After installation, which statement best reflects proper testing?

• A. All safety devices function and grounding is intact
• B. Grounding can be ignored if device is new
• C. Only voltage checks are necessary
• D. Insulation continuity is irrelevant

Answer: (A)

After installation, the most important testing is to verify that all protective devices operate correctly and that the equipment grounding path is continuous and intact. Ensuring safety devices function means confirming they respond as designed to fault conditions: protective devices trip or deactivate when required, and any interlocks or relays engage to prevent hazardous operation. Verifying grounding means checking that the equipment grounding conductor provides a reliable, low-impedance path back to the panel and earth so that any fault current is exposed and can trigger the protective device, keeping metal parts at a safe potential. These checks together prevent shock, fire, and equipment damage. Relying only on voltage checks misses whether the protective devices will actually function in a fault, and ignoring grounding on a new installation leaves a critical safety path unverified; insulation continuity tests are important too, but they do not substitute for confirming safe device operation and proper grounding.