Kyoritsu 6010B User Manual download pdf (Page 23)

DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST

BEFORE OPERATING THE FUNCTION SWITCH

TO SELECT THE RCD OR UC TEST RANGE SELECT "RCD" OR "UC"

8.1 Purpose of the RCD test

The RCD must be tested to ensure that operation takes place quickly enough to

ensure that there is unlikely to be serious danger to a person experiencing an

electric shock from the system. This test must NOT be confused with that taking

place when the "test" button on the RCD is pressed; operation of the test button

simply trips the breaker to ensure that it is working, but does not measure the

time taken to break the circuit.

8.2 What does the RCD test really do?

The RCD is designed to trip out when the difference between the phase current

and the neutral current (this is called the residual current) reaches the tripping

value (or rating) of the device. The tester provides a carefully preset value of

residual current depending on its setting and then measures the time lapse

between the application of the current and the operation of the RCD.

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8. RCD/Uc TESTS

Fig 12

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Kyoritsu 6010B User Manual Page 23