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head0819 发表于 2015-12-25 13:08 , M' t5 p7 \1 G
我们还是参考一下UL62 Flexible Cords and Cables
+ x: u+ |5 W; R* w- i3 ?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:
: D8 G5 h+ t9 i& ^200.6 Means of Identifying Grounded Conductors.
9 k8 v$ c# q+ ]6 M7 y ?(A) Sizes 6 AWG or Smaller. An insulated grounded conductor4 a/ k/ q/ T! \1 J7 Z/ Z
of 6 AWG or smaller shall be identified by one of) p9 \! J' P) g" i
the following means:4 I! p, {: J' S0 ~9 [" b Q9 j/ `! V
(1) A continuous white outer finish.- i- x( ^3 H8 h: ~$ Y3 T
(2) A continuous gray outer finish.
& M6 B9 L$ A+ ^3 ~(3) Three continuous white or gray stripes along the conductor’s
0 N/ W2 z1 r/ R J' z/ _entire length on other than green insulation.) @0 Q: T4 {2 O" x0 x- x
(4) Wires that have their outer covering finished to show a- b$ g1 H9 X; _: G
white or gray color but have colored tracer threads in* H7 e( E+ S* ^! {; P" B
the braid identifying the source of manufacture shall be; `2 i, P3 Q- {
considered as meeting the provisions of this section.' L# W7 c$ U1 k/ q! r0 g
(5) The grounded conductor of a mineral-insulated, metalsheathed
$ ~: @9 _; Q$ Qcable (Type MI) shall be identified at the time of- n9 [/ c2 c7 r* Z
installation by distinctive marking at its terminations., E/ ~1 [, {# m" Z) x7 I9 q: V
(6) A single-conductor, sunlight-resistant, outdoor-rated9 u' G$ K; l, I8 O
cable used as a grounded conductor in photovoltaic0 @2 r8 T) A8 z0 B2 K" H* N8 X6 a+ w
power systems, as permitted by 690.31, shall be identified2 u2 m+ ?2 L, k" X! Z" l* K
at the time of installation by distinctive white
* T! b* X i- r/ h$ ymarking at all terminations.' M/ q4 j: E4 z0 z. s# v9 D/ ^
(7) Fixture wire shall comply with the requirements for# j( }; H5 k: a6 Z" A N
grounded conductor identification as specified in 402.8.! x3 g. F# M* |; u6 \ i5 y
(8) For aerial cable, the identification shall be as above, or
% `! ]2 E: I1 Z0 I- Aby means of a ridge located on the exterior of the cable. [! p/ p" H6 Y" T) u
so as to identify it.: }) c$ z4 a% _/ L/ C
+ N7 ^ y/ q0 P" ] J, x5 o( `6 w% D# x4 I
(B) Sizes 4 AWG or Larger. An insulated grounded conductor( e4 F1 @, e0 f& p x' C: }
4 AWG or larger shall be identified by one of the' L. F2 l! V! n3 `! x+ e
following means:( I' J- K% ]$ C: Z
(1) A continuous white outer finish.
& G$ Y' s% p" {+ _6 C# m(2) A continuous gray outer finish.4 @8 _% M3 ]' c' I
(3) Three continuous white or gray stripes along the conductor’s
6 h& H: ?6 z4 Q" i$ F) b; eentire length on other than green insulation.- f% ]* u& D$ @* E* R
(4) At the time of installation, by a distinctive white or
, q; I8 j* P" |: \/ d9 \/ z1 h) fgray marking at its terminations. This marking shall; h2 @5 K9 x: S1 Y A9 t
encircle the conductor or insulation./ O, `/ g* a/ _ x
(C) Flexible Cords. An insulated conductor that is intended1 {3 {) b+ v3 h3 W. }4 d
for use as a grounded conductor, where contained
2 r ?/ R- { l. X8 n3 `0 v: ewithin a flexible cord, shall be identified by a white or gray+ r* C' @; ]/ R [) g d
outer finish or by methods permitted by 400.22.; x$ p* i. _* z8 i( p& y4 f2 s; n7 H
(D) Grounded Conductors of Different Systems. Where7 Y0 a9 J* O# n+ e+ N6 t' l
grounded conductors of different systems are installed in
8 Q5 B) M7 B% r7 Ythe same raceway, cable, box, auxiliary gutter, or other type* ?6 X3 E/ A. l; W: l
of enclosure, each grounded conductor shall be identified
0 }8 s# b( Q v- ^by system. Identification that distinguishes each system
- L. m6 |/ M& s4 Q2 y- q6 o0 T! Fgrounded conductor shall be permitted by one of the following
\* j/ s- y( a/ k$ bmeans:8 d& L. I( I$ F5 _* H8 v
(1) One system grounded conductor shall have an outer0 P2 E7 Y6 x, P6 D' d( X4 |1 |4 Y% K4 s$ _
covering conforming to 200.6(A) or (B).
( d* O+ ?8 L. e# F& w(2) The grounded conductor(s) of other systems shall have6 q0 Q) ^+ X" l: l4 |9 W
a different outer covering conforming to 200.6(A) or: m4 Y* D/ I3 n3 }# ^7 g! f
200.6(B) or by an outer covering of white or gray with
9 F+ K0 m" s) y1 y7 p1 i! La readily distinguishable colored stripe other than green6 E; c! _' e) y \8 L; x6 O
running along the insulation.4 |5 i5 _& ], L; h5 i- @- l
(3) Other and different means of identification as allowed/ i( w% r7 c- J3 Z# j
by 200.6(A) or (B) that will distinguish each system% E. ^4 l: Y n L$ e$ v6 s4 h
grounded conductor.0 A0 A f, e' f+ h# ?, n z1 R& L
The means of identification shall be documented in a a2 k: d3 k2 o: Z$ [
manner that is readily available or shall be permanently$ Y# D" G* @3 y4 h% U2 w, c0 @( _
posted where the conductors of different systems originate.1 L) O9 _' c3 }
(E) Grounded Conductors of Multiconductor Cables. The# K4 S: S U0 n: e
insulated grounded conductors in a multiconductor cable shall) ?+ N% n' G' V
be identified by a continuous white or gray outer finish or by
9 F! {, V0 n7 E% D/ Pthree continuous white or gray stripes on other than green
: i, N8 }& w; g5 ~insulation along its entire length. Multiconductor flat cable% h( v/ U) X1 k) A7 a
4 AWG or larger shall be permitted to employ an external
, G! f5 h1 M( `* W* gridge on the grounded conductor.) N& p1 m8 A' q$ W. p5 I
Exception No. 1: Where the conditions of maintenance and* ^& u( G# m U+ t
supervision ensure that only qualified persons service the installation,5 O3 |1 L. O2 Y1 u: k' V8 {6 O
grounded conductors in multiconductor cables shall
5 x" p1 }; k8 u+ O0 j* X9 g' Sbe permitted to be permanently identified at their terminations$ K( ?7 V/ D; ^& I( D+ B
at the time of installation by a distinctive white marking or9 B' t% e9 D) Z; \$ C1 _. b2 |* o
other equally effective means.
8 S4 a. } ] ?Exception No. 2: The grounded conductor of a multiconductor
8 @* _% J% Z5 ~: @9 {0 M/ Vvarnished-cloth-insulated cable shall be permitted to be
. h; Y p4 c2 Q/ @& C% _' [/ G9 m5 D$ p- A0 Q5 ^; x$ f. n
identified at its terminations at the time of installation by a
/ b M% q& {3 Cdistinctive white marking or other equally effective means.. y( k2 n$ r( h
Informational Note: The color gray may have been used in
7 a" C4 h- K+ L/ R5 P6 Fthe past as an ungrounded conductor. Care should be taken
; q1 [7 ]+ a+ D( S9 f2 T& ?when working on existing systems.
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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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