Fluke 165X Installation Manual page 44

To measure RCD tripping current
1. Turn the rotary switch to the I
Press 1 to select the RCD current rating.
2.
Press 3 to select the RCD type. Valid types are:
3.
•
E – Standard AC RCD, normal setting.
(All models)
•
F – DC sensitive RCD.
(Models 1652 and 1653 only)
•
E G – Delayed response AC RCD.
(All models)
•
F G – Delayed response DC RCD.
(Models 1652 and 1653 only)
Press 4 to select the test current phase, 0° or 180°.
4.
RCDs should be tested with both phase setting, as
their response time can vary significantly depending
on the phase.
Press and release T. Wait for the test to complete.
5.
•
The primary (upper) display shows the RCD trip
current.
position.
∆N
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 cannot be conducted at an outlet but can be done
at the electrical panel using probes. Use the connection
shown in Figure 17 when performing RCD testing on IT
electrical systems.
Mains Supply
PE (L2/Green)
L (L1/Red)
Figure 17. 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.
Electrical Installation Tester
Making Measurements
RCD
N (L3/Blue)
apx023f.eps
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