Electrical Installation Safety Trainer
AD 1 - MI 3399
42
Optional in IT systems in each circuit as additional protection in case a second
fault occurs after first already present.
1.4.4.1 RCD trip-out time test
With the trip-out time test, the correct operation of the RCD is verified. Conditions:
- Successful trip out of RCD.
- Trip out time t
N
at I
N
lies inside predefined limits.
Trip-out times are measured at 0.5 I
N
, 1 I
N
, 2 I
N
and 5 I
N
.
For the trip-out test to pass the RCD must trip-out according to the limits defined in
Table 1-3.
RCD type
RCD test current
½
I
N
I
N
2
I
N
5
I
N
General (non-
delayed)
No
trip
out
t
< 300 ms
t
< 150 ms
t
< 40 ms
Selective
(time-
delayed)
No
trip
out
130 ms < t
< 500
ms
60 ms < t
< 200
ms
50 ms < t
< 150
ms
Table 1-3: Trip-out times according to IEC 60364-4-41
1.4.4.2 RCD trip-out current test
With the trip-out current test, the correct operation of the RCD is verified. Conditions:
- Successful trip out,
- Current I
and trip out time t
@ I
(current at which RCD is tripped out) lie inside
predefined limits.
A continuously rising residual current I
is intended for testing the threshold sensitivity
for RCD trip-out. The test passes if the RCD trips-out at currents according to 2.4.
RCD type
Slope range
Waveform
Start value End value
AC
0.5
I
N
1.0
I
N
Sine
A (I
N
30 mA) 0.35
I
N
1.4
I
N
Pulsed
B
0.5
I
N
2.0
I
N
Table 1-4: Trip-out currents according to IEC/TR 60755
1.4.4.3 RCD trip-out contact voltage test
With the trip-out contact voltage test, the correct operation of the RCD is verified.
Conditions:
- Successful trip out,
- Measured earth resistance of the object must be lower than described in 1.4.5
Summary of Contents for MI 3399
Page 27: ...Electrical Installation Safety Trainer AD 1 MI 3399 27...
Page 46: ...Electrical Installation Safety Trainer AD 1 MI 3399 46 3 Exit settings...
Page 74: ...Electrical Installation Safety Trainer AD 1 MI 3399 74...
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