Answer / praadeep_dd@yahoo.com

A sphere gap is a type of voltmeter. It contains 2 spheres
one of it is connected to Earth n second is connected to the
point of which voltage is to be measured. The gap between 2
spheres is reduced till a breakdown takes place. After a
break down the gap is measured n the gap is compared with a
standard table.
Eg. if B/D takes place at 2mm then the voltage recorded in
standard table for 2mm is known.

We have a couple of oil tanks at our plant. One of them does not have a lightning arrester installed. My question is it necessary to install an arrestor on every tank or will this particular one be covered by the arrestor installed on the ajdacent tank, Since all the tanks are close to each other. Basically, I want to know that if these arrestors or protection works in a parituclar area of effect or influence. Thanks

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