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Surge/Lightning Protection

Surge/Lightning Protection

Surge/Lightning Protection

(OP)
I work with a lot of smaller facilities with low voltage electrical services(200-1000A) and I sometimes see a Secondary Surge Arrestor (MOV type) or lightning arrestor (spark gap type) on the line side of the main breaker.  

This is usually in addition to a TVSS (Transient Voltage Surge Suppressor, MOV type) on the load side of the main breaker.

Now, I'd like to know whether or not it is worth installing a secondary surge arrestor since the TVSS units have higher surge ratings and lower clamping voltages.  I guess the surge arrestor on the line side will protect the cables even if the breaker trips, and redundancy doesn't hurt.

Any thoughts?

Thanks

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