OSHA 1910.404 requires two tests, what are they?

OSHA 1910.404 requires two tests, what are they?

• A. Continuity test and polarity test
• B. Continuity test and insulation test
• C. Polarity test and ground-fault test
• D. Insulation test and continuity test

Answer: (A)

The requirement focuses on making sure wiring is correct before energizing equipment by performing two basic checks: continuity and polarity. A continuity test confirms there is an unbroken path for current from the source through the conductors to the load, ensuring there are no open wires or broken connections that could cause unexpected energization or overheating. A polarity test verifies that the hot and neutral are wired correctly and that the grounding/earth conductor is properly connected, so exposed metal parts don’t become live and safety devices will function as intended. These two checks together help ensure a safe and correctly wired setup. Insulation testing or ground-fault testing are not the two tests specified in this requirement.

The requirement focuses on making sure wiring is correct before energizing equipment by performing two basic checks: continuity and polarity. A continuity test confirms there is an unbroken path for current from the source through the conductors to the load, ensuring there are no open wires or broken connections that could cause unexpected energization or overheating. A polarity test verifies that the hot and neutral are wired correctly and that the grounding/earth conductor is properly connected, so exposed metal parts don’t become live and safety devices will function as intended. These two checks together help ensure a safe and correctly wired setup. Insulation testing or ground-fault testing are not the two tests specified in this requirement.