UL 858 对UL 758 的要求修订

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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.

10.8 Internal wiring composed of insulated conductors shall comply with the Standard for Appliance
Wiring Material, UL 758 and shall have a flame rating of VW1.

Exception No. 1: Insulated conductors need not comply with UL 758， if they comply with one of the
following:
+ u& U: {- M& }7 Ja) The Standard for Thermoset-Insulated Wires and Cables, UL 44;
b) The Standard for Thermoplastic-Insulated Wires and Cables, UL 83; or
c) The applicable UL standard for other insulated conductor types specified in Wiring Methods
5 D2 p+ t  U1 Kand Materials, of the National Electrical Code, NFPA 70.

Exception No. 2: Insulated conductors for specialty applications (e.g. data processing or communications)
and located in a low-voltage circuit not involving the risk of fire, electric shock, or injury to persons need
* g4 z+ c, W8 w# `; ^: Znot comply with UL 758.

Exception No. 3: Wiring in the appliance does not need to be VW-1 if all of the following criteria are met:

a) Wire insulation consists of silicone or inorganic materials with glass or aramid braid fiberous
covering. [For reference, examples UL Style 3251, 3257, 5420]

b) Conductors shall be stranded copper wire having a 600 Vac minimum insulation rating for
8 [/ u& w4 Q& `6 shigh voltage circuits and having a 300 Vac insulation rating for low voltage circuits. Maximum
5 _  ?6 \" h# S; Z% n. u6 ~6 Tcurrent rating would be based on Table 10.1.

, w( c  @3 x" R' ]& c( ^

0 Z5 ?; O3 T0 H- k( [% Kc) The product is compliant to 77A for all electrical connections that involve internal wire not
+ v7 A9 v) s& p& ]4 |0 e+ prated VW-1.

: V$ o( G1 {6 h4 D% ^; m

其中,

问题1:

% d) Y6 t' e% B

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

2 N2 f- _* a8 b6 B5 m