Keep the power on when you press the yellow test button it should trip the power to indicate that it is functional. You should be testing this button quarterly any way!
Often true, but it gets more complicated when such a statement comes from he who said that it didn't matter if the main switch was 'off' when one pressed the test button . Doing that, even someone who had read the Important message would usually get a misleading result (albeit misleading in a safe direction)!
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