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head0819 发表于 2015-12-25 13:08 ! @) D* }" q* D* a
我们还是参考一下UL62 Flexible Cords and Cables + B8 x! L/ S% C) V" X
其实所有这些所谓的白色/灰色是零线的要求要回到:NFPA 70 第200.6节要求:
9 S* D m1 w5 `- ?4 a3 |! v200.6 Means of Identifying Grounded Conductors.& w8 C& m0 M5 \' u7 ?5 [1 \/ d
(A) Sizes 6 AWG or Smaller. An insulated grounded conductor- {, V$ q4 t2 `" `. X+ t- u! r
of 6 AWG or smaller shall be identified by one of
6 T# n+ ~0 m+ O- R% R4 V w% w) X; pthe following means:+ Q+ w- E% e+ T/ ]/ Q, m: Y# ^
(1) A continuous white outer finish.
+ h" E; n {' {( }$ n, E7 T(2) A continuous gray outer finish.* c' X* [2 W" g$ M) N$ T
(3) Three continuous white or gray stripes along the conductor’s
4 R5 F& o" j7 C: e) Bentire length on other than green insulation.! N7 J- R# Z Z
(4) Wires that have their outer covering finished to show a# w" Y6 `& y* X9 T/ n0 d
white or gray color but have colored tracer threads in5 F+ L5 T# @6 G9 S: i
the braid identifying the source of manufacture shall be
" H" ]9 W0 Q. v M: C9 o& D8 qconsidered as meeting the provisions of this section.
& F4 z3 O e1 _7 S5 c- k(5) The grounded conductor of a mineral-insulated, metalsheathed
6 F6 C# U& m; \2 Bcable (Type MI) shall be identified at the time of* U) ~- H7 q C& F* [
installation by distinctive marking at its terminations.+ O# }) ~- z2 B0 }
(6) A single-conductor, sunlight-resistant, outdoor-rated
8 d# R- N8 F& ?- gcable used as a grounded conductor in photovoltaic
" `. K' e) ~. T" b- r- ^( Z- gpower systems, as permitted by 690.31, shall be identified
0 r- W* I5 G6 W8 O, a, h( d1 kat the time of installation by distinctive white
. e; v. [0 O: j% s" `1 ~marking at all terminations.
# {0 u5 x: g7 g. H, ?/ ~(7) Fixture wire shall comply with the requirements for
- }5 g2 @! B+ Z0 T9 vgrounded conductor identification as specified in 402.8.
; ]5 i: Y# B$ z0 [. n1 `* B(8) For aerial cable, the identification shall be as above, or
; n2 z8 V& s0 B$ I( N$ Mby means of a ridge located on the exterior of the cable
+ }1 ]2 d$ S3 P# h( M* H% q$ zso as to identify it.
. E8 i, e2 B" h5 C' }9 e" r# p; P2 _
(B) Sizes 4 AWG or Larger. An insulated grounded conductor
$ M, O* Z D& p. r" Y0 V9 _2 i! E4 AWG or larger shall be identified by one of the
, R/ q* Z! k$ E0 f! Q8 K% Afollowing means:1 X2 l: t/ R" i; |1 C
(1) A continuous white outer finish.
e7 p2 X7 I! G0 {$ g& u6 Q(2) A continuous gray outer finish.
: I7 Z; @" w& L(3) Three continuous white or gray stripes along the conductor’s, X) [2 x. _" S, m" N* `
entire length on other than green insulation.3 O& | i, a( B. e" C# j- @" I
(4) At the time of installation, by a distinctive white or* u6 W8 R' D- v/ p, I/ M0 W8 r) W
gray marking at its terminations. This marking shall
# i% S* z9 \, Z9 o8 xencircle the conductor or insulation.
8 \9 I0 o2 W4 r3 V/ n- Z(C) Flexible Cords. An insulated conductor that is intended
% p8 a0 h' J# D1 p8 s8 i0 N9 hfor use as a grounded conductor, where contained1 f- _* t5 K8 U) [5 x
within a flexible cord, shall be identified by a white or gray; x1 h* T$ @6 c
outer finish or by methods permitted by 400.22.1 |) i$ t4 L6 Z- _% q" {
(D) Grounded Conductors of Different Systems. Where& N* O" t4 Z3 M0 E' b' |
grounded conductors of different systems are installed in+ K6 ]1 @7 A2 z! S( I( e& s
the same raceway, cable, box, auxiliary gutter, or other type! L& Z0 q9 f9 M
of enclosure, each grounded conductor shall be identified
8 }; f4 I: c' G2 \ ~) F/ {% zby system. Identification that distinguishes each system
+ x: U' j* }7 A F# \* ]grounded conductor shall be permitted by one of the following
/ \. D# d' J0 Q" O Z+ kmeans:
0 H( E8 H6 G9 @3 }" }: ~- q(1) One system grounded conductor shall have an outer
' i6 M! g9 o9 L: f7 T( B0 } {& m Ucovering conforming to 200.6(A) or (B).1 P; r! c) x( B3 ]7 p
(2) The grounded conductor(s) of other systems shall have& I: b* w6 F- t8 H
a different outer covering conforming to 200.6(A) or- ?; q% ~. W3 Y0 P- a( R/ S
200.6(B) or by an outer covering of white or gray with
( E: V' A5 }6 B. Za readily distinguishable colored stripe other than green
# q0 ^! a5 g5 \! a6 Vrunning along the insulation.
, i- q: }7 G" X s(3) Other and different means of identification as allowed5 T: {8 }% D. g2 U! v
by 200.6(A) or (B) that will distinguish each system# e2 J1 u6 C+ }
grounded conductor.3 h! m7 [7 d6 ?; k" q5 g1 m
The means of identification shall be documented in a
& r$ j- U. _& U& D% x e9 kmanner that is readily available or shall be permanently
3 [2 E3 j3 _4 H# Q/ h: w* i% Nposted where the conductors of different systems originate.1 B0 V2 h# y& @# w4 i5 P6 j) W x+ U
(E) Grounded Conductors of Multiconductor Cables. The4 U, ^7 E, y& w% q% L; [
insulated grounded conductors in a multiconductor cable shall4 n: v3 G% g6 g5 N) P" e
be identified by a continuous white or gray outer finish or by
2 b I8 z( I- W+ g. g! p9 b xthree continuous white or gray stripes on other than green
# `; @! [- A: s% b. q! X4 g+ y* \insulation along its entire length. Multiconductor flat cable
9 C# X/ B- Q8 e4 AWG or larger shall be permitted to employ an external
" P; ^ a P; w8 ^& H8 Lridge on the grounded conductor.
* V* A3 c/ y. xException No. 1: Where the conditions of maintenance and
% M* P2 |5 d5 o" T( P8 Y1 \6 Qsupervision ensure that only qualified persons service the installation,. Z2 J" ?- ?- I& ^
grounded conductors in multiconductor cables shall9 x% v" q* S/ m9 T! \# `
be permitted to be permanently identified at their terminations1 z- [2 n$ c" [& v o0 U" k
at the time of installation by a distinctive white marking or* P) u5 F+ ~8 ^) C3 k2 w" Y
other equally effective means.4 @" j! v7 ^! z/ ~( j( d( G
Exception No. 2: The grounded conductor of a multiconductor0 W( a6 R# S3 \; k+ t7 \
varnished-cloth-insulated cable shall be permitted to be( `; R z1 b7 l; _$ M$ J' q
; O3 N: Y* s4 uidentified at its terminations at the time of installation by a$ D& t- z6 V3 s
distinctive white marking or other equally effective means.
! H$ e) [! _2 {: c( IInformational Note: The color gray may have been used in
. n! J/ u% _+ G+ D" Y; F. W3 hthe past as an ungrounded conductor. Care should be taken
* E. r$ |5 f, O$ Q6 K+ Y4 j. d6 Pwhen working on existing systems.
5 n' _* _2 V0 ]5 I( }2 |; [1 ]+ F% I8 x
& M0 ?5 M& d2 x4 k( X' J4 Q有兴趣的可以看看。Grounded就是说的Neutral。你所列的UL62要求就是200.6 (C)要求。 |
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