exception detailed in Clause 6.1 regarding transformers that would require
`replacement.
`
`5.3.8 Unattended equipment
`
`Equipment intended for unattended use and having THERMOSTATS, TEMPERATURE LIMITERs and
`THERMAL CUT-OUTS, or having a capacitor not protected by a fuse or the like connected in
`parallel with the contacts, is subjected to the following tests.
`
`Page 189 of 648
`
`

`

`— 188 —
`
`60950-1 © |EC:2005+A1:2009
`+A2:2013
`
`Equipment is operated under the conditions specified in 4.5.2 and any control that serves to
`limit
`the temperature is short-circuited.
`if the equipment is provided with more than one
`THERMOSTAT, TEMPERATURE LlMlTER or THERMAL CUT—OUT, each is short-circuited, one at a time.
`
`lf interruption of the current does not occur, the equipment is switched off as soon as steady
`conditions are established and is permitted to cool down to approximately room temperature.
`
`'
`
`the
`repeated until
`is
`the test
`intended for continuous operation,
`For equipment not
`temperature has stabilized, regardless of any marking of RATED OPERATlNG TlME or RATED
`RESTlNG TiME. For this test the THERMOSTATS, TEMPERATURE LiMiTERs and THERMAL cur-ours
`are not short-circuited.
`
`lf in any test a MANUAL RESET THERMAL CUT-OUT operates, or if the current is otherwise
`interrupted before the temperature has stabilized,
`the heating period is taken to have ended,"
`but if the interruption is due to the rupture of an intentionally weak part, the test is repeated
`on a second sample. Both samples shall comply with the conditions specified in 5.3.9.
`
`5.3.9 Compliance criteria for abnormal operating and fault conditions
`
`5.3.9.1 During the tests
`
`During the tests of 5.3.4 0), 5.3.5, 5.3.7, 5.3.8 and Clause C. 1:
`
`— ifa fire occurs, it shall not propagate beyond the equipment; and
`
`— the equipment shall not emit molten metal; and
`
`— ENCLOSURES shall not deform in such a way as to cause non—compliance with 2.1.1, 2.6.1,
`2.10.3 (orAnnex G) and 4.4.1.
`
`the temperatures of
`Moreover, during the tests of 5.3.7 0), unless otherwise specified,
`insulating materials other than thermoplastic materials shall not exceed those in Table 5D.
`
`Table 5D — Temperature limits for overload conditions
`
`Maxim um tem peratu re “0
`
`Thermal class
`
`parentheses.
`
`The designations A to H, formerly assigned in IEC 60085 to thermal classes 105 to 180, are given in
`
`if the failure of the insulation would not result in HAZARDOUS VOLTAGE-'8 or HAZARDOUS ENERGY
`LEVELS becoming accessible,
`a maximum temperature of 300 “C is permitted. Higher
`temperatures are permitted for insulation made of glass or ceramic material.
`
`5.3.9.2
`
`After the tests
`
`After the tests of 5.3.4 c), 5.35, 5.3.7 and 5.3.8 and Clause C. 1, an electric strength test
`according to 5.2.2 is made on:
`
`—
`
`—
`
`7
`
`REINFORCED lNSULATiON,' and
`
`BASIC iNSULATlON Oi‘ SUPPLEMENTARY lNSULATlON forming part Of DOUBLE iNSULATiON,‘ and
`
`BASIC iNSULATlON between the PRIMARY ClRCUlT and the main protective earthing terminal;
`
`Page 190 of 648
`
`

`

`609504 © |EC:2005+A1:2009
`+A212013
`
`— 189 —
`
`if any of the following applies:
`
`e
`
`—
`
`—
`
`the CLEARANCE or CREEPAGE DISTANCE has been reduced below the value specified in 2.10
`(orAnnex G); or
`
`the insulation shows visible signs of damage; or
`
`the insulation cannot be inspected.
`
`6 Connection to telecommunication networks
`
`It the equipment is to be connected to a TELECOMMUNECATION NETWORK, the requirements of
`Clause 6 apply in addition to the requirements of Clauses 1 to 5 in this standard.
`
`is assumed that adequate measures according to ITU-T Recommendation Kit have been taken to
`It
`NOTE 1
`reduce the likelihood that the overvoltages presented to the equipment exceed 1,5 kV peak,
`In installations where
`overvoltages presented to the equipment may exceed 1.5 kV peak, additional measures such as surge suppression
`may be necessary.
`NOTE2 Legal
`requirements may exist regarding the connection of
`TELECOMMUNICATLON NETWORK operated by a public network operator.
`NOTE 3
`"he requirements of 2.3.2. 6.1.2 and 6.2 can apply to the same physical insulation or CLEARANCE.
`
`a
`NOTE 4
`"he Ac MAINS SUPPLY system,
`it used as
`a
`communication transmission medium,
`is not
`TELECOMMUNICATION NETWORK (see 1.2.13.8), and Clause 6 does not apply. The other clauses of this standard will
`apply to coupling components, such as signal transformers, connected between the mains and other circuitry. The
`requirements for DOUBLE lNSULATION or RElNFORCED INSULATION will generally apply. See also IEC 60664-1 and
`Annex Z of this standard for overvoEtages to be expected at various points in the Ac MAINS SUPPLY system.
`NOTE 5
`In Canada and the United States, additional requirements apply for TNV CIRcuns for protection from
`overvoltage due to power line cross (telecommunication line contact with a power line),
`induction and earth
`potential rise from power line fault current.
`
`information technology equipment
`
`to a
`
`6.1
`
`Protection of telecommunication network service persons, and users
`of other equipment connected to the network, from hazards in the equipment
`
`6.1.1
`
`Protection from hazardous voltages
`
`Circuitry intended to be directly connected to a TELECOMMUNICATION NETWORK shall comply
`with the requirements for an SELV CIRCUIT or a TNV CIRCUIT.
`
`Where protection of the TELECOMMUNiCATION NETWORK relies on the protective earthing of the
`equipment, the installation instructions and other relevant literature shall state that integrity of
`protective earthing shall be ensured, see also 1.7.2.1.
`
`Compliance is checked by inspection and measurement.
`
`6.1.2 Separation of the telecommunication network from earth
`
`6.1.2.1 Requirements
`
`there shall be insulation between circuitry intended to be
`Except as specified in 6.1.2.2,
`connected to a TELECOMMUNICATION NETWORK and any parts or circuitry that will be earthed in
`some applications, either within the EUT or via other equipment.
`
`Surge suppressors that bridge the insulation shall have a minimum rated operating voltage
`UOp (for example, the sparkover voltage of a gas discharge tube) of
`
`Uop : Upeak + AUsp + AUse
`
`where
`
`Upeak
`
`is one of the following values:
`for equipment intended to be installed in an area where the
`nominal voltage of the AC MAINS SUPPLY exceeds 130 V:
`
`360 V
`
`Page 191 of 648
`
`

`

`— 190 —
`
`60950-1 © lEC:2005+A1:2009
`+A2:2013
`
`AUSp
`
`AUSa
`
`in
`the rated operating voltage due to variations
`the maximum increase of
`is
`component production.
`If this is not specified by the component manufacturer, cusp
`shall be taken as 10 % ot the rated operating voltage of the component.
`
`is the maximum increase of the rated operating voltage due to the component ageing
`over the expected life of the equipment.
`If this is not specified by the component
`manufacturer, AUSa shall be taken as 10 % of the rated operating voltage of the
`component.
`
`NOTE 1
`
`(AU5p + AU“) may be a single value provided by the component manufacturer.
`
`Compliance is checked by inspection and by the following tests. The dimensional and
`construction requirements of 2.10 and Annex (3 do not apply for compliance with 6.1.2.
`
`In Finland, Norway and Sweden. there are additional requirements for the insulation. For the complete
`NOTE 2
`text, see EN 60950-1:2—OQ-X—2006.
`
`insulation is subjected to an electric strength test according to 5.2.2. The ac. test voltage is
`as follows:
`
`— for equipment intended to be installed in an area where the
`nominal AC MAlNS SUPPLY voltage exceeds 130 V:
`
`e for all other equipment:
`
`1,5 kV
`
`1,0 kV.
`
`The test voltages apply whether or not the equipment is powered from the AC MAINS SUPPLY.
`
`Components bridging the insulation that are left in place during electric strength testing shall
`not be damaged. There shall be no breakdown of insulation during electric strength testing.
`
`it is permitted to remove components that bridge the insulation, other than capacitors, during
`electric strength testing.
`
`if this option is chosen, an additional test with a test circuit according to Figure 6A is
`performed with all components in place.
`
`For equipmentpowered from an AC MAlNS SUPPLY, the test is performed with a voltage equal to
`the RATED VOLTAGE of the equipment or to the upper voltage of the RATED VOLTAGE RANGE. For
`equipment powered from a no MAlNS SUPPLY, the test is performed with a voltage equal to the
`highest nominal voltage of the AC MAlNS SUPPLY in the region where the equipment is to be
`used, for example, 230 V for Europe or 120 V for North America.
`
`The current flowing in the test circuit of Figure 6A shall not exceed 10 mA.
`
`Page 192 of 648
`
`

`

`60950-1 © |EC:2005+A1:2009
`+A212013
`
`— 191 —
`
`Components bridging
`the insulation, for example,
`
`surge suppressors
`Connection for
`MAINS SUPPLY
`]
`0
`Connection for
`
`(not connected)
`em. .-
`3 TELECOMUNlCATION
`NETWORK
`(not connected)
`
`Insulation
`
`'
`
`
`
`
`o
`
`I
`
`
`
`EDT
`
`Connection for
`
`protective earth
`or parts or circuitry
`to be connected to
`protective earth
`
`Rated voltage
`
`‘ ._-_____._.. mA . “-7...
`
`.__.i0
`
`5 000 Q
`
`
`rec
`
`1567/05
`
`Figure 6A — Test for separation between a telecommunication network and earth
`
`6.1.2.2 Exclusions
`
`The requirements of6.1.2.1 do not apply to any of the following:
`
`fl
`
`m
`
`,
`
`PERMANENTLY CONNECTED EQUIPMENT Oi" PLUGGABLE EQUIPMENT TYPE B;
`
`intended to be installed by a SERVICE PERSON and has installation
`is
`that
`equipment
`instructions that require the equipment to be connected to a socket-outlet with a protective
`earthing connection (see 6.1.1);
`
`a permanently connected PROTECTIVE EARTHING
`that has provision for
`equipment
`CONDUCTOR and is provided with instructions for the installation of that conductor.
`
`the exclusions are applicable only for PERMANENTLY CONNECTED
`NOTE In Finland, Norway and Sweden,
`EQUIPMENT, PLUGGABLE EQUIPMENT TYPE B and equipment intended to be used in 3 RESTRICTED ACCESS LOCATION
`where equipotential bonding has been appiied,
`for example,
`in a telecommunication centre, and which has
`provision for a permanentiy connected PROTECTIVE EARTHING CONDUCTOR and is provided with instructions for the
`installation of that conductor by a SERVICE PERSON.
`
`6.2
`
`Protection of equipment users from overvoltages on telecommunication
`networks
`
`6.2.1 Separation requirements
`
`separation between a
`Equipment shall provide adequate electrical
`TNV-a CIRCUIT and the following parts of the equipment.
`
`TNV«1 CIRCUIT or a
`
`a) Unearthed conductive parts and non- conductive parts of the equipment expected to be
`held or teaches otherwise maintained in continuous contact with the body during normal
`use (for example a telephone handset a—keybeard—er—the—eehw—exteaer- or headset or the
`palm rest surface of a laptop or notebook computer).
`
`b) Parts and circuitry that can be touched by the test finger, Figure 2A (see 2.1.1.1), except
`contacts of connectors that cannot be touched by the test probe, Figure 20 (see 21.1.1).
`
`0) An SELV CIRCUIT, a TNV—2 CIRCUIT or a LIMITED CURRENT CIRCUIT provided for connection of
`other equipment. The requirement for separation applies whether or not
`this circuit
`is
`accessible.
`
`These requirements do not apply where circuit analysis and equipment investigation indicate
`that adequate protection is assured by other means, for example, between two circuits each
`of which has a permanent connection to protective earth.
`
`Page 193 of 648
`
`

`

`— 192 —
`
`60950-1 © |EC:2005+A1:2009
`+A2:2013
`
`Compliance is checked by inspection and by the tests of 6.2.2. The dimensional and
`constructional requirements of 2. 10 and Annex G do not apply for compliance with 6.2.1.
`
`NOTE The requirements of 2.10 and Annex G may apply for compliance with 2.2 and 2.3. See Footnote e and
`Footnote f of Table 2H.
`
`Connection for
`AC MAINS SUPPLY
`(not connected)
`
`“J
`
`L
`N
`
`PE
`
`
`
`
`
`
`Connection for
`TELECDMUNICATION
`NETWORK
`(not connected)
`
`EUT
`
`/
`Linked for
`
`c) only
`
`handheld parts
`
` *Typical for
`
`
`
`Conductive foil
`
`Test voltage
`
`
`generator
`
`lEC 156265
`
`Figure BB — Application points of test voltage
`
`6.2.2 Electric strength test procedure
`
`Compliance with 6.2.1 is checked by the test of either 6.2.2.1 or 6.2.2.2.
`
`NOTE In Australia, the—teste—ot—both-S—E—QA—and—é-Q—Q—Z—appty- a value of 3 0 W is used for 6.21 a) equipment
`and 1 5 kV for 6 2 1 b) and 6 2 1 c) equipment. These values have been determined considering the low frequency
`induced voltages from the power suppiy distribution system
`
`if a test is applied to a component (see 1.4.3), for example, a signal transformer, which is
`clearly intended to provide the separation required,
`the component shall not be bypassed by
`other components, mounting devices or wiring, unless these components or wiring also meet
`the separation requirements of 6.2.
`
`For the tests, all conductors intended to be connected to the TELECOMMUNICATION NETWORK
`are connected together
`(see Figure 68),
`including any conductors
`required by the
`TELECOMMUNICATlON NETWORK authority to be connected to earth. Similarly, all conductors
`intended to be connected to other equipment are connected together for testing related to
`6.2.1 c).
`
`Non-conductive parts are tested with metal foil in contact with the surface. Where adhesive
`metal foil is used, the adhesive shall be conductive.
`
`Page 194 of 648
`
`

`

`60950-1©IEC:2005+A1:2009
`+A2:2013
`
`— 193 —
`
`6.2.2.1
`
`Impulse test
`
`The electrical separation is subjected to ten impulses of alternating polarity, using the impulse
`test generator reference 1 of Table N. 1, The interval between successive impulses is 60 s and
`U0 is equal to:
`
`— for 6.2.1 a):
`
`2,5 kV; and
`
`— for 6.2.1 b) and 6.2.1 c):
`
`1,5 kV.
`
`NOTE 1 The value of 2,5 M! for 62.1 a) has been chosen primarily to ensure the adequacy of the insulation
`concerned and it does not necessarily simulate likely overvoltages.
`
`NOTE 2
`
`In Australia, a value of UC = 7,0 W is used in 6.2.1 a) for hand-held telephones and for headsets.
`
`6.2.2.2 Steady—state test
`
`The electrical separation is subjected to an electric strength test according to 5.2.2.
`
`The as. test voltage is:
`
`— for 6.2.1 3):
`
`1,5 kl/,' and
`
`— for 6.2.1 b) and 6.2.10):
`
`1,0 RV.
`
`NOTE In Australia, a value of 3,0 M! is used in 6.21 a) for handheld telephones and headsets and 2,5 M! for
`other equipment,
`to simulate lightning surges on typical rural and semi rural network lines. A value of 1,5 l-(V is
`used in 62.1 b) and c).
`
`it is permitted to remove surge suppressors, provided that such
`For 6.2.1 b) and 6.2.1 0),
`devices pass the impulse test of 6.2.2.1 for 6.21 b) and 6.2.1 0) when tested as components
`outside the equipment. For 6.21 a), surge suppressors shall not be removed.
`
`6.2.2.3 Compliance criteria
`
`During the tests of 62.21 and 6.2.22, there shall he no breakdown of insulation.
`
`insulation breakdown is considered to have occurred when the current that flows as a result of
`the application of the test voltage rapidly increases in an uncontrolled manner,
`that is the
`insulation does not restrict the flow of current.
`
`if a surge suppressor operates (or sparkover occurs within a gas discharge tube) during the
`test:
`
`—
`
`—
`
`2
`
`for 6.2.1 a), such operation represents a failure; and
`
`for 6.2.1 b) and 6.2.1 C), such operation is permitted during the impulse test; and
`
`for 6.2.1 b) and 6.2.1c), such operation during the electric strength test (by any surge
`suppressor left in place) represents a failure.
`
`For impulse tests, damage to insulation is verified in one of two ways, as follows:
`
`—
`
`fl
`
`during the application of the impulses, by observation of oscillograms. Surge suppressor
`operation or breakdown through insulation is judged from the shape of an oscillogram.
`
`after application of all the impulses, by an insulation resistance test. Disconnection of
`surge suppressors is permitted while insulation resistance is being measured. The test
`voltage is 500 Vd.c. or,
`if surge suppressors are left in place, a dc. test voltage that is
`10% less than the surge suppressor operating or striking voltage. The insulation
`resistance shall not be less than 2 M9.
`
`NOTE A description of procedures to judge whether a surge suppressor operation or breakdown of insulation has
`occurred, using oscillograms, is given in Annex 8.
`
`Page 195 of 648
`
`

`

`— 194 —
`
`609504 © |EC:2005+A1:2009
`+A212013
`
`6.3
`
`Protection of the telecommunication wiring system from overheating
`
`Equipment intended to provide power over the telecommunication wiring system to remote
`equipment shall
`limit
`the output current
`to a value that does not cause damage to the
`telecommunication wiring system, due to overheating, under any external load condition. The
`maximum continuous current from equipment shall not exceed a current limit that is suitable
`for the minimum wire gauge specified in the equipment installation instructions. The current
`limit is 1,3 A if such wiring is not specified.
`
`NOTE 1 The overcurrent protective device may be a discrete device such as a fuse. or a circuit that performs that
`function.
`
`for which the
`NOTE 2 The minimum wire diameter normally used in telecommunication wiring is 0,4 mm,
`maximum continuous current for a multipair cable is 1,3 A. This wiring is not usually controlled by the equipment
`installation instructions, since the wiring is often installed independent of the equipment installation.
`NOTE 3 Further current limitation may be necessary for equipment intended for connection to networks that are
`subject to overvoltages, due to operating parameters for protective devices.
`
`Compliance is checked as follows.
`
`if current limiting is due to the inherent impedance of the power source, the output current into
`any resistive load,
`including a short-circuit,
`is measured. The current
`limit shall not be
`exceeded after 60 s of test.
`
`limiting is provided by an overcurrent protective device having a specified
`if current
`time/current characteristic:
`
`u
`
`the time/current characteristic shall show that a current equal to 110 % of the current limit
`will be interrupted within 60 min; and
`NOTE 4 Timelcurrent characteristics of type 90 and type gN fuses specified in IEC 80269-2—1 comply with the
`above limit. Type 9D or type gN fuses rated 1 A, would meet the 1,3 A current limit.
`
`—
`
`including a short-circuit, with the overcurrent
`the output current into any resistive load,
`protective device bypassed, measured after 603 of test, shall not exceed 1000/U,
`where U is the output voltage measured in accordance with 1.4.5 with all load circuits
`disconnected.
`
`if current limiting is provided by an overcurrent protective device that does not have a
`specified time/current characteristic:
`
`—
`
`—
`
`the output current into any resistive load,
`current limit after 60 s of test; and
`
`including a short—circuit, shall not exceed the
`
`including a short-circuit, with the overcurreni
`the output current into any resistive load,
`protective device bypassed, measured after 60 s of test, shall not exceed 1 GOO/U, where
`U is
`the output voltage measured in accordance with 1.4.5 with all
`load circuits
`disconnected.
`
`7 Connection to cable distribution systems
`
`7.1
`
`General
`
`the requirements of
`If the equipment is to be connected to a CABLE DISTRIBUTION SYSTEM,
`Clause 7 apply in addition to the requirements of Clauses 1 to 5 of this standard.
`
`NOTE 1 Unless the connection uses coaxial cable, the circuit is not a CABLE DISTRIBUTION SYSTEM, and Clause 6
`applies.
`is assumed that adequate measures have been taken to reduce the likelihood that
`it
`NOTE 2
`overvoltages presented to the equipment exceed the following values:
`e
`10 kV for equipment to be connected only to an outdoor antenna;
`e 4 kV to other equipment, see ITUwT Recommendations K.20, K.21 and K.45.
`in installations where overvoltages presented to the equipment may exceed t