Power Supply - 3 Phase 400V
As per BS 7671, is it acceptable to use 4 cores (Br Bl Gy & Yellow) 300/500V cable be used for 3-phase motors?
What is the recommended voltage rating of power cables for three-phase motors?
Thanking you in advance.
Power Supply - 3 Phase 400V
As per BS 7671, is it acceptable to use 4 cores (Br Bl Gy & Yellow) 300/500V cable be used for 3-phase motors?
What is the recommended voltage rating of power cables for three-phase motors?
Thanking you in advance.
Cable voltage ratings (a/b volts) are a) to Earth and b) between cores, and as 400V 3-phase is 400V between lines and 230V between any line an N or Earth, then 300/500V cable should be adequate.
- Andy.
Cable voltage ratings (a/b volts) are a) to Earth and b) between cores, and as 400V 3-phase is 400V between lines and 230V between any line an N or Earth, then 300/500V cable should be adequate.
- Andy.
Being picky & pedantic.....
Are these (cable) ratings intended to be rms or peak?
One could argue that 230V rms (to earth) is really 230 * sqrt(2) = 325V since the cable insulation will be exposed to the peak of the sinewave.
Equally, 400V rms line-line is 565V peak.
Sooo... shouldn't we be talking about a 400/600V cable?
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