I went to the local electrical wholesaler and tried to buy Dux Seal. He said
no one uses that anymore. He advised me to use expanding foam or silicone
caulk to seal the conduit to the service panel. I think the Dux Seal advice
given me here is better advice. Expanding foam could be difficult to remove
and silicone caulk contains acetic acid, at least while curing and possibly
conductive. Also, using a metal caulking gun inside a live electrical panel
might be hazardous to my health. I think he simply doesn't have it in stock.
I'll keep looking for the Dux Seal.
Nearest Home Depot is 55 miles from here. Some Internet stores have it,
might be the best way to go. There is probably an electrical supply house in
Cookeville that would have it. Still a hike but only half the distance. I'm
in rural Tennessee. We do have a McDonalds, though, and Domino's delivers,
even up here on the mountain.
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