uzoma


{ City } owerri
< Country > nigeria
* Profession * electrical
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Questions / { uzoma }
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Please, if 1kw is equal to 1.25kva; how then do I know how many kva in 7.5kw?

 Electrical Engineering 1022



Answers / { uzoma }

Question { MSEB, 152567 }

Do you know how to measure the earth resistance? if so
explain it


Answer

Earth resistance, is measured by Earth Resistance Device.
Which a good Earthing Resistance is suppose to give:
1) E to N = 0.7 V
2) P to N = 228.6 V
3) P to E = 228.7 V

And Bad Earthing is:
1) E to N = 0.5 V
2) P to E = 16.2 V
3) P to N = 228.6 V

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