Answer / harsh

neutral earthing is provided for internal winding faults while equipment earthing is body earthing to give human protection against any leakage current in m/c body....

Answer / p.vasudevan

neutral earthing is for to bye pass the leakage current or
fault current and avoid the system damage .

body earthing is for bye pass the fault current flowing
through the body ( cover , chain unit , shaft ) of the m/c .
mainly for to avoid the electric shock from the faulty current

Answer / k.prakashchandra

One is for neutral and the other is for metallic body of the
electrical equipments to remove the leakage voltage or for
protection.

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<

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