admiralteal , to Do It Yourself in Running Electrical Wire through insulation

Romex on a 15A breaker is simply not going to get meaningfully hot, even under worst-case scenario loads and even fully insulated in something entirely flammable. If you're very nervous, size it up to -- it will cost slightly more but be even more totally safe. Overbuilding is (should be) the DIYer's creed.

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