Testing
RCDs can be tested with the built-in test button to confirm functionality on a regular basis. RCDs if wired improperly may not operate correctly and are generally tested by the installer to verify correct operation. Use of a solenoid voltmeter from live to earth provides a external path and can test the wiring to the RCD. Such a test may be performed on installation of the device and at any "downstream" outlet.
Read more about this topic: Residual-current Device
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—Bible: New Testament, 1 Corinthians 10:13.
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—David Webb Peoples, U.S. screenwriter, and Ridley Scott. Rachel, Blade Runner, being tested to determine if she is human or machine (1982)