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你可以参考UL62：
! C; D a. a3 H4.1.9.1 Conductors shall be distinguished as follows:
. y4 P. D' ?. A i(a) Grounded (neutral) conductors shall be distinguished by one of the following methods, and8 E6 W; m* W9 a8 @) u4 q! Y
these colours shall be restricted to such use:8 |" e ?, O% f- ?) a
(i) white or grey coloured braid;1 @, i; D3 s% g2 ^
(ii) white or grey coloured insulation; for jacketed cords furnished with appliances, one
1 f( P4 w& Z, Nconductor may be light blue with the other conductors readily distinguishable from white
+ E* F% J% R! [9 _& r/ w: ?- Ior grey;4 c+ k& D' P* r- | l) D+ X: G
(iii) white or grey coloured separator in integral constructions only;4 n) c9 F+ P9 U' C
(iv) tinned conductor on integral constructions only; or
$ f0 I8 u. \0 ]& `9 P; A(v) one or more grooves, ridges, or white stripes on the exterior of integral4 j9 r( _$ x" x0 B
constructions only.
) h+ R" g/ d d. Z$ D8 n(b) Grounding conductors shall be distinguished by the colour green or a combination of the) g4 J( r+ l' h
colours green and yellow. On a grounding conductor coloured green, one or more yellow stripes; o4 d6 \) L1 g* k% G! p
that cover no less than 5% and not more than 70% of the calculated circumference of the9 v# s2 w0 |+ B0 Q
finished conductor insulation shall be permitted. |
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