Three Phase Motor Power Cable Voltage Rating

[Locus]

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.

 

[Andy™]

is this a college question?

 

[kerching]

Seriously 'can you use a 3 core and earth cable' for wiring a motor?
IF it only needs 3 cores and earth then yes, if not , then yes again BUT this time it won't work

 

[Fleeting]

First you need to understand 300/500v. As above is this a college question.

 

[poni]

can you get a cable with colours like that?

4 cores (Br Bl Gy & Yellow)

 

[Locus]

Star-connected motor. Brown/Black/Grey & Yellow/Green - Casing.

Completely under what is 300/500V i.e. permissible nominal voltage of a cable, specified in volts. 300V is the maximum permissible effective value between the conductor and protective conductor whereby 500V is the maximum permissible effective value between the phase conductors. Usually, 600/1000V is used but I would like to know if it is a usual practice to use 300/500V and whether it is permissible. Thanks

 

[Locus]

can you get a cable with colours like that?

Yes, it is available 2.5 sq. mm 300/500V

 

[poni]

Yellow/Green

not just yellow then

 

[poni]

Completely under what is 300/500V

are the voltages RMS value?

 

[poni]

Yes, it is available 2.5 sq. mm 300/500V

where can I get some?

 

[Locus]

are the voltages RMS value?

RMS Values