1. Each appliance shall withstand without electrical breakdown, as a routine production-line test, the application of a 40-70 Hz potential between (1) the primary wiring, including connected components, and accessible dead-metal parts that are likely to become energized, and (2) between primary wiring and accessible low voltage (42.4 V peak or less) metal parts, including terminals.
METHOD I
The test potential shall be:
A. 1200 V for an appliance rated 250 V or less.
B. 1200 V plus 2.4 times the maximum marked voltage (but not less than 240 V) for an appliance rated at more than 250 V.
The test potential indicated above shall be applied for one (1) s.