In industrial electrical enclosures, what does a red wire signify?
January 17, 2010 - 10:26 pm
Current, voltage, associated wth?
If it is from anywhere outside America then the Red is for Active (power) Pretty much every other country the three phase’s are red, white and blue, (unless it is flex-lead) and earth is always Green and yellow. In a single phase application red is hard active, white is switched, and black is neutral. However sometimes in industrial applications purple and pink are used, sometimes for the extra low voltage AC or DC Controls, This is pretty common for alot of pannels from asia.
If it is a motor terminal box (espechally a 3 phase) the colours are differnet again for the start and finish of the field windings.
Hope that was relevent and made sence.
January 18th, 2010 at 3:40 am
The NEC doesn’t specify color coding (except green) but there are some general practices involved. UL states that red will designate a switched power supply in control panels. I think the NFPA does also for machine wiring. MIL SPEC also says it will be a power supply in 3 phase wiring. You need to check what authority you will be using
References :
http://en.wikipedia.org/wiki/Three-phase_electric_power
January 18th, 2010 at 3:49 am
If it is from anywhere outside America then the Red is for Active (power) Pretty much every other country the three phase’s are red, white and blue, (unless it is flex-lead) and earth is always Green and yellow. In a single phase application red is hard active, white is switched, and black is neutral. However sometimes in industrial applications purple and pink are used, sometimes for the extra low voltage AC or DC Controls, This is pretty common for alot of pannels from asia.
If it is a motor terminal box (espechally a 3 phase) the colours are differnet again for the start and finish of the field windings.
Hope that was relevent and made sence.
References :
Qualified Electrican