Siemens NXAIR - Verifying Safe Isolation from Supply with the LRM Device System

Verifying safe isolation from supply
268 NXAIR / ≤ 40 kA 110-0134.9 / 14
20.5 Verifying safe isolation from supply with the LRM device system
DANGER
Electric shock
Always verify safe isolation from supply without any doubt
If safe isolation from supply is verified erroneously although operational 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.
Preconditions
• High-voltage door closed
• Door to the low-voltage compartment closed
• Tested LRM voltage indicator available
Procedure
Remove the cover from the test socket. The cover remains permanently at the panel.
Plug the LRM-ST voltage indicator on the test socket.
Fig. 489: Cover removed from
test socket L1
Fig. 490: LRM-ST
voltage indicator at L1
Read the voltage indication at the LRM-ST.
Fig. 491: LRM-ST indication