Primary and secondary current injection testing

[buddy91082]

For small molded case breaker frames rated 400 amps and below, would you typically test with primary and secondary injection? NETA ATS 2004 list these test under molded case type breakers but I am hearing from co workers that you do not typically perform these tests on molded case breakers.

Thanks.
B

 

[dpmac]

Are these thermal magnetic or electronic trip breakers? Do you mean Primary OR Secondary or test with BOTH Primary and Secondary?

As with all things one must weigh risk and reward. Most of my customers will not spend $1000 to test a $600 50A molded case breaker that feeds the wash room.
Some will spend that the money because they were told to do it.
Others would just buy a spare breaker.

If the 50A breaker feeds the lube oil pump to a $500,000 machine one may look at it in a different light.

 

[buddy91082]

These are electronic trip type breakers. And meant both primary and secondary tests.

 

[davidbeach]

If you've done primary injection tests there is certainly no need for secondary injection tests. Secondary injection is for when primary injection isn't possible.

 

[Zogzog]

No reason to do both. The trend in testing breakers is headed towards secondary injection with primary injection verification. Meaning you conduct one test on each phase via primary injection to ensure the entire trip system works correctly (Usually your LT) then test the other functions via secondary injection, this minimizes wear and tear on the breaker.

If the job requires testing to NETA specs then primary injection is required.