Answer / lenovouser

Dear friends,
first it is common sense that in earthing you set more 100ma means when 100ma or more current is flow in nutral / earthing it may be trip. You aware that fatal current is 5 mA to 10 mA.
It is advisable to set 30 mA when in your home or industry you use 24 hours duty i.e continuous duty.
For higher capacity it i.e 100mA or more is apply where more current rated single apparatus is use. It is advisable to fit rccb with refrigerator, single phase water sump motor or pump and heater use in your house. In those house where small kids advisable to fit rccb.

Answer / md faisal

My house ..
Iam fixing 63A and 100ma 0,1A
This not triping y problem

1.What is the proper definition of power system stability? 2.some times a blue spark is visible in the secondary side of a distribution transformer at the contact position of bushings and fuse wire,why?

1 Answers  

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I have carried out wiring for lighting in a shed in Industrial area which contains Metal halide lamps & have balanced in 3ph.Now when we put all the lines on in the daytime the current taken at 3phases at MCB comes to be equal i.e.28,29,28Amps respectively but in the night time i.e between 7p.m.to 11p.m. at the same MCb the current is 52,59,62Amp, though I have fit 63A MCB it is tripping in the above period.What may be the reason.? Note: This industry is located in industrial area where majority of steel ingot manufacturing plants are there. Whether this may be due to harmonic? what should I do to overcome above problem.pl suggest urgently.

4 Answers  

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I am having a DG set.The 415 V from Generator is step up to 460 v and then the same is used for Induction furnace. before Step up, I am connecting LT load to my factory use. When Induction furnace is in service from DG, when i try to start a motor, the generator is tripped.Please tell me the reason.

3 Answers  

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What is the meaning of burden and class of accuracy of CT?

1 Answers   Home,

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Two CTs 1600/1 and 35/1 are in series. while checking the ratio test of a CT(1600/1),same 1600A will also pass through the CT having ratio 35/1. Will it be harmfull to the ct(35/1),if yes , what will happen.CT secondary is shorted

3 Answers  

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which circuit takes max. load & which circuit takes min. load i.e. SERIES CIRCUIT OR PARALLEL CIRCUIT??

3 Answers  

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where connected OLTC for transformers?

3 Answers   Apollo, CBRE,

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what are the different sizes of U.G. cable & where these cabl;es are used according to voltage ..

0 Answers   HPCL,

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when ELCB breaks the circuit than INVERTER auto-connect the circuit to the battery than how can the operetor is safe??

1 Answers  

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How to calculate the no of Ceiling fan (1200mm sweep) per unit area?

0 Answers  

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what is saturation? what role it plays in operation of ct's,motors etc and how its affects the behaviour of the same.

1 Answers  

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what is humming AC solenoid

2 Answers   Seagate,

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