Seaward 300 PrimeTest - Manual (Page 52)

PrimeTest 300 Operating Instructions
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While the PrimeTest 300 performs the test the LCD will
show 0.0Ω flashing. When the test is complete the
measured value will be displayed.
11.7 RCD Trip Time
Refer to Fig 8
This test is applicable to the mains electrical
installation.
This test will pass a sinusoidal current of 30mA down
the earth conductor and measure the time it takes for
the mains supply to trip.
Warning: The black probe must not be used
when performing an RCD test.
Fit the power lead supplied to the PrimeTest 300 and
plug the other end into the mains outlet under test. To
start the test, press the green START button. The
PrimeTest 300 will produce a test current of 30mA r.m.s
in the protective earth of the supply. The test will
commence at the start of a positive half cycle.
The RCD will trip. The time taken to trip will be
displayed.
Reset the RCD. When the PrimeTest 300 detects that
power has been re-applied it will commence the
negative half cycle test. The PrimeTest 300 will again
produce a test current of 30mA r.m.s in the protective
earth of the supply. The test will commence at the start
of a negative half cycle.
The RCD will trip. The time taken to trip will be
displayed.