How to calculate cable size in sq units based on motor rating is KW

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in industrial lighting in each circuit how many lamps can be given? and how much load can be put on each circuit? is there standard for this? please help me with the standard description?

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Where voltage are high and current to be interrupted is low the breaker preferred is:

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what is cut out fuse?

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Why is a plain induction motor unsuitable for wide speed control?

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can we synchronize star system generators with delta system generators?

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Sir we have 12.5 MVA(110/11KV) transformer (Y-Y) connected,which tripped showing earth fault,when we charged transformer it stood OK ,but on connecting 11 KV feeders it tripped showing earth fault.our service engineers found that the B phase and R phase phase connecting to neutral broken from HV OLTC(on load tap changer),and R phase and Neutral is ok.Dissolved gas analysis shows that accetline content is high,tan delta value is 12.My dout is it is an internal fault of transformer,why REF or diffrential relay is not acted?

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What is the distance between the EHV lines and also the distance for earth ??

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CAN ANYBODY PL TELL ME WAT FACTORS CAN CAUSE UNDERVOLTAGE ON A BUS??? PL LIST ALL THE REASONS WITH SOME EXPLAINATION

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what is ACB and its function?

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how to calculation increase capacitor,increase power factor for three phase.

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if i have to use 14 kw what size of power cable can i use and size of earth cable also.

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