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
# \. K% ]  R) c+ tWiring 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
/ T/ Q* r/ N% e! f: V; Zfollowing:
9 }+ r) K1 x* M+ D  n9 ea) The Standard for Thermoset-Insulated Wires and Cables, UL 44;
; Q8 y7 x  o, q& o* tb) 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
$ w9 I2 C# t: O  P6 y( }: I" q- aand Materials, of the National Electrical Code, NFPA 70.
0 h8 h/ ^8 S8 m  z5 ?! D, p

" {  v, T" W" q& u6 Q

Exception No. 2: Insulated conductors for specialty applications (e.g. data processing or communications)
. S' J6 p: w& o/ d+ Vand located in a low-voltage circuit not involving the risk of fire, electric shock, or injury to persons need
* r( r  u2 Q3 v/ B( `not comply with UL 758.
, T0 S) I9 x$ f3 @

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
! s  f. q' ^) B' \5 c) ]" {covering. [For reference, examples UL Style 3251, 3257, 5420]

b) Conductors shall be stranded copper wire having a 600 Vac minimum insulation rating for
high voltage circuits and having a 300 Vac insulation rating for low voltage circuits. Maximum
9 ?6 ~5 N% I+ a& T6 |$ v9 z+ k/ icurrent rating would be based on Table 10.1.

0 |3 G1 Z, ^* ?0 Rc) The product is compliant to 77A for all electrical connections that involve internal wire not
8 r2 ]" c+ O8 l5 r1 x; urated VW-1.

" ~% H* `( o2 w0 `  ?, f  @  L

其中,

; V: \: a* T$ ?# w2 c; D

问题1:

% r7 ?& p2 N6 l: |2 U% t

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