Fluke 1650B [36/62] Rcd testing in it systems

Fluke 1650B [36/62] Rcd testing in it systems
165XB
Users Manual
28
3. Press 3 to select the RCD type. Valid types are:
E – Standard AC RCD, normal setting.
F – Pulse current sensitive RCD (Type A).
(Models 1652B and 1653B only)
E G – Delayed response AC RCD.
F G – Delayed response pulse current sensitive RCD.
(Models 1652B and 1653B only)
4. Press 4 to select the test current phase, 0° or 180°. RCDs should be
tested with both phase settings, as their response time can vary
significantly depending on the phase.
5. Press and release T. Wait for the test to complete.
The primary (upper) display shows the RCD trip current.
If the trip current is according to the appropriate standard of the RCD
and the fault voltage is below the chosen limit (25V, 50V), the RCD W
indicator displays. For more information, see Maximum Trip Time
Table on page 50.
To measure RCD tripping current for a custom RCD setting - VAR mode:
1. Turn the rotary switch to the I
ΔN
position.
2. Press 1 to select the VAR current rating. The current custom setting
shows on the primary display. Use the U arrow keys to adjust the value.
3. Repeat steps 3 through 5 listed in the preceding RCD tripping current
procedure.
4. To view the nominal test setting, depress the U arrow key.
Note
The maximum setting for RCDs is 700 mA.
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 17 when performing RCD testing on IT electrical systems.

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