how digital four pin earth resistance tester works

2 Answers  

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What is an isolation transformer?Why do we need isolate circuits?Where do we use them?

2 Answers  

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How does a clampmeter measures dc current

1 Answers  

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when we are going to higher voltage level in substations why we are using Sf6 circuit breakers instead of Vacuum circuit breakers.

3 Answers  

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Can anyone explain me the operating principle of the megger tester?( I just know that its diflection relates with the ratio of currents of control & diflecting coil. I need more information as breif as possible)

1 Answers   TCS,

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What is min and max voltage between earth and neutral/phase if it perfect earthing?

37 Answers   Epoch, ISS, ITC Infotech, L&T, Power Works, Statex, Sterlite, Wipro,

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How can determine cable size with respect to cable length and area in mm2

1 Answers  

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two transformers of the same type, using the same grade of iron and conducting material, are designed to work at same flux and current densities, but the linear dimension of one are two times of the other in all respects. The ration of kVA of the two transformer closely equal to................? options: 16, 8, 4, 2

2 Answers   Vizag Steel,

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we have 3 phase 4 wire supply 230/415 V.AC and our distribution is single phase or we have all single phase 220 v,ac operated appliances. and noted the current with help of clamp meter Red to N = 20 Amps. Yellow to N = 45Amps and Blue to N = 30 Amps ( total is 95 Amps ) what will be neutral current on the main .

1 Answers   ABC,

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pls tell me about ups internal connection & we have given only 3 phase supply to ups system how get 4 wire (R Y B N )

0 Answers   Bhel, IBM,

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what is the reason of current flow in nutral although load is balanced (three phase equal current)

3 Answers  

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why celing fan is running in anti clock wise and table fan is running in clock wised?

5 Answers  

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