Electrical Installation Tester
Measurements
53
The test current flows through the upper side of the RCD, into the L terminal,
and returns through the PE terminal.
To test an RCD at the mains socket, put the Tester into the IT mode (Power-on
option: + ). In this mode the Tester accepts any voltage between N and
PE. The precondition for trip time and current measurements is that the
resistance of the earth ground system is low enough to allow the test current
flow.
If RCD does not trip, use the single test lead configuration. See Figure 9.
L1
L2
RCD
PE
hwl053.eps
Figure 9. Single Test Lead Configuration
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