Before measuring a 480-volt cabinet, what must be verified about the meter and accessories?
- AThe meter is set to resistance on the energized circuit for the described C-10 installation and documented operating conditions
- BThe meter display is the worker’s favorite color
- The meter, leads, probes, and category rating are suitable and the meter is proven on a known source
- DThe leads have exposed metal for easier contact
Why C is correct
The best answer is: The meter, leads, probes, and category rating are suitable and the meter is proven on a known source. A suitably rated, intact instrument and live-dead-live verification reduce the risk of false zero readings and meter failure. Exposed probes or resistance mode on an energized system can cause injury and equipment damage. This transferred field condition tests the same installation or safety principle in a different project context. The other choices conflict with the cited rule, listing, safe-work process, or necessary diagnostic sequence.