Heat Tape, Space or no Space?

[Annarose15]

I have 2 to 3 layers of foil tape on the edges of the heat tape to take some wear off of the tape from sliding tubs over it. I haven't had any problems at all in over 3 years.

The risk here (albeit unlikely), is that now the entire strip will transmit electricity through the foil if there is a loose connection or damage to the heat tape.