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this is what code says:
# {( J6 G5 }3 U) U4-028: Identification of insulated neutral conductors up to and including No. 2 AWG
! a; z9 I% J* M' L+ rcopper or aluminum7 n4 P* {/ X: K- R
(1) Except as permitted in Subrules (2), (3), and (4), all insulated neutral conductors up to and including; n5 D9 u+ l" c# `5 v* K
No. 2 AWG copper or aluminum, and the conductors of flexible cords that are permanently connected to0 F$ E" j+ e% D) }/ W1 e' @
such neutral conductors, shall be identified by a white or grey covering or by three continuous white stripes
0 t( C- L+ W- I2 V% `0 q1 Balong the entire length of the conductor.
$ C3 T5 P q( ?6 i# M$ x# @; o; b(2) Where conductors of different systems are installed in the same raceway, box, or other type of enclosure9 o8 p/ c- C' o5 W0 A6 ?& B* X
and the identified circuit conductor of one system is coloured by a white or grey covering, each identified
0 [7 w) ]" @ bcircuit conductor of the other system, if present, shall be provided with a specific identification, and the$ v6 v( s* l( L1 A% G
identification shall be permitted to be an outer covering of white with an identifiable coloured stripe (not
W2 @( \% M1 I& h1 wgreen) running along the insulation.
6 g! |. e4 I+ p7 W1 e2 p(3) The covering of the other conductor or conductors shall show a continuous colour contrasting that of9 t; r% J+ S1 D
an identified conductor; however, in the case of those flexible cords where the identified conductor is6 M1 k+ P% ` ?, U
identified by a raised longitudinal ridge(s), the other conductors shall have no ridges.
4 W7 G. T( ~) o(4) For multi-conductor cable, the insulated neutral conductor shall be permitted to be permanently marked
" `) F/ J: |5 C3 L7 D/ Las the identified conductor by painting or other suitable means at every point where the separate4 ]5 r M) W& S: J$ h
conductors have been rendered accessible and visible by removal of the outer covering of the cable, and
& H, x# c) p+ |1 m7 Y3 `the painting or other suitable means of marking the identified conductor shall not be permitted to render, Z/ y5 d% A, v2 ^; y- K, g" N Q
illegible the manufacturer’s numbering of the conductor. |
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