Verifying safe isolation from supply
272 NXAIR / ≤ 40 kA 110-0134.9 / 14
20.7 Verifying safe isolation from supply with the CAPDIS or VOIS device system
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.
Preconditions
• High-voltage door closed
• Door to the low-voltage compartment closed
• Indication "Operatinal high-voltage not present" visible
Safe isolation from supply is verified as soon as L1, L2 and L3 have been
determined to be isolated from supply.
20.8 Supplier information
Further information for the devices to get from:
VOIS+ / VOIS-R+ /
CAPDIS-S1+ / CAPDIS-S2+
Siemens AG / Order No.: 8DX1620
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