ABB EasyLine Series Instructions For Installation Start-Up And Operation page 11

Risks of a Disconnected Protective Lead
Risks Involved in Opening the Covers
Risks Involved in Working with an Open Device
When Safe Operation can no Longer be Assured
The device can be hazardous if the protective lead is interrupted inside or
outside the device or if the protective lead is disconnected.
Current-bearing components can be exposed when the covers or parts
are removed, even if this can be done without tools. Current can be
present at some connection points.
All work on a device that is open and connected to power should only be
performed by trained personnel who are familiar with the risks involved.
If it is apparent that safe operation is no longer possible, the device
should be taken out of operation and secured against unauthorized use.
The possibility of safe operation is excluded:

If the device is visibly damaged,

If the device no longer operates,

After prolonged storage under adverse conditions,

After severe transport stresses.
Safety Information 11