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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.
% r, V x$ a: e( h+ H10.8 Internal wiring composed of insulated conductors shall comply with the Standard for Appliance5 c; U6 P1 U/ Q* Y
Wiring Material, UL 758 and shall have a flame rating of VW1.
( \8 F* Z! A! x7 b6 G; ~) N 3 m+ e' y( x4 E" Q! v) `0 W& P v* {
Exception No. 1: Insulated conductors need not comply with UL 758， if they comply with one of the
b# S2 }+ A8 l ~: h$ X s- rfollowing:
, S7 W5 l C# I. I: s5 r8 ba) The Standard for Thermoset-Insulated Wires and Cables, UL 44;0 O' q; f# w' b+ G
b) The Standard for Thermoplastic-Insulated Wires and Cables, UL 83; or
# r9 u7 Q/ f" y' r6 Dc) The applicable UL standard for other insulated conductor types specified in Wiring Methods L2 }- _' G8 M. C7 y3 Q- T
and Materials, of the National Electrical Code, NFPA 70.1 ~7 L1 S. |. |$ C& t
: W, W" [) r( x. p# fException No. 2: Insulated conductors for specialty applications (e.g. data processing or communications)
3 m0 ]! j. W5 w, [) kand located in a low-voltage circuit not involving the risk of fire, electric shock, or injury to persons need
3 j$ C% {1 V9 Q* qnot comply with UL 758.+ V) A1 O% t/ P5 H
% V& B& D- N( k0 \: m @1 l+ ]Exception No. 3: Wiring in the appliance does not need to be VW-1 if all of the following criteria are met:
_8 E5 n/ }1 R% P/ \. z9 ea) Wire insulation consists of silicone or inorganic materials with glass or aramid braid fiberous
" i. w4 p7 R9 V. D! a- p6 ccovering. [For reference, examples UL Style 3251, 3257, 5420]
/ a- t" x# `# V) f& ]1 t
b) Conductors shall be stranded copper wire having a 600 Vac minimum insulation rating for
f; Z+ r3 J+ T8 i* t7 yhigh voltage circuits and having a 300 Vac insulation rating for low voltage circuits. Maximum0 Z( N" ]/ \9 e0 d
current rating would be based on Table 10.1. / B! P; j) s" w+ h; w
x' h/ @* w; [% `
c) The product is compliant to 77A for all electrical connections that involve internal wire not, C; M1 y3 H4 m
rated VW-1. ; T1 U3 Z# F5 j2 R/ Z( s- G8 o, G S
. K7 ~5 x; j/ m其中,
) V: W7 P" i1 u2 j( Y问题1: % z! Y0 L9 ?, V: t/ }9 R
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( o5 M7 X6 G/ Q. ?
# f8 h1 F/ ^0 z5 ~$ b% y7 y8 `5 {/ V | 
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发表于 2017-11-21 15:44
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