Fluke 1662 User Manual page 52

RCD type B, B+ (.) or S-type B, B+ (. G) are actually two RCDs, one with
type A/AC behavior and one with type B. The type B RCD is correctly tested
only with the trip current (ramp) test. For trip time measurements, even with
type B selected, the ac part of the RCD might cause the tripping because of the
initial step of the test current. Fluke recommends that you do a trip current test
with type B and a test with type A/AC waveform.
To prevent possible electrical shock, fire, or personal injury:
•
Test the connection between the N-conductor and earth
before you start the test. A voltage between the N-conductor
and earth may influence the test.
•
Leakage currents in the circuit that follow the residual
current protection device may influence measurements.
•
The displayed fault voltage relates to the rated residual
current of the RCD.
•
Potential fields of other earthing installations may influence
the measurement.
•
Equipment (motors, capacitors) connected downstream of
the RCD may cause considerable extension of the tripping
time.
If the L and N terminals are reversed, the Tester will
automatically swap them internally and continue tests. If the
Tester is configured for UK operation, tests will stop and you
will need to determine why the L and N are swapped. This
condition is indicated by arrows above the terminal indicator
symbol (b).
Type A and type B RCDs do not have the 1000 mA option
available. Type B RCDs do not have the Var option available.
When testing under a condition that would trip an RCD, but
does not (for example, reading is >310 ms), check the
connections, leads and fuses.
To measure RCD tripping time:
Turn the rotary dial to the ΔT position. See Table 16.
1.
Electrical Installation Tester
XW Warning
Note
Measurements
43