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

165XB

Users Manual

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.