The wire I used is just your standard extension cord. The connectors I have had for a long long time I think I had them left over from when I was in the army. The heat tape is just soldered.
I don't know about the connectors from radio shack because I haven't looked at them. But the ones that look like mind that I have found at Home Depot are rated for 600 volts. The project box I got from Radio shack.
I will say some people at radio shack can be helpful. Others have no clue what they are talking about. I know I went there to get things to put together my STC-1000 thermostat and one of the people working there kept asking me all kinds of questions. This was the finish product of that project.
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