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Grounding is used in US Electrical installation Standards (NEC,UL)

Earthing is used in European Electrical installation Standards (IEC)

hai every bodi please let me know the test procedure for lightning arresters.

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In a company has been installed an analog amperemeter, this company was suplied by generator X, there is no problem in the ampere meter, rigth now this company's supplied by generator Y then the pointer in amperemeter vibrating. What happened? Why? Thank's

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as ac supply is given 2 the transformer why it doesnot depends upon powerfactor????

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what meant by Locked Rotor Current ?

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what percent do you derate your copper wire when you change from copper buss to copper wire

0 Answers   Gerdau,

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what is the exact direction of current? as we know current travels from higher potential to lower potential,so if we take battery +ve to -ve implies current direction is from positive terminal to negative terminal.,whereas electrons flow from negative to positive as they are attracted by positive ions.current will be the plow of charge but not flow of positive ions.please clarify my doubt friends.

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1. what is usage for power factor in industries?? 2.why we need to monitor power factor??

4 Answers   Havells,

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Double Busbar Scheme for outdoor switch yard system (132kv) step up power plant Hi friends 1. in this system both busbars energized all the time. 2. what is the meaning of main BB and transfer BB, 3. step up transformer connect main bus bar all the time or both BB connected through DS switch . 4.bus sectionalization means ? thank you.

1 Answers   ABC, Gael,

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how we could know that generator running anti clockwise with seeing the rotating direction of prime mover or engine

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how commomn gate triggering is given for TRIAC ? other thyristor wont be efffected?

0 Answers   BARC,

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how to calculate the power factor when instantaneous voltage and current has harmonics in it ?

0 Answers   Sandhar,

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How we can calculate the consumption in kwh of motor on basis of kw @100% load, @50% load & @ no load.

0 Answers   Grasim,

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