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head0819 发表于 2015-12-25 13:08 ( |" e" u3 K0 l9 c w2 s
我们还是参考一下UL62 Flexible Cords and Cables : S2 V0 T! \ X n
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:1 F( T$ n+ X/ K2 S" g7 _+ P; I
200.6 Means of Identifying Grounded Conductors.7 q7 B, Q$ R" B7 {8 B
(A) Sizes 6 AWG or Smaller. An insulated grounded conductor7 X. Q; R9 B' z+ b
of 6 AWG or smaller shall be identified by one of
7 g7 X+ H# |9 x# T2 rthe following means:7 K$ U& I7 t4 D4 O' n6 V" l
(1) A continuous white outer finish.* @# B% L0 l* S$ V
(2) A continuous gray outer finish.2 ^9 j, Q0 i8 V9 D3 S
(3) Three continuous white or gray stripes along the conductor’s
0 d4 k. ~ `& e/ _5 X. qentire length on other than green insulation.% T) _+ c; c5 g7 [- [
(4) Wires that have their outer covering finished to show a
! S$ F0 M# T. ~' f6 Fwhite or gray color but have colored tracer threads in5 B5 G# c0 P$ r6 X( J$ e- D H+ J$ I
the braid identifying the source of manufacture shall be
, m9 b) `6 l" }) W' m3 t* n# Iconsidered as meeting the provisions of this section.* S' ^& v9 j) u: T* q3 I9 z7 r
(5) The grounded conductor of a mineral-insulated, metalsheathed) ]8 g# ~, d) `
cable (Type MI) shall be identified at the time of
5 L6 Y- u) _1 X7 A& \3 Dinstallation by distinctive marking at its terminations.! _7 d' w* \ z' h# H4 g
(6) A single-conductor, sunlight-resistant, outdoor-rated9 }, b$ ]( _9 r5 |2 e
cable used as a grounded conductor in photovoltaic
& T: c- Q- Y3 |" j/ P, `power systems, as permitted by 690.31, shall be identified8 e# j! @! Y2 k4 Z
at the time of installation by distinctive white
' \3 N7 B p$ C ?marking at all terminations.; R: Q9 ]( B2 ]1 T( R6 ^9 f# n
(7) Fixture wire shall comply with the requirements for8 q2 | d, A* r7 e
grounded conductor identification as specified in 402.8.
7 a, R' e8 M1 v6 b+ F. D(8) For aerial cable, the identification shall be as above, or
7 |/ [8 q4 R' Z7 _1 Hby means of a ridge located on the exterior of the cable0 T5 G5 k3 e8 ^" T6 z" b
so as to identify it.
& V3 M8 |# ?) F& _5 M; g/ s9 L
* ^1 ~9 p) _. `" s F! O# l" e' v2 a(B) Sizes 4 AWG or Larger. An insulated grounded conductor! T% v0 \# g9 Z6 o
4 AWG or larger shall be identified by one of the
% e# N- _- B. zfollowing means:
. ~& @! V, d, E6 B, g(1) A continuous white outer finish.
, u+ c2 h2 m' S+ C(2) A continuous gray outer finish." [& W$ t0 P" g$ s. g$ v
(3) Three continuous white or gray stripes along the conductor’s
0 Y4 X% @ e6 ] A& l( t1 I" bentire length on other than green insulation.
* O, g, u) \! D! @(4) At the time of installation, by a distinctive white or* n. Y. \7 B2 Y) Z- B: e5 o
gray marking at its terminations. This marking shall! L5 {0 c/ {$ N+ u
encircle the conductor or insulation.
) W- t* g5 N0 Z(C) Flexible Cords. An insulated conductor that is intended3 r+ \0 x ]8 p9 z4 m
for use as a grounded conductor, where contained6 c/ K: j3 a$ A
within a flexible cord, shall be identified by a white or gray
L& q3 a% p: A% d9 K, [2 c% J' wouter finish or by methods permitted by 400.22.
5 L, q0 `9 ]6 G) c(D) Grounded Conductors of Different Systems. Where
5 {! W# {+ \7 pgrounded conductors of different systems are installed in
" A, ~; L4 J5 I }+ Gthe same raceway, cable, box, auxiliary gutter, or other type8 Q# i0 S* u# S
of enclosure, each grounded conductor shall be identified
+ \' J. V u+ ~by system. Identification that distinguishes each system
# _3 R/ a) I" Z6 h9 y) g2 igrounded conductor shall be permitted by one of the following
3 S' U9 i7 [' wmeans:! g5 n7 k' d$ c# C
(1) One system grounded conductor shall have an outer
, n m$ s4 }# Mcovering conforming to 200.6(A) or (B).0 P* l2 P4 y: n3 A
(2) The grounded conductor(s) of other systems shall have
/ p8 q Y. l$ S, M7 xa different outer covering conforming to 200.6(A) or; T+ a( m4 S b) n
200.6(B) or by an outer covering of white or gray with% Z/ j8 Z+ e' y8 W2 }3 |; {& Z1 P( V
a readily distinguishable colored stripe other than green! [. M+ X5 x7 ^6 Q+ f' ?
running along the insulation.0 h$ t* | U4 t$ ?
(3) Other and different means of identification as allowed0 c3 |4 f( x, u, T
by 200.6(A) or (B) that will distinguish each system
( Z y0 {: e* z2 f2 n( I. |grounded conductor.2 L* g1 N6 L: f
The means of identification shall be documented in a
8 _* T. G8 ^8 Z: V; _- ymanner that is readily available or shall be permanently8 C4 h2 z! }9 o+ N( T4 J- ^% O
posted where the conductors of different systems originate.
9 S* g4 M% u( N" I* G/ Z(E) Grounded Conductors of Multiconductor Cables. The8 q( a# o" H2 Z3 ^
insulated grounded conductors in a multiconductor cable shall
, L/ j- Q; a: Xbe identified by a continuous white or gray outer finish or by
$ `. V- j2 g+ e4 lthree continuous white or gray stripes on other than green+ ^1 h, v9 a' E5 m& z* R" R
insulation along its entire length. Multiconductor flat cable
( F+ c% X" Z6 e! @4 a! x9 f3 Z4 AWG or larger shall be permitted to employ an external; b4 j7 M2 L% R
ridge on the grounded conductor.
- }* s; A+ m7 VException No. 1: Where the conditions of maintenance and
P5 t$ B; c9 k6 D$ @* j9 t' }5 Jsupervision ensure that only qualified persons service the installation,
) W3 x. y2 |" q9 L lgrounded conductors in multiconductor cables shall& ?: M( i7 K1 ^0 e4 i: l
be permitted to be permanently identified at their terminations
& ~+ \8 @8 |* l$ a/ R( \! [( wat the time of installation by a distinctive white marking or5 E* o9 M& U w$ V
other equally effective means.
2 u$ I" s1 @2 r$ @2 I0 T8 nException No. 2: The grounded conductor of a multiconductor
3 T" a* o6 ~; X+ e* Rvarnished-cloth-insulated cable shall be permitted to be1 V9 F4 l, ?* W
, ^. A+ _6 C3 r1 u; P' G; pidentified at its terminations at the time of installation by a) W( T5 P9 Q- t! G: h
distinctive white marking or other equally effective means.
) D. a$ M O- a+ p# @ S5 v" b w# jInformational Note: The color gray may have been used in
8 Z* C2 B) a4 M: f, nthe past as an ungrounded conductor. Care should be taken, {( o9 q' m- I" i7 o
when working on existing systems. Q( O8 z5 f; g5 X( V* w6 B
4 y. J2 Z9 c6 M, e! b' l& @
5 g& C" @+ Y( R( L- v# E
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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