Which statement regarding primary injection testing is accurate?

Primary injection testing is a method used to assess the functionality of circuit breakers and protective relays by applying a high current through the device to simulate actual fault conditions. The accuracy of the second option lies in its inclusivity of both electronic and thermal magnetic circuit breakers, which are essential in an electrical system’s protection scheme.

Electronic circuit breakers utilize electronic mechanisms to detect faults, while thermal magnetic circuit breakers combine both thermal and magnetic trip mechanisms. Conducting primary injection testing on both types verifies their operational reliability under fault conditions. This testing ensures that the circuit breakers will trip as designed to protect equipment and personnel.

The other points do not encompass the full scope of primary injection testing, as it is not limited to just one type of circuit breaker or solely focused on wiring. Additionally, this testing method is designed to provide insights into trip functionality, not just wiring tests, by evaluating the response and timing of the circuit breakers under simulated fault conditions.