Let now consider the individual tests.c.6, should earth fault occur. The
instrument is, therefore, calibrated give reading measured millisec-
onds in-service accuracy 10%. The instrument must, therefore,
simulate fault and measure the time taken for the RCD operate. The test made
with the supply disconnected, measuring from the consumer’s main pro-
tective earthing terminal the far end each CPC, shown Fig.
A d.
If you purchase good-quality ‘approved’ test instruments and leads from
specialist manufacturers they will meet all the Regulations and Standards
and therefore give valid test results.
1 Testing the continuity protective conductors (612. 14. Every
protective conductor must separately tested from the consumer’s main
protective earthing terminal verify that electrically sound and cor-
rectly connected, including the protective equipotential bonding conduc-
tors and supplementary bonding conductors.
Lights
Switches
Sockets
Extraneous
metal
Tester
Long test lead
Consumer’s
unit
FIGURE 14.2)
The object the test ensure that the CPC correctly connected, is
electrically sound and has total resistance which low enough per-
mit the overcurrent protective device operate within the disconnection
time requirements Regulation 411. test using ohmmeter continuity tester suitable where the protec-
tive conductors are copper aluminium 35mm2
.Basic Electrical Installation Work
352
RCD TESTER
Where circuits are protected RCD must carry out test ensure
that the device will operate very quickly under fault conditions and within
the time limits set the IEE Regulations.
.66
Testing continuity protective conductors.66. However, carry out all the tests
required the IEE Regulations will require number test instruments
and this will represent major capital investment the region £1000.4
