article 230- 95 (c) ques?


Senior Member
article requires all equiptment ground - fault protection systems be tested when first the sq d instructions a note states if a complete check is necessary use primary injection testing. how is this performed?

jim dungar

Staff member
Retired Engineer
Primary injection testing means we actually run up to 1200A through the ground fault sensors. The actual steps depend on the actual equipment. During this test the neutral isolating link and the ground bonding jumper need to be 'manipulated, so a power outage is required.

The 'push to test' button on GF equipment is used to check the 'electronics' of the GF relay. The button does not perform a GF system test as required by most manufacturers and NFPA standards.


Senior Member
Electron Traffic Controller- Journeyman
Primary and secondary current injection tests are normally conducted to check the operation of breaker and their protective relays/devices.

The protective devices installed vary from circuit to circuit depending on the protection needs and philosphy but typical relays/devices include overload, over current, reverse power, earth fault, differential protection, etc.

Primary injection testing normally involves injecting the actual current required to operate a protective device power through the circuit breaker.