Thanks for your responses everyone. I'll let you know how this turns out.
I should have mentioned that this is for a motel that has a 5-foot overhang on 150 feet of roof and eavestroughs that needs the cables. Roofers will be installing 10 heating cables, with the possibility of adding more if required. We'll be installing a 100 amp 3-phase contactor controlled by a thermostat which in turn will supply a 100 amp 3 phase panel dedicated for the heating cables.
There's quite a bit of work here - which was why I wanted to confirm if it would work beforehand.
