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head0819 发表于 2015-12-25 13:08
5 M' ?8 }* x# U% W2 w我们还是参考一下UL62 Flexible Cords and Cables
0 K. G" v1 P$ Z! A! J! r& U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:3 C( n8 V* y9 I: D2 e! i
200.6 Means of Identifying Grounded Conductors.% k& W5 M" W3 L& q+ y
(A) Sizes 6 AWG or Smaller. An insulated grounded conductor/ [8 i# T. D, ? a5 d9 g. a
of 6 AWG or smaller shall be identified by one of' s) }% U( T2 E4 b" s
the following means:
" ~+ i; e$ Z: i(1) A continuous white outer finish.
; m4 E" [) _% V$ Q5 @, B(2) A continuous gray outer finish.
5 o6 e) {! O5 k5 Y9 Z(3) Three continuous white or gray stripes along the conductor’s
3 ^% q' H4 Z5 e2 Q# E( j% bentire length on other than green insulation.
2 w# o+ Y7 V( y) ]! Y(4) Wires that have their outer covering finished to show a; T/ y1 X1 h4 A) i2 ^: i5 ~
white or gray color but have colored tracer threads in
* L( K# M) k* m1 l' m% Y lthe braid identifying the source of manufacture shall be8 |( Y8 H7 s8 V: T2 g) R! G
considered as meeting the provisions of this section.* \) G6 M* n4 l
(5) The grounded conductor of a mineral-insulated, metalsheathed9 z6 t8 c% c/ J
cable (Type MI) shall be identified at the time of
1 |. O2 r/ N/ {4 X3 K. `" A4 oinstallation by distinctive marking at its terminations.
( c# U/ n& r9 f2 E5 K) q8 i(6) A single-conductor, sunlight-resistant, outdoor-rated
+ m& c0 w* P s8 mcable used as a grounded conductor in photovoltaic
T! a, S5 ?* {! E$ W) `& ypower systems, as permitted by 690.31, shall be identified
: e% a- O9 H; `+ g8 e& F1 a g8 Y3 ^at the time of installation by distinctive white* G- {$ ~0 a7 j$ }
marking at all terminations.
; e+ E7 N/ N: S7 s2 T4 x, u* M(7) Fixture wire shall comply with the requirements for! Z g7 ^4 _% @
grounded conductor identification as specified in 402.8.0 A4 E; l( I$ H% z: X
(8) For aerial cable, the identification shall be as above, or
; D; u' f7 k' z8 \by means of a ridge located on the exterior of the cable6 X% H. K# F" I1 @% E" l
so as to identify it.
& _! I4 ~( j: a$ M" F3 \$ b2 B8 U: _0 ?7 x
(B) Sizes 4 AWG or Larger. An insulated grounded conductor! Y/ K# n4 }( d( a
4 AWG or larger shall be identified by one of the& H+ @, C; z& j* k0 R) a
following means:
: E; g+ Q. S" z; g' F6 z9 `! {(1) A continuous white outer finish.
& X4 K" G- ]8 N(2) A continuous gray outer finish.
. s* h! i; n0 f3 u. }. ^! T& ](3) Three continuous white or gray stripes along the conductor’s
& P7 n2 M$ D) a* S* B8 qentire length on other than green insulation. H5 K" y% c- u( u# Z( a+ Y
(4) At the time of installation, by a distinctive white or
?; {7 C# _7 {) d. [% q) Wgray marking at its terminations. This marking shall1 S7 I1 H% p6 H3 l# R) b4 i
encircle the conductor or insulation.
8 Q: @4 M( \9 L/ F6 |; B. T5 }; g(C) Flexible Cords. An insulated conductor that is intended$ [) ~) B$ e$ G5 f- Z) T" b L. h
for use as a grounded conductor, where contained+ l) M: H: T$ Q2 ?$ r
within a flexible cord, shall be identified by a white or gray
# B; q& x6 F3 c* ]( S+ D! W% w$ Pouter finish or by methods permitted by 400.22.
$ v( Z8 Y H3 Y p$ m8 W(D) Grounded Conductors of Different Systems. Where$ u0 a' ^0 a/ A1 p
grounded conductors of different systems are installed in
+ l7 B/ v! z: Ithe same raceway, cable, box, auxiliary gutter, or other type) s9 @4 b' I/ R: g
of enclosure, each grounded conductor shall be identified
! P9 t7 c0 }0 C. d( A0 _by system. Identification that distinguishes each system. G& \ v! B7 O7 _
grounded conductor shall be permitted by one of the following
: O9 C% V/ u$ g1 e) Hmeans:2 u% e7 n6 U; W( d" S
(1) One system grounded conductor shall have an outer% E& [* P4 f6 F& B( }
covering conforming to 200.6(A) or (B).+ ^( B3 Y/ X$ @$ s: o* ]+ a0 z
(2) The grounded conductor(s) of other systems shall have$ c7 Q4 \( ]) R
a different outer covering conforming to 200.6(A) or
( M$ x/ v2 @- s! X. j1 V. Z: e200.6(B) or by an outer covering of white or gray with
- n' p( u% v+ W/ X) Pa readily distinguishable colored stripe other than green0 e6 x" ~% X% X4 i" I+ @/ o
running along the insulation.
6 v8 z; h4 t4 Q/ o% D(3) Other and different means of identification as allowed
) } R4 M( a5 U% L. F* M) Y0 t. `by 200.6(A) or (B) that will distinguish each system
8 G" T* u" E' j. p- ugrounded conductor.# h. a9 U4 H- x- S7 B
The means of identification shall be documented in a
. r7 @' ?4 J" Zmanner that is readily available or shall be permanently: M* G4 C" i, u$ x+ W/ {
posted where the conductors of different systems originate.$ s, ~1 o1 ?( |' m& {# B0 ^" n) x
(E) Grounded Conductors of Multiconductor Cables. The
9 L8 N+ u) f8 Z, a- L) Winsulated grounded conductors in a multiconductor cable shall; V4 R0 \3 M% g. Y2 u+ W
be identified by a continuous white or gray outer finish or by
; O+ x* B8 x. d6 ?2 G. }& H, m" Wthree continuous white or gray stripes on other than green9 I1 C/ B r6 {
insulation along its entire length. Multiconductor flat cable
0 a$ R3 p3 b3 r* T% {4 AWG or larger shall be permitted to employ an external
; z ^9 z5 W6 q d/ Wridge on the grounded conductor.; H2 M( W/ C/ G2 s8 g. |
Exception No. 1: Where the conditions of maintenance and/ Y. A5 v( a8 A" p( I/ v3 G
supervision ensure that only qualified persons service the installation,
3 Q" G% g J; _: J. t3 Bgrounded conductors in multiconductor cables shall
$ n/ a+ o8 Q( ~2 }1 U" Zbe permitted to be permanently identified at their terminations
$ x( A# [' m6 p6 lat the time of installation by a distinctive white marking or/ y' O& Q% f: X
other equally effective means.9 P6 j# P% X5 [2 d+ k' m* G
Exception No. 2: The grounded conductor of a multiconductor) y& V- Z, Y4 A& ]; t( Y
varnished-cloth-insulated cable shall be permitted to be
) a/ L; U) _ {
' h, o# U4 i" f" ]identified at its terminations at the time of installation by a
. L4 f W/ Q6 adistinctive white marking or other equally effective means.
* e- S/ v: C4 X& l; sInformational Note: The color gray may have been used in4 {# T8 j2 Q+ r! @- S4 a
the past as an ungrounded conductor. Care should be taken
) R5 `0 g7 x0 J0 f" bwhen working on existing systems.8 k2 i4 N' l; S/ d. D
5 Y" d+ o: y: P6 \/ r# A7 C8 N
( [! c4 G0 t3 U _
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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