Technical FAQs

Ask a Question

Can the ground fault function be defeated for primary injection testing on Masterpact NT breakers?

Issue:
Is there a way to defeat ground fault on the Masterpact NT breakers in order to perform primary injection testing?

Product Line:
Circuit Breakers

Resolution:
There are three ways to defeat ground fault on the NT breaker. The hand held and full function test kits can both be used to defeat ground fault. If neither of these devices are available, the "looping method" will have to be employed for primary injection testing. In this method, jumpers are added line and load to so that each pole may be tested separately. The below drawing shows looping when testing A phase. For B and C phases, move jumpers as necessary.

Was this helpful?
What can we do to improve the information ?