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因为laid off 后到NY的朋友(儿子的房东的华人公司)搞点现金所以记了一点美标。回加没有洗脑. R1 {2 T6 a2 T( [" _
忙中出错,对不起大家了,现改正如下。 0 h& j$ P) R. U * p3 ^% D( ^3 A4 QUS, AC:The US National Electrical Code only mandates white (or grey) for the neutral power conductor and bare copper, green, or green with yellow stripe for the protective ground. In principle any other colors except these may be used for the power conductors. The colors adopted as local practice are shown in Table below. Black, red, and blue are used for 208 VAC three-phase; brown, orange and yellow are used for 480 VAC. Conductors larger than #6 AWG are only available in black and are color taped at the ends. e; q1 P* K2 F% r3 m$ Q 2 `/ d7 a O' _, m: ~9 U8 xCanada: Canadian wiring is governed by the CEC (Canadian Electric Code). See Table below. The protective ground is green or green with yellow stripe. The neutral is white, the hot (live or active) single phase wires are black , and red in the case of a second active. Three-phase lines are red, black, and blue.
this is what code says:3 s2 _/ N5 ?/ z
4-028: Identification of insulated neutral conductors up to and including No. 2 AWG/ Q" d) i2 F* r: j& Z* n0 ]
copper or aluminum& n* q7 u2 n0 X
(1) Except as permitted in Subrules (2), (3), and (4), all insulated neutral conductors up to and including ; Z8 m. G7 l% D: t- c) aNo. 2 AWG copper or aluminum, and the conductors of flexible cords that are permanently connected to + n7 B( b0 \& W" U" r( F D- Wsuch neutral conductors, shall be identified by a white or grey covering or by three continuous white stripes' j5 R7 V4 s+ P
along the entire length of the conductor. . l1 b9 u% R! A. V(2) Where conductors of different systems are installed in the same raceway, box, or other type of enclosure b6 |9 f! |+ A8 i
and the identified circuit conductor of one system is coloured by a white or grey covering, each identified5 H* M3 L J/ l% Z
circuit conductor of the other system, if present, shall be provided with a specific identification, and the 7 p4 v! E% F- E: y- ^# o* G& J5 cidentification shall be permitted to be an outer covering of white with an identifiable coloured stripe (not' H; ~( g- O1 A
green) running along the insulation.' x* F4 y( w4 y6 \$ a
(3) The covering of the other conductor or conductors shall show a continuous colour contrasting that of " a& O0 {9 U3 K6 ^' Z+ b) pan identified conductor; however, in the case of those flexible cords where the identified conductor is* r0 E) b; j# d! w9 g
identified by a raised longitudinal ridge(s), the other conductors shall have no ridges. ( A* V4 F" o& @1 m7 U- F(4) For multi-conductor cable, the insulated neutral conductor shall be permitted to be permanently marked ( r6 k0 c" U7 h5 N2 G; Mas the identified conductor by painting or other suitable means at every point where the separate ( Z6 K8 Y1 u' j* f3 e6 Vconductors have been rendered accessible and visible by removal of the outer covering of the cable, and4 D5 y% T/ ~ y5 a& D
the painting or other suitable means of marking the identified conductor shall not be permitted to render ' y' b( s* u$ t3 Oillegible the manufacturer’s numbering of the conductor.