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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. & S+ Q# ?7 j' q5 g, m! s2 S- k
10.8 Internal wiring composed of insulated conductors shall comply with the Standard for Appliance
; w5 L8 ^7 d4 _3 j0 wWiring Material, UL 758 and shall have a flame rating of VW1.. E' ~6 {# i( q4 C# f
8 ?* }( h) M5 M% N0 D8 s) C
Exception No. 1: Insulated conductors need not comply with UL 758， if they comply with one of the
' q( l' x. o) x% u7 j! M) Wfollowing:! K% X. p8 j1 J" R' t" O% X
a) The Standard for Thermoset-Insulated Wires and Cables, UL 44;
3 \. C; Y+ H2 b& ub) The Standard for Thermoplastic-Insulated Wires and Cables, UL 83; or4 `3 u; z/ B: o' i0 `, P" p
c) The applicable UL standard for other insulated conductor types specified in Wiring Methods
6 f& k- m5 X. O% k3 d" o$ m$ tand Materials, of the National Electrical Code, NFPA 70.2 _7 ]+ T Q9 c- v: W, b$ s8 Z4 g
6 N" T: [, Z( A9 v9 Y( _" Z/ |3 W) H2 z
Exception No. 2: Insulated conductors for specialty applications (e.g. data processing or communications)
+ v9 ^/ D) Y7 i0 a( L% p+ L& fand located in a low-voltage circuit not involving the risk of fire, electric shock, or injury to persons need5 `* t4 C5 r+ _
not comply with UL 758.* n/ E0 {% F7 A- A8 N" v
# d8 s4 `' I% x4 {
Exception No. 3: Wiring in the appliance does not need to be VW-1 if all of the following criteria are met:
F, a0 V1 O8 f4 S/ N/ C, Sa) Wire insulation consists of silicone or inorganic materials with glass or aramid braid fiberous5 x: B; p' U6 ^8 `8 O
covering. [For reference, examples UL Style 3251, 3257, 5420]
: z3 v8 f- [2 A4 G1 E) X* {2 ~
b) Conductors shall be stranded copper wire having a 600 Vac minimum insulation rating for ^9 ?) a0 Q$ R M
high voltage circuits and having a 300 Vac insulation rating for low voltage circuits. Maximum
* x" r- F" ?; M! Gcurrent rating would be based on Table 10.1.
5 \# `2 r) Z7 |/ _! {
! a+ b: k/ _3 [+ uc) The product is compliant to 77A for all electrical connections that involve internal wire not
, M9 U& N4 o* s0 Irated VW-1.
7 [, I6 g, r; r/ J! t2 O1 n* n
* P" r! [8 R: L2 G+ A其中, # m7 e& b% o- Y8 F7 v
问题1: # @. J8 u% i: X3 `: N
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+ x4 d$ _( C' W
+ }3 g$ G2 v4 O
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发表于 2017-11-21 15:44
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