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.

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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.
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Exception No. 1: Insulated conductors need not comply with UL 758， if they comply with one of the
following:
- Q0 k# w# u; k1 |( s* F3 Xa) The Standard for Thermoset-Insulated Wires and Cables, UL 44;
. v4 G$ Q* |' K/ c( eb) 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
+ u& F6 j: ?1 w/ q1 U; a/ Sand 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)
and located in a low-voltage circuit not involving the risk of fire, electric shock, or injury to persons need
4 Y. d- ]: j+ X" V3 m4 N) knot 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:

0 F/ A" @6 e/ U6 t4 }a) Wire insulation consists of silicone or inorganic materials with glass or aramid braid fiberous
covering. [For reference, examples UL Style 3251, 3257, 5420]

2 c3 M6 i' ?" H8 s/ _: _" M6 o; ab) Conductors shall be stranded copper wire having a 600 Vac minimum insulation rating for
+ s# Z. h3 i" l* O4 a7 Xhigh voltage circuits and having a 300 Vac insulation rating for low voltage circuits. Maximum
/ a  P5 o3 Z' l9 [current rating would be based on Table 10.1.

  o7 H0 C( K/ q3 p/ Fc) The product is compliant to 77A for all electrical connections that involve internal wire not
rated VW-1.

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其中,

问题1:

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
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