139-2021.9 / 07
NXAIR M
125
Verifying safe isolation from supply
16 Verifying safe isolation from supply
HINT
Read and understand these instructions before attempting operating works.
Before performing any kind of check or work in the busbar compartment or the connection compartment of
each panel, it has to be ensured that these compartments are safely isolated from supply.
To ensure the safe isolation from supply, use the three-phase capacitive voltage detecting system according
to IEC 61243-5.
16.1 Application of voltage indicators
DANGER
Electric shock
Always verify safe isolation from supply without any doubt
If safe isolation from supply is verified erroneously although operational high
voltage is still applied, there is danger to life.
Before performing any kind of checks or work in the busbar compartment
or the connection compartment of each panel, verify safe isolation from
supply in these compartments without any doubt.
Observe the
Five Safety Rules
.
To verify safe isolation from supply, do exclusively use intact LRM voltage
indicators that have been tested immediately before.
Please do absolutely observe the enclosed operating instructions for the
function test unit and the voltage indicator.
16.2 Overview of voltage indicating systems
As voltage indicators, two device systems are used:
CAPDIS
and
VOIS
device systems installed in the door to the low-voltage compartment
LRM
device system as an indicator with the associated measuring system installed below the door to
the low-voltage compartment
Fig. 209: Test sockets for feeder
Fig. 210: Test sockets for busbar
