Microsens MS655033X - Manual (Page 12)

Grounding the PoE Injector
Follow the instructions below to attach the PoE Injector to ground.
When installing the PoE Injector, the ground connection must always
be made first and disconnected last.
ATTENTION
1. On the top of the device, locate and remove the dome screw which has
a ground symbol beside it.
2. Attach the ground wire to the screw hole with the dome screw.
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