|
head0819 发表于 2015-12-25 13:08 4 A: T6 ?8 W- [5 A9 P5 o
我们还是参考一下UL62 Flexible Cords and Cables
3 R( n1 |: 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:, M0 L" j4 F0 g# e- D0 A
200.6 Means of Identifying Grounded Conductors.! J6 I4 [0 J+ m. l% @8 N
(A) Sizes 6 AWG or Smaller. An insulated grounded conductor- N8 C" o1 L- i6 u1 M; [
of 6 AWG or smaller shall be identified by one of
7 X" q1 n0 u! Ethe following means:
( N+ e4 H* |. e c(1) A continuous white outer finish.
4 X! W1 Z3 w8 q# |" n(2) A continuous gray outer finish.
% R" G# ?5 l& M* B- f(3) Three continuous white or gray stripes along the conductor’s. Q# K5 |+ C# k: R; i! o
entire length on other than green insulation.
9 |/ l5 D- N/ N7 z4 O6 `(4) Wires that have their outer covering finished to show a0 k# l: r& t3 X" m2 f. e
white or gray color but have colored tracer threads in) A, P5 e" D; H) B: L
the braid identifying the source of manufacture shall be1 \0 G3 o3 z' k, K# e
considered as meeting the provisions of this section.7 f8 q+ b" W, R4 A* L
(5) The grounded conductor of a mineral-insulated, metalsheathed
/ r( c# y' F8 U+ r( v1 lcable (Type MI) shall be identified at the time of7 m/ I1 G3 r/ Q7 W d! w
installation by distinctive marking at its terminations.
. T# H# i8 c4 X4 [+ I(6) A single-conductor, sunlight-resistant, outdoor-rated0 X5 n; E3 n! }. M) r# Y/ U0 `$ a
cable used as a grounded conductor in photovoltaic
1 _- ^9 p9 c& Z) p& Qpower systems, as permitted by 690.31, shall be identified0 f# b8 n, h0 s- ]: h
at the time of installation by distinctive white+ A1 W7 i1 T! B7 }- X
marking at all terminations.
" ?2 _" h7 F" |- w# \9 j: a(7) Fixture wire shall comply with the requirements for
2 D, Y" m& k( E5 X* w H& Fgrounded conductor identification as specified in 402.8.
' r P) S5 ?0 `(8) For aerial cable, the identification shall be as above, or$ E0 b$ c/ o% s g9 N4 N
by means of a ridge located on the exterior of the cable
4 S, W' S- l& ^8 O1 Yso as to identify it.
1 K- I" a2 Z% R( n1 d m8 m3 W E! n O% Z
(B) Sizes 4 AWG or Larger. An insulated grounded conductor
' V$ L8 h8 o) F4 W4 AWG or larger shall be identified by one of the
/ C8 O* W5 F; j l9 T8 q' {following means:
6 j6 X! O' [ p(1) A continuous white outer finish.! r8 v( `: D$ m+ h/ h
(2) A continuous gray outer finish.
- |9 Y# v. e4 ~% ]1 ~3 t* y(3) Three continuous white or gray stripes along the conductor’s3 m, Q( O: l5 L: d
entire length on other than green insulation." }; ?% x* b) h, Z% V
(4) At the time of installation, by a distinctive white or
* ^: y, O; z5 K9 Mgray marking at its terminations. This marking shall
# N8 O: i" E8 ]7 M- }) |( Yencircle the conductor or insulation. E2 k. Z7 O# Q' A3 w" r
(C) Flexible Cords. An insulated conductor that is intended
: N) L# s* N$ ^0 Rfor use as a grounded conductor, where contained
! Y! t% y Z; S) o, X& A6 ~+ uwithin a flexible cord, shall be identified by a white or gray. x7 }# O4 V+ G1 S0 r" l; t% z
outer finish or by methods permitted by 400.22.0 q# I7 F' Y* Q+ W2 E3 e
(D) Grounded Conductors of Different Systems. Where
% N8 w8 F8 V- C8 b; Cgrounded conductors of different systems are installed in* {# p& }1 z! A% S% D& n
the same raceway, cable, box, auxiliary gutter, or other type3 J7 j2 n2 l+ H
of enclosure, each grounded conductor shall be identified! ]3 H! F/ Y$ j
by system. Identification that distinguishes each system
8 |! z |1 n4 v, Y3 q4 X$ egrounded conductor shall be permitted by one of the following
; W* ]/ h/ k" A( T. q# L* omeans:
- j% X' }+ S; n1 T# g(1) One system grounded conductor shall have an outer
+ u7 F% ]2 M- Xcovering conforming to 200.6(A) or (B).
9 N" @: o8 H. z- g(2) The grounded conductor(s) of other systems shall have, J5 E3 f1 c* _7 e. c" s: d
a different outer covering conforming to 200.6(A) or c, d1 p1 @1 D+ e
200.6(B) or by an outer covering of white or gray with
% w8 O2 q7 n* _1 R+ u* ka readily distinguishable colored stripe other than green" ^4 Q( X9 r) g, J1 Z6 S9 x
running along the insulation.
7 i/ {$ ]9 \3 J7 B/ i$ l, a(3) Other and different means of identification as allowed
% ]$ {8 j# p; J5 zby 200.6(A) or (B) that will distinguish each system8 N9 p/ I0 v' K' m) s
grounded conductor.6 \, _" o, j& s2 V6 M, K
The means of identification shall be documented in a
- x# X8 n3 i# P& tmanner that is readily available or shall be permanently
' N! t+ i2 r, ~; ]' eposted where the conductors of different systems originate.2 O" {3 j5 x# V- b9 e, @# R6 _
(E) Grounded Conductors of Multiconductor Cables. The
+ d/ Y5 u; ~/ W9 h( }$ ^insulated grounded conductors in a multiconductor cable shall
4 k: R1 \6 ?+ }4 t8 `be identified by a continuous white or gray outer finish or by
- z; ]9 V7 @1 n N e+ X# n. Ythree continuous white or gray stripes on other than green% P3 T. @! [( j: m: V% ~6 U& S. O
insulation along its entire length. Multiconductor flat cable; {& h# e1 O1 G8 d
4 AWG or larger shall be permitted to employ an external' J7 p5 w7 C6 @# S @
ridge on the grounded conductor.0 e; M1 R f+ J& d
Exception No. 1: Where the conditions of maintenance and$ i! ^% h1 F e4 \" |
supervision ensure that only qualified persons service the installation,0 \# i- h- i# B
grounded conductors in multiconductor cables shall2 c( I+ f$ M9 ~( B/ l8 W( `( k
be permitted to be permanently identified at their terminations2 B6 p# b7 h) @" k8 b! X1 Q
at the time of installation by a distinctive white marking or
" i+ Y+ a4 Z7 S. c* h$ m, H) I8 b& f# _other equally effective means.
" f! z2 `+ L% ^$ J7 z% \Exception No. 2: The grounded conductor of a multiconductor
9 q: N3 W, J' kvarnished-cloth-insulated cable shall be permitted to be
$ W9 E) M; ~/ ?" W; y( J' w0 C8 p" a
) T! V3 {% k$ c) widentified at its terminations at the time of installation by a( v$ [- ~0 M% ]) M3 ^. X
distinctive white marking or other equally effective means.
$ `; o% f! A& t3 V- |/ \1 XInformational Note: The color gray may have been used in! j. {. [& C' o6 a# |
the past as an ungrounded conductor. Care should be taken
" ?9 E) S( ?& c+ p9 H' pwhen working on existing systems.- O* U @# @, ^% h S [& U+ l# }8 v
2 l# A$ N( y: L6 V3 |3 y& [
9 t3 n+ P6 N; O9 ~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。 |
|