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Do GFCI units need to be tested with an external tester?

external GFCI tested tester units
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Do GFCI units need to be tested with an external tester?

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No. The test button, which should be used daily, actually puts an imbalance between the hot and neutral circuits and self-tests the unit. If the test button fails to trip the GFCI, the unit should not be used. If an inspector does test a GFCI with an external tester, the GFCI should trip between 4 and 6 milliamperes, according to UL standards.

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