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UL appliance internal wires 之UL 758 电子线都需要满足 VW-1.從2018-01-01開始執行. 5 s, G* o8 @" u. b
10.8 Internal wiring composed of insulated conductors shall comply with the Standard for Appliance$ M0 K% ?$ M# [& m! ~# P1 q" N
Wiring Material, UL 758 and shall have a flame rating of VW1.
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Exception No. 1: Insulated conductors need not comply with UL 758， if they comply with one of the
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a) The Standard for Thermoset-Insulated Wires and Cables, UL 44;( `- K: T- N1 `
b) The Standard for Thermoplastic-Insulated Wires and Cables, UL 83; or7 F; S9 i& ~/ Q' X: l
c) The applicable UL standard for other insulated conductor types specified in Wiring Methods7 b$ z0 C' h7 h f( @+ _
and Materials, of the National Electrical Code, NFPA 70.% u- K, _( C& U
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Exception No. 2: Insulated conductors for specialty applications (e.g. data processing or communications), D( F) K5 h4 i, ]) S6 Y
and located in a low-voltage circuit not involving the risk of fire, electric shock, or injury to persons need
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Exception No. 3: Wiring in the appliance does not need to be VW-1 if all of the following criteria are met: 0 _. G( S/ ]" U
a) Wire insulation consists of silicone or inorganic materials with glass or aramid braid fiberous( F8 k0 t) V0 Y: P7 U5 b
covering. [For reference, examples UL Style 3251, 3257, 5420]
" d/ i7 h4 j/ @. ?# n' L$ d$ n Gb) Conductors shall be stranded copper wire having a 600 Vac minimum insulation rating for7 @' z \' t# g
high voltage circuits and having a 300 Vac insulation rating for low voltage circuits. Maximum
' G2 y, f+ I4 l) i7 D6 m6 P8 ucurrent rating would be based on Table 10.1.
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c) The product is compliant to 77A for all electrical connections that involve internal wire not
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其中, / l z# J4 |1 c# a, ?+ L
问题1:
8 a1 ?: L0 ~8 G9 K* {5 _7 N 600 Vac minimum insulation rating for high voltage circuits and having a 300 Vac insulation rating for low voltage circuits. 如何理解呢？电线上面只有一个电压等级5 Y5 X2 K4 ~! }; _) s* v' A! Q
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发表于 2017-11-21 15:44
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