Electricians rough in houses with romex all winter. I've seen it done
in temps near zero, so if you are in a room, you should be fine. If
it was 40 below I bet it wouldn't work real well. I would think the
outer insulation would crack in extreme cold temps, though I'm just
A few times I've roughed new houses when the temps were at about zero. The
coils of Romex were left on the job, so they're already frozen. You could
pull it, and work it, but you move it to quickly or whip it, or it would
crack. The plastic nail on boxes were worse than the cable. If you didn't
hit the nails dead on, you'd have plastic pieces all over the room. Frozen
CAT5 is worse than romex. Even in heated houses, when the box has been
sitting in my truck and it's really cold, it's incredibly brittle
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