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. ! B! d* d0 W/ m2 x1 G; G0 V
10.8 Internal wiring composed of insulated conductors shall comply with the Standard for Appliance
) b; O# `1 c) R% J3 P, j4 [Wiring Material, UL 758 and shall have a flame rating of VW1.7 G) J8 p' {8 d3 Q
5 C }! w/ n3 |4 J" v$ t% dException No. 1: Insulated conductors need not comply with UL 758, if they comply with one of the
' d& k- X# n" T5 M" A7 ^. @following:
! |5 s0 e x( J/ D2 Ia) The Standard for Thermoset-Insulated Wires and Cables, UL 44;
: s7 ^/ S0 R% O; }b) The Standard for Thermoplastic-Insulated Wires and Cables, UL 83; or
* p, v' B1 n' Z1 Q0 u% [, k6 dc) The applicable UL standard for other insulated conductor types specified in Wiring Methods; e8 S. w* g5 D7 s! ?, @% g8 t
and Materials, of the National Electrical Code, NFPA 70.
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Exception No. 2: Insulated conductors for specialty applications (e.g. data processing or communications)
7 i: y. ~2 J qand located in a low-voltage circuit not involving the risk of fire, electric shock, or injury to persons need6 s# w" V- @" ~6 m
not comply with UL 758.
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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: ; N9 q* u" W$ {6 I a+ l) p7 ?
a) Wire insulation consists of silicone or inorganic materials with glass or aramid braid fiberous; V5 O: h9 P2 h# J( n$ E" L O9 u
covering. [For reference, examples UL Style 3251, 3257, 5420] : {& C* T z* i( Q) g' M) P
b) Conductors shall be stranded copper wire having a 600 Vac minimum insulation rating for" F) f: @/ ^+ m1 @) }& M, k
high voltage circuits and having a 300 Vac insulation rating for low voltage circuits. Maximum U5 n/ a" y1 A) |+ r/ \: Z' R- S5 S
current rating would be based on Table 10.1. , E+ a) l# @2 g+ @! b
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c) The product is compliant to 77A for all electrical connections that involve internal wire not
+ B: ^9 A# x' v) Z9 prated VW-1. ( m$ `) U; c' }: e7 k2 {$ v4 d
" X3 V% ]7 ? h, `! l- p其中,
! U% I" I. v0 G1 T* U' K2 T问题1:
, \+ T8 k4 V, F) \, @, s 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, r+ I( |: [0 N+ j! Y
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