Kyoritsu 6010A User Manual download pdf (Page 23)

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7. RCD TESTS

DISCONNECT THE INSTRUMENT FROM THE CIRCUIT UNDER TEST

BEFORE OPERATING THE FUNCTION SWITCH

TO SELECT THE RCD TEST RANGE SELECT“RCD”

7.1 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.

7.2 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.

7.3 RCD testing

1．Press the test button once. Then, the instrument switches on.

2．Set the RCD rated tripping switch to the trip rating of the RCD under test.

3．Set the function switch to X1/2 for the "no trip" test, which ensures that the

RCD is operating within its specification and is not too sensitive.

4．Set the "LOOP/RCD" switch to 0

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5．Connect the instrument to the RCD to be tested either via a suitable

socket outlet（see fig 9）or using the OMA DIEC test lead set（see fig

10）.

6．Make sure that the P-E and P-N wiring check lamps are lit and the wiring

incorrect LED is not lit. If they are not, disconnect the tester and check

the wiring for a possible fault.

7．If the lamps are correctly lit, press the test button to apply half the rated

tripping current for 2000 ms, when the RCD should not trip. The PN and

PE LEDs should remain on indicating the RCD has not tripped.

8．Repeat the test with the "LOOP/RCD" switch at 180

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9．In the event of the RCD tripping, the trip time will be displayed, but the

RCD maybe faulty.

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Kyoritsu 6010A User Manual Page 23