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发表于 2009-12-19 22:57:36
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2009 NFPA 79 Electrical Standard for Industrial Machinery dictates wiring colors for industrial machinery
- go nfpa.org for more info
Black = AC power at line voltage
Red = AC power at less than line voltage
White; neutral Gray = AC Neutral conductor at less than line voltage
Blue = Ungrouded DC power
Blue/white stripe or white/blue stripe = DC grounded voltage
Orange or Yellow = excepted voltage that may be energized while the main disconnect is in the off position
Green; Green w/yellow stripe = equipment grounding conductor
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UL
Industrial Control Panels - UL508A, you have to use the
following color coding.
In section 66.5.3, the UL508A standard lists the following
color coding for internal power wiring.
Black - all ungrounded control power circuit conductors
regardless of voltage
White or natural grey - grounded AC current-carrying power
circuit conductor, regardless of voltage
In section 66.9, the UL508A standard lists the following
color coding for internal control wiring.
Black - all ungrounded control circuit conductors operating at the supply voltage
Red - ungrounded AC control circuits operating at a voltage less than the supply voltage
Blue - ungrounded DC control circuits
Yellow - ungrounded control circuits or other wiring, such
as for cabinet lighting, that remain energized when the main disconnect is in the "off" position
White or natural grey - grounded AC current-carrying control circuit conductor, regardless of voltage
White with blue stripe - grounded DC current-carrying
control circuit conductor
White with yellow stripe - grounded AC control circuit
current-carrying conductor that remains energized when the
main disconnect is in the "off" position
The UL508A standard does not apply to wiring outside the
industrial control panel. |
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