Answer / rvg

Fire pumps are emergency equipment, and even if there is
earth leakage, it should work uninterrupted.
So ELCB's are not used with fire pumps as per NFPA norms

Answer / prabakaran

Fire pump is used high rating pumps.its running sudden time at time elcp means automatically fall down because fire pipe connection is their in entire building so complesery connect any electrical distortion.so automatic ELCB tripped

Answer / a.alexander

1.reduce electrical short circuit.
2.reliability.
3.safty
4.fast working

Answer / pawan dahiya

ELCB full name earth leakage circuit breaker , normaly
ELCB used in main control line & very senstiv eqpment and
ELCB link in VCB\ACB etc. Earth leakage time going to
single in VCB\ACB so main breaker trip . But fire pumps do
not used becouse fire pumps is very emergency system.
becouse ELCB leakage time do not running the fire pumps.
fire pumps used only two earthing

If any HVDC line is going with positive & negative(the negative usually have return path of current with earthing electrode). Now the question is if this HVDC earthed electrode which is using as return path and earthed any nearby 400kv or 220kv AC substation equipments. which will be the impact of this on AC substation & its equipment, how severe may be this and what should be the minimum distance require between HVDC earthed electrode and AC substation equipments? It's really an high engineering level question...Dare to answer and increase your knowledge.

0 Answers   MEIL,

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What are the consequences in using existing step up transformer (primary 6.6kv/175A, secondary 480v/2405A) for step down transformer to have a 6.6kv output?

1 Answers  

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up to what extwnt of voltage the celing fan works?

3 Answers   ICSA,

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HOW GENERATING END VOLTAGE LEVEL (6.6 KV/ 10.5 KV/ 11 KV/ 13.5 KV) DECIDED IN POWER PLANT. ON WHAT FACTORS THE GENERATING END VOLTAGE DECIDED, & WHAT IS THE CALCULATION USED FOR THIS.

3 Answers   Areva, Cognizant,

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why the desirable efficiency for a motor is 60%, but in case of transformer, it is above 90%?

1 Answers  

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What type of DC motor would you see for a lift?

0 Answers   Ericsson,

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What is the difference between an ELCB and a RCD?

2 Answers   Schneider,

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if dc excitation is used to produce manetic flux in rotating machines then ehy it is not used in transformers.

4 Answers  

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what is the working of air compressor.

5 Answers  

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What type of a DC motor would you use for a lift?

0 Answers   GE,

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A 12.5 hp slip ring motor taking high initial current and its MPCB is getting open.what may be the reason?

3 Answers  

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Can any body tell me the different types of LT cables & their application.

0 Answers  

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