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this is what code says:
( J g% y' y$ G+ p! Q* a2 }4-028: Identification of insulated neutral conductors up to and including No. 2 AWG
4 [( y& Q1 G0 n# K7 Icopper or aluminum
# S/ i4 S2 S9 ^. b9 L+ k" U(1) Except as permitted in Subrules (2), (3), and (4), all insulated neutral conductors up to and including
7 r; r3 z$ J* m* t [3 Y) R7 ONo. 2 AWG copper or aluminum, and the conductors of flexible cords that are permanently connected to
C3 F* i* T- c' I) i! v* Jsuch neutral conductors, shall be identified by a white or grey covering or by three continuous white stripes
+ E( E8 D5 w, valong the entire length of the conductor.
$ M/ \+ V$ o, }(2) Where conductors of different systems are installed in the same raceway, box, or other type of enclosure
/ }! n M( `' ~: o) m8 _$ Fand the identified circuit conductor of one system is coloured by a white or grey covering, each identified
. Y f( b: B7 y9 Acircuit conductor of the other system, if present, shall be provided with a specific identification, and the B6 J+ N* a# W3 F! U
identification shall be permitted to be an outer covering of white with an identifiable coloured stripe (not
y! K' e( @2 J! u6 m) ]' n1 Pgreen) running along the insulation.% k% @" w w0 n. H- ^9 g
(3) The covering of the other conductor or conductors shall show a continuous colour contrasting that of6 `% [# H7 Z8 g$ B5 ]* R$ y3 q
an identified conductor; however, in the case of those flexible cords where the identified conductor is7 j2 o- D/ p; Z) i1 T5 ^
identified by a raised longitudinal ridge(s), the other conductors shall have no ridges.4 T6 k- `% H% g g+ ~
(4) For multi-conductor cable, the insulated neutral conductor shall be permitted to be permanently marked3 Y% Y1 o% J9 [
as the identified conductor by painting or other suitable means at every point where the separate
& [) l- C- x4 N) Wconductors have been rendered accessible and visible by removal of the outer covering of the cable, and9 H8 t U. L4 _% f4 p0 M
the painting or other suitable means of marking the identified conductor shall not be permitted to render
# K7 e4 J9 |0 S6 k" K7 y; ?* hillegible the manufacturer’s numbering of the conductor. |
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