Surge Arrester Fed by a Breaker

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Electriman

Senior Member
Location
TX
Greetings,

Has any body seen that a surge arrester (TVSS) in switchboard is fed by a breaker? Is it common? if so how do I need to size the breaker? I had seen them directly connected to main bus without a breaker in between.
 

LarryFine

Master Electrician Electric Contractor Richmond VA
Location
Henrico County, VA
Occupation
Electrical Contractor
Every one I've seen came with instructions to use a breaker, and mentioned the breaker size range.

What code-compliant connection allows direct connection, and how did you select conductor size?
 

topgone

Senior Member
Greetings,

Has any body seen that a surge arrester (TVSS) in switchboard is fed by a breaker? Is it common? if so how do I need to size the breaker? I had seen them directly connected to main bus without a breaker in between.

Breaker size is determined by the size of wire connecting the TVSS. Breakers are used as disconnect when servicing.
 

Electriman

Senior Member
Location
TX
Every one I've seen came with instructions to use a breaker, and mentioned the breaker size range.

What code-compliant connection allows direct connection, and how did you select conductor size?

Thanks. I had seen it directly connected to bus. I was just wondering which one is code compliant. Thanks
 

petersonra

Senior Member
Location
Northern illinois
Occupation
engineer
not all SPDs require OCPD. Some have it built into the device itself.

also breaker size is determined not by the wire size on the SPD but by the manufacturer's instructions.

also TVSS and surge suppressor are older terminology and no longer in the code.

there still are such things as lightning arrestors but they are different animals.
 
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