Electrical Installation Safety Trainer
AD 1 - MI 3399
66
15mA) for all types of RCD available (10 mA … 1 A). This way we ensure that either
type of RCD will not be tripped during the measurement.
The measured voltage drop caused by the small test current is very small
– as a result,
even small voltage fluctuations can seriously influence the results. Voltage fluctuations
are mainly caused by load variations and switch on/off events on the mains.
To solve this problem advanced measuring techniques must be used that are beyond
the scope of this test.
Figure 2-16: Loop impedance measurement in a RCD protected system
2.3.2 Exercises
2.3.2.1 Exercise No. 2.3-1: Z
L-PE
and I
PFC
measurement on the supply
side
Measuring connection topology
Figure 2-17: Topology in a 1-phase TN system on the supply side
Even though there is a RCD installed the Z
LOOP
function may be used without fear of
tripping the RCD since the measurement is taking place on the supply side (Figure
2-17) where the circuit is not yet protected by the RCD.
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...
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