Site Check
The connection to the FC2000 is made using the instrument test lead which is fitted with a BS
1363 (13A) plug into the test socket. The selection switch is set to the RCD position and the
test instrument plugged into the FC2000.
1 × IΔn (30mA)
• The instrument is set to the 30mA and the 1 × IΔn (30mA) setting at 0º.
• The test is then carried out at the instrument.
The reading obtained on the test instrument should be between 37ms and 39ms subject to
the manufacturer’s tolerances.
The illumination of the 30mA LED on the FC2000 indicates that the test has been carried out
and the instrument output current is acceptable.
If the output current from the tester is outside the acceptable range then the tester may still
operate the RCD trip but the 30mA LED will not light. If this happens the test result obtained
(the displayed disconnection time) is not valid as the tester has failed to supply the indicated
test current.
The FC2000 automatically resets ready to test after a period of around 4 seconds when the
LED goes out.
• The instrument is then set to the 30mA and the 1 × IΔn (30mA) setting at 180º and the
above test repeated.
5 × IΔn (150mA)
• The instrument under test is then set to the 5 × IΔn 150mA setting at 0º.
• The test is then carried out at the instrument.
The reading obtained on the test instrument should be between 37ms and 39ms subject to
the manufacturer’s tolerances.
The illumination of the 150mA LED on the FC2000 indicates that the test has been carried out
and the instrument output current is acceptable.
If the output current from the tester is outside the acceptable range then the tester may still
operate the RCD trip but the 150mA LED will not light. If this happens the test result obtained
(the displayed disconnection time) is not valid as the tester has failed to supply the indicated
test current.
The FC2000 automatically resets ready to test after a period of around 4 seconds when the
LED goes out.
• The instrument is then set to the 5 × IΔn 150mA setting at 180º and the above test
repeated
½ × IΔn (15mA)
• The instrument under test is then set to the ½ × IΔn 15mA setting at 0º.
• The test carried out at the instrument.
• The illumination of the 15mA LED on the FC2000 indicates that the test has been
carried out and the instrument output current is acceptable.
• The FC2000 automatically resets ready to test after a period of around 4 seconds
when the LED goes out.
• The reading obtained on the test instrument should indicate that the trip did not occur
in the 2 second time period. (The reading shown will depend upon the test instrument
being used as this varies according to the manufacturer.)
If the output current from the tester is outside the acceptable range then the tester may still
indicate that the trip did not occur in the 2 second time period but the 15mA LED will not
light. If this happens the test result obtained is not valid as the tester has failed to supply the
indicated test current.
If satisfactory press the phase selection switch to change the test phase angle to 180º and
repeat above tests.
Ongoing accuracy record
The procedure given above for the site check may also be used to provide a record of
ongoing accuracy for the RCD test instrument.
This is possible because the test of the RCD instrument is carried out within the FC2000 unit
and is independent of any external influence.
The test should be carried out at regular intervals and the results recorded on the ongoing
accuracy record sheet for the instrument.
Refer to section 4.4 for examples of how to apply tolerances.
