Answer / thanigaivel

In that earth tester E1 and P1 short with wire and take a lead from that loop. and put 2 spike in that mother earth 1st spike connected to E2 and p2 connected to that another spike ... that looped wire is connected to earth bit . and put the earth test with ohms .. its show the value

Answer / mukesh_chavda80

with diagram please

why trasformer rated in kva why should have to maintain pf in our site 0.9

3 Answers   Dalkia,

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How to configure the drives in PLC, through Profibus commnication. And to how to address it?

0 Answers  

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7/20,3/20 electrical wire is specified as stated.Why?

1 Answers   TCS,

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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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how to calculate the surge level of surge suppressors related to the SF6 cicuit breakers?

0 Answers   Crompton Greaves,

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why v/f ratio to maintain constant in speed control of induction motor?

3 Answers  

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When we use air circuit breaker, it has O/L protection ,time delay SC protection, Instataneous SC protection & ground fault protection. They all have some setting range. But what is the suitable/allowable setting for the above protection which will be safe for the equipment? For example-O/L protection setting have a range of (0.4,0.45,0.5,0.55,0.6,0.65,0.7,0.8,0.9,1.0)xIn Time delay SC protection have a range of (1.25,1.5,2,3,4,6,8,10,12)xIn Time delay setting is 0.02,0.1,0.2,0.3,0.4 Instataneous setting is fixed to 20xIn Gound fault setting is given 100A,300A,600A,900A,1200A This setting are for 2500A ACB. So what will be the basic allowable setting for the above protection? is there any formulae to calculate this<

0 Answers   Lupin,

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How to size a transformer which will supply power to 550kW,690V motor starting with VFD?

1 Answers  

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I have been using an 600VA with 0.6 p.f UPS with my desktop which has 450W power supply unit. Can anyone explain how can this happen . Because the output of the UPS is 360W (600*0.6) (<450W)

0 Answers  

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HOW TO CALCULATE THE CABLE SIZE FOR POWER CABLE, CONTROL CABLE AND INSTRUMENT CABLE

2 Answers   CA,

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star delta advantage and disadvantage?

2 Answers  

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An AC coil to give DC supply whats happen in the coil.what type of problem are create.

2 Answers  

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