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2.4 Five safety rules according to DGUV Regulation 3
The following rules must be strictly observed!
1.Disconnect:The entire system to be worked on must be disconnected from the power supply at all poles.
2. Secure against reconnection: Attach information signs to the disconnected operating equipment stating:
What has been disconnected.
Reason for the disconnection.
Name of the person who made the disconnection.
Reconnection must be prevented using a suitable lock (e.g. padlock).
3. Prove dead (authorised skilled personnel only):
Check voltmeter just before use.
Prove dead on all poles at the disconnection point.
Prove dead on all poles at the work area.
4. Ground and short-circuit:Allelectricalpartsattheworkareamust be grounded and then short-
circuited.
5. Cover or block off adjacent live parts:Ifthereisliveequipmentadjacenttotheworkarea,itmustbe
covered using appropriate materials (e.g. insulation blankets / plates).
DANGER
Warning of dangerous electrical voltage! Warning of dangerous electrical voltage! Danger of
electric shock!
Beware of a possible external power supply! BEFORE connecting and disconnecting it must be
checked that no voltage is present at the controller! Connections/plug connectors of the device may
only be plugged in, removed and/or wired when no voltage is present.
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