Verifying safe isolation from supply
110-0134.9 / 14 NXAIR / ≤ 40 kA 267
20.4 Verifying proper functioning of LRM-ST voltage indicator
To verify proper functioning of the LRM-ST voltage indicator, use the battery-operated function test unit
(optional).
Fig. 488: Function test unit for LRM-ST voltage indicator
Preconditions
• Function test unit available ready for operation on LRM-ST voltage indicators
• LRM voltage indicator available to be tested
Procedure
Plug the contact pins of the LRM-ST voltage indicator on the test sockets at the function test
unit.
Alternative test method
If no function test unit is available to check the LRM-ST voltage indicator, the check must be executed on a
live panel.
Procedure
Remove one cover from the test sockets. The cover remains permanently at the panel.
Plug the contact pins of the LRM-ST voltage indicator on the test sockets at the panel.
The test of the LRM-ST voltage indicator is completed. If the voltage indicator does not pass
the function test, do not use this voltage indicator to verify safe isolation from supply.
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