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The main display shows that the fault current was applied for over 2000 milliseconds (2
seconds) without tripping the RCD. The secondary display confirms that this passes the
requirements of the BS7671.
In the event of the RCD failing the test and tripping within 2 seconds at half the rated current
the main display will show the trip time and the secondary display will show ‘FAIL’. A short 2
tone alert will also sound.
After displaying the result for a few seconds the tester will switch to the 180° phase polarity
setting in readiness for the next test. (Figure 6)
When both tests have been conducted at the x½ setting press the multiplier button to change
the test current to the x1 setting.
Press the test button to conduct a test at the x1 setting at 0°. The result will be shown as a
pass if RCD trips within 300ms. After displaying the result for a few seconds the tester will
switch to the 180° phase polarity setting in readiness for the second test at the x1 current
setting.
If the 30mA setting has been selected a x5 current option will be available by using the
multiplier button. This option is not available, or required, for other ratings.
30mA Automatic test
The Auto test function will set up the tester to automatically conduct all 6 tests by a single
press of the test button. All you have to do is reset the RCD after it trips. To auto test type A
RCDs press the RCD type button before starting the procedure.
Upon completion of the auto test routine the results for each setting can be recalled by using
the RCD-RECALL button to cycle through the routine.
Ramp test
Use the rotary switch to select the rating of the RCD.
Use the RCD type button to select the RCD type required.
Press the multiplier button until the symbol is displayed.
Press the test button to start the test. The fault current applied will increment in 3mA steps
until the RCD trips.
If nuisance tripping on a circuit is a problem this function can be used to retest the RCD with
other appliances systematically connected and removed.
For example a 30mA RCD may trip at 12mA on ramp test with an appliance connected
and then at 27mA with the appliance removed. You will know that the appliance is leaking
approximately 15mA.
