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this is what code says:
1 B7 l( v$ d; c4-028: Identification of insulated neutral conductors up to and including No. 2 AWG0 S1 J- G7 S$ J. I& d8 {
copper or aluminum
& m. G& U. s+ u6 X, k(1) Except as permitted in Subrules (2), (3), and (4), all insulated neutral conductors up to and including
3 R$ i% E- K2 h# D0 ZNo. 2 AWG copper or aluminum, and the conductors of flexible cords that are permanently connected to
5 B; z/ ~9 K7 }* ]; f# i9 k2 esuch neutral conductors, shall be identified by a white or grey covering or by three continuous white stripes
9 r6 b5 Q: S& Dalong the entire length of the conductor.
3 o8 K) n" g* i# L" p(2) Where conductors of different systems are installed in the same raceway, box, or other type of enclosure
% d. D# P0 W( P# n f% y% Jand the identified circuit conductor of one system is coloured by a white or grey covering, each identified
4 Z+ l& f4 k& H7 }9 `circuit conductor of the other system, if present, shall be provided with a specific identification, and the
b+ D% g$ k6 Sidentification shall be permitted to be an outer covering of white with an identifiable coloured stripe (not
6 Z; S4 V) w" Z5 H# Igreen) running along the insulation.
/ h* C0 E8 t" ^$ y5 h(3) The covering of the other conductor or conductors shall show a continuous colour contrasting that of
" ^" }7 i3 M# _" t! C! o/ }an identified conductor; however, in the case of those flexible cords where the identified conductor is: c/ Y- q; J0 H# P; f2 I, D3 ?) o; ~9 m
identified by a raised longitudinal ridge(s), the other conductors shall have no ridges.
0 t3 c+ u3 ]4 O5 k8 g/ f' M(4) For multi-conductor cable, the insulated neutral conductor shall be permitted to be permanently marked
3 v# L" ~7 L, }- x, e! F1 R; g7 r5 qas the identified conductor by painting or other suitable means at every point where the separate. q: o0 ?9 I$ S S
conductors have been rendered accessible and visible by removal of the outer covering of the cable, and* J$ d* }2 H2 k7 I E& M* U J& a
the painting or other suitable means of marking the identified conductor shall not be permitted to render
% f" y3 i( |: x9 @. |9 `illegible the manufacturer’s numbering of the conductor. |
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