MI 3110 EurotestIM
Measurements
– a.c. LV IT installations
38
5.6 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. A common 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.
Example for application of PE test terminal
Figure 5.21: Reversed L and PE conductors (application of 3-wire test lead)
PE terminal test procedure
❑
Connect
3-wire test lead or mains measuring cable to the instrument.
❑
Connect
3-wire test lead or mains measuring cable to the item to be tested (see
❑
Touch PE test probe (the
TEST
key) for at least one second.
❑
If PE terminal is connected to phase voltage the warning message is displayed
and instrument buzzer is activated.
Warning:
❑
If line voltage is detected on the tested PE terminal, immediately stop all
measurements, find and remove the fault!
Notes:
❑
PE test terminal is active in Zline and
ΔU functions, but does not inhibit selected
test if voltage is detected.
❑
PE test terminal does not operate in case the operator’s body is completely
insulated from floor or walls!
