Where does the ground wire go?

[LarryS]

I would have thought that you would NOT want a cage heater on a Residual current device. They have been known to trip for various non life threatening reasons at times.

If your animals health and possible life depends on the heat, wouldn't it be better off on a dedicated circuit?

I would think continuity and reliability would be more important for the animal. A normal snake enclosure would present an unlikely possibility of electrocution unless it is located in an area that is wet or it is required by code in this location.

I'm not disagreeing, just genuinely curious on this. I so agree that you should always go with the plan of highest safety, but in this case it seems like it could actually be a detriment to the animal??