12 Safety instructions
connected to parallel stations, make sure that you also turn the applicable earthing
switches to the “earthed” position.
• Temporarily ground the switchgear terminals at all possible external power
supplies (grid and parallel stations). Refer to the user's manual of the
feeding/switchgear device. Lock the terminals and attach warnings.
• Temporarily ground the AC side of the inverters with a suitable temporary
grounding set.
7. Open the transformer door with the linked key of the V-module switchgear.
8. Make sure that the transformer is not energized (high voltage terminals, low voltage
terminals, any auxiliary power and instrumentation). Use a suitable high-voltage tester
only for the high-voltage side, and a multimeter with suitable testing heads for the low-
voltage side.
9. Make sure that you have a work permit.
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