Answer Posted / shy11am

S.D.F Stand for 'SWITCH Disconnector Fuse' Unit with
Tripple pole neutral(R,Y,B,N).

it provide more safety compare to general fuse unit.

What are the parts in a inverter?

2138

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why we use ac supply as 415 volts instead of 415 v why we cant apply 230 v for dc

2455

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Disadventage of cable-gland earthing if any ?

2307

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For refrigerators the motor current is raised beyond its rating on both conditions when the voltage of the system is more(say 270v) than the rated voltage(220v) as well as when the voltage of system is less(say 160v) than normal voltageof 220v, why explain?

2034

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What is the purpose of using busbar mounting fuse?

2088

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In ups static switch if i gives the supply at output end it will open the circuit in stactic switch or not if it will open then how it operates.

2359

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An ELHNC 80amp 240v 30mA RCD is tripping periodically, every 30 - 180 seconds is it safe to disconnect the protection circuit?

2208

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What is the formula for calculating impedance of transformers connected parallel at fault level 50KA?

2152

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I have c license but I don't know eligibility of Max Kilo Volts under the electrical licensing board.

1767

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All the socket in a room become very hot, the Wall was also became very hot and the earth conductor also became live, what in your view might be the possible causes?

1703

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I WANT BHEL PREVIOUS QUESTION

2425

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What is the effect of atmospheric pressure & Temp; on efficiency of motor? Why NGR(Neutral Grounding Resistor) is used in 132/11 KV Transformer & how? What is the use of Auto T/F in Grid Station?

1943

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What is purpose of reactor?.What is different between line and bus reactor?

1991

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How they LT panel busbar size choose

1734

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What is CVT and what is relation with wave trap?

2199

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