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this is what code says:
$ _* J3 c+ R$ a5 [$ h6 }7 ^5 {- N4-028: Identification of insulated neutral conductors up to and including No. 2 AWG2 B! s4 o, V3 t* T1 C! \
copper or aluminum
$ b. o! Y$ E: X8 F2 \6 r: L(1) Except as permitted in Subrules (2), (3), and (4), all insulated neutral conductors up to and including" o4 g# I; c8 Q Z2 G7 o2 p3 i
No. 2 AWG copper or aluminum, and the conductors of flexible cords that are permanently connected to0 o( S" e/ E8 y' I8 g) Z
such neutral conductors, shall be identified by a white or grey covering or by three continuous white stripes& O& _# }3 h( M0 P, a6 y
along the entire length of the conductor.) C* U" m$ J; l
(2) Where conductors of different systems are installed in the same raceway, box, or other type of enclosure, o; L) L! q5 @) ^
and the identified circuit conductor of one system is coloured by a white or grey covering, each identified
, T ~% Q/ N4 u! r, H9 [: Jcircuit conductor of the other system, if present, shall be provided with a specific identification, and the
& K+ Q% r0 X5 K9 W; e& x- ~identification shall be permitted to be an outer covering of white with an identifiable coloured stripe (not
3 b& E4 F5 Q: E" Egreen) running along the insulation.+ b0 j8 `+ N* O' \
(3) The covering of the other conductor or conductors shall show a continuous colour contrasting that of, I" y; B9 h8 u$ }% b
an identified conductor; however, in the case of those flexible cords where the identified conductor is$ I# n: ~3 G: U6 b
identified by a raised longitudinal ridge(s), the other conductors shall have no ridges.
/ r$ k$ E" t0 V8 K1 o(4) For multi-conductor cable, the insulated neutral conductor shall be permitted to be permanently marked: k, Q- @$ W& S! |5 {& a' ^
as the identified conductor by painting or other suitable means at every point where the separate
% \ Z; u1 u& a; R6 @8 Cconductors have been rendered accessible and visible by removal of the outer covering of the cable, and' j% J5 T5 e; U |' B
the painting or other suitable means of marking the identified conductor shall not be permitted to render
" `* V# J/ A) K4 A1 ?2 Eillegible the manufacturer’s numbering of the conductor. |
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