Fluke 1652C - RCD Testing in IT Systems; Measuring Earth Resistance

1652C/1653B/1654B
Users Manual
34
RCD Testing in IT Systems
RCD testing at locations with IT systems requires a special test procedure
because the Protective Earth connection is grounded locally and is not tied
directly to the power system.
The test is conducted at the electrical panel using probes. Use the connection
shown in Figure 18 when performing RCD testing on IT electrical systems.
RCD
Mains Supply
PE (L2/Green)
L (L1/Red)
N (L3/Blue)
apx023f.eps
Figure 18. Connection for RCD Testing on IT Electrical Systems
The test current flows through the upper side of the RCD, into the L terminal,
and returns though the PE terminal.
Measuring Earth Resistance
(Model 1653B and 1654B Only)
apx010f.eps
Figure 19. Earth Resistance Display/Switch and Terminal Settings