Answer / mskailash

lighting arrestor design is withstand only 1.5 or 2 times
of system voltage.if lighting is occur voltage and current
level is more it will bypass that voltage and current to
the earth.

Answer / rajnikanth

lightening works on the principle of corona discharge.the
sharp edges of the arrestor gets accumulated with charges
once a lightning of high voltage occurs.these charges are
then passed to the ground.

What is the difference between shortcircuit current, rated current of cable & MCB with example? What will be the size of cable required for 5.5 KW motor (Full load current 10 Amps approx.), Starting current with DOL is 120 Amps. Aprrox. Short circuit current with LLLG fault is 2000 Amps Approx.

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tell me about vfd

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