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More on the "transformers at IKEA" thoughts

One thing I forgot to mention in my last post is that car battery 
chargers are a fairly inexpensive way to get an undergravel heating 
cable power supply(especially if bought used or "broken").  Since 
many of them have a 6v-12v selector switch, one has the added 
option of controlling the heating wattage...

...and yes, these puppies are almost always fully isolated 

always remember - never lick the receptacle to see if the power is 
on!   ;-)