Answer / chellappan

perfect zero value is not possible and near zero is
achievable in highly damp or watery surfaces

Answer / janakiramankesavan

should be maintain below 2 ohmes.

Answer / rajneesh babbar

if earth resistane value (0 ohm)not achived even all best
effort (using copper plate,best salution & charcoal
Ext.),joined more parallel earthings.

Answer / chellappan s

It is thoritical and cannot be achieved. Acceptable value is 1 ohms for medium voltages by practice.
Still lower value may be archived by several methods where sentive equipments are to be earthed. It will be costlier.

Answer / shafi

It is desined by earthing calculation and practical
proved ,practical reading is taken in oil & gas area

Answer / shafi

Yes, earthing rod should be inserted below 2meter summer
water level by drilling method

Answer / sudhakar

generally earth pits with coal & earth pipes

Answer / anand prasad yadav

depending on soil & best salution quiring in side the earth
pit.

Answer / rafiq

yes its possible to get earth resistance zero ohm
by using copper earthing (copper plate )

How many energy meters can be connected on a 15VA Voltage transformer. please send a calculation sheet.

0 Answers  

Sir I want questions for rrb sec technician gr III (electrical)

1 Answers   RRB,

What is the different between Insulator & Di-electrict?

2 Answers  

How can you calculate in detail the VA burden of current transformer used for Restricted earth fault protection? Please understand that the CT required here is Class PX or X. Also please show the calculations for knee point vtg, stabilizing resistor, magnetising current.

3 Answers  

when we gave dc supply to 220v dc motor its rpm is 1200. then we gave 180v. how many rpm of its motor. gave answer with calculation at my ID.... ravizak@ymail.com

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any one please tell taht what type questions will be asked in BHEL interview, i am having interview on 24th Dec, please send this to mail pradeepsistam@yahoo.co.in

0 Answers   Bhel,

In any Industry, Which voltage level either 3.3kV or 6.6KV to be chosen? Then I would like to know ,Is there any cost consideration or Rating of motor?

5 Answers  

will aqatic animal die if we ground the wire of three phase instead of grounding to earth

2 Answers  

what is acceptable leakage current for 33kv cable while doing high voltage test for cable? how to calaulate the leakage current for 33kv or any rated cable?

0 Answers  

whatis the commertial spec. of distribution boards ?

0 Answers   Bosch,

How to discharge the battery as quickly as possible ?

1 Answers  

what is motor

6 Answers   HBL Power Systems,