Answer / sreenu

It is required to bring earh resistance to min. value
around 1-2 ohms for good earthing and the no.of earthings
to be done varies as per site conditions.

Answer / sanjay vishwakarma

TWO NO.S OF EARTHING ARE FOR BODY & OTHER TWO NO.S ARE FOR
NEUTRAL REQUIRED FOR ALTERNATOR.

Answer / dubai

I must add one point into this conversation as my friends
said-
Two earthings are for body & the same for body.

These earthings are connected in parallel & we lnow that in
parallel connection the effective /resultant resistance
decreases thereby giving a predominant earthing earthing
value.

Answer / vikas

Moreover, if one fails other will act as a stanby earthing
till the other is rectified.

Answer / ravikumar ts (knightfrank)

its realy requires four earthing because, two are
platesystem earthing for neutral & two are pipe earthig for
body.

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2 Answers  

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1 Answers  

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campared to ac, in dc corona loss is

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in a 740 kw dc seperately excited motor field voltage is constant about 17.4 volts and armature voltage is500 volts dc. how it is possible to have two different voltages from single transformer of output voltage 500 volts? if any difficulty in question contact ajitsingh.kadian@gmail.com

1 Answers