MI 3000 EasiPLUS Measurements
48
5.8 Testing the PE terminal
In new or adapted installations it may occur that the position of the PE conductor and
the phase conductor become reversed – this is a very dangerous situation! This is why
it is important to test for the presence of a phase voltage on the PE protection terminal.
This test should be performed before a mains supply voltage is applied to the
instrument circuitry and before installation is used.
For additional information concerning PE terminal test, refer to Metrel’s handbook
Measurements on electric installations in theory and practice.
How to test PE terminal
Step 1 Connect test cable to the instrument.
Step 2 Follow the connection diagrams shown in figures 5.42 and 5.43 to test PE
terminal.
L1
N
PE
Reversed phase and
protection conductors!
MOST DANGEROUS
SITUATION!
Figure 5.42: Connection of plug cable to mains outlet with reversed L and PE
conductors
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