Answer / koti

It is not minimum but maximum which is less than 1 ohm.

Answer / jithendra

static earthing is to be below 2 ohms.
plc & transformer neutral earthing is to be below 1 ohm.

lighting earthing will also come under static earthing

Answer / kanhaikumar

25 ohms

Why in USA supply voltage parameters(230V,60Hz)are different,is there any advantage please brief.

1 Answers   APC, DRJ ARDE,

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How to calculate per unit impedance of transformer?

0 Answers  

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What is the intent of short circuit studies?

3 Answers  

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I have raw material for making Compact-Choke for flourscent lamp of 40 Watts. We are suppose to get 0.4 amps output at end. but we are getting 0.42 or 0.44 amps and above. We have done many testings in different but nothing worked out. Please suggest me how to get the correct output. We are using 1. core winding of 700 windings of aluminium 2. E-shape iron fillings and I-shape iron fillings to surround the winding.

6 Answers  

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How to size fuse? How to size MCB?

0 Answers  

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how to find Harmonics and types as per the equipemnts

0 Answers  

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if the stetor speed (N S) increase by 20% then the rotor speed will be increased by 20% is it true. ?

4 Answers  

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What are the types of AMF(auto main failure) panel.

1 Answers  

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Give some example of fault limiting devices?

0 Answers  

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How to set the star delta timer setting?

1 Answers   Integra,

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what is the voltage between nutral and earth?

2 Answers  

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give me applications of sequence bridges . (used in 3 phase un balanced systems)

0 Answers  

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