METREL MI 3125 - PE Test Terminal: Fault Detection

MI 3125 EurotestCOMBO PE test terminal
45
5.9 PE test terminal
It can happen that a dangerous voltage is applied to the PE wire or other accessible
metal parts. This is a very dangerous situation since the PE wire and MPEs are
considered to be earthed. An often reason for this fault is incorrect wiring (see examples
below).
When touching the TEST key in all functions that require mains supply the user
automatically performs this test.
Examples for application of PE test terminal
L1
N
PE
Reversed phase and
protection conductors!
T MOST DANGEROUS
SITUATION!
HE
Figure 5.37: Reversed L and PE conductors (application of plug commander)
L1
N
Reversed phase and
protection conductors!
MOST DANGEROUS
SITUATION!
PE
LPEN
L
/
L
1
N
/
L
2
P
E
/
L
3
Figure 5.38: Reversed L and PE conductors (application of universal test cable)