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.
+ ?8 g* ~" f6 B+ n4 h

+ G4 \* s/ y: e. P: }

Exception No. 1: Insulated conductors need not comply with UL 758， if they comply with one of the
: m0 c+ s, Q( |0 r2 S# W" s# ofollowing:
a) The Standard for Thermoset-Insulated Wires and Cables, UL 44;
* P/ ?4 a0 m! o6 nb) The Standard for Thermoplastic-Insulated Wires and Cables, UL 83; or
5 u" n1 M+ T8 Y3 w6 a8 ^c) The applicable UL standard for other insulated conductor types specified in Wiring Methods
and Materials, of the National Electrical Code, NFPA 70.

# k2 I! x* }4 K! A( o7 c" x

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
not comply with UL 758.
* q# S3 T6 L- J6 h* |5 q/ B, \9 v

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

# f; N1 x; |# T% qa) Wire insulation consists of silicone or inorganic materials with glass or aramid braid fiberous
/ o1 ^  t" n& x1 dcovering. [For reference, examples UL Style 3251, 3257, 5420]

b) Conductors shall be stranded copper wire having a 600 Vac minimum insulation rating for
- e: S" `# w2 O( l1 chigh voltage circuits and having a 300 Vac insulation rating for low voltage circuits. Maximum
# {/ p. W; G: t# ~current rating would be based on Table 10.1.

3 v" D( Q- P5 W$ a7 M2 V4 x, Oc) The product is compliant to 77A for all electrical connections that involve internal wire not
0 T- C8 l3 V) l- n5 |" krated VW-1.

其中,

, J% N. q( K, ~2 ~8 G

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
6 a. U$ w3 E6 c6 j& I7 j5 L

* H1 h# V4 |9 H" l