there is no ground ( earth ) on the AC side by design. The housing is water tight and double insulated. The only way your going to ground that device is to open it up and solder a ground wire to the internal frame. It is by design that it does not have or need a ground as per Class Two rating. The only path to the frame of the light, etc, for the AC current would be by a severe internal short, which would blow the breaker/fuse. The housing itself it an insulator rate plastic.
I'd recommend getting the HLG series driver if you feel uncomfortable using LPC drivers, the HLG includes an ground wire for the AC side