Using heat cable on PVC drain????

[mailman62]

I ran a 1inch pvc drain pipe off a overhead pump up through attic for a washer (runs straight up from pump into attic then 45 degrees for about 4 ft before angling down to drain area. I'm concerned about freezing ofthe water left in the pipe in the attic of that 4 ft section since it can't drain cause of the pitch. Cold here in ne. Can I use a thermostat controlled heat cable on a pvc drain pipe?

 

[Cacher_Chick]

Heat cable/heat tape and plastic piping were never intended to be used together.