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Thhn Wire Gauge Chart

Thhn Wire Gauge Chart - Quick question, is it permissible to pull thhn for an underground feed (the wires will be installed in pvc in the ground)? The only nec reference i've found for conductor bending radius is only for 1000v (600v in earlier versions) or greater. Just want to make sure i have this right, if. Requirements for over 1000 volts,. Southwire could make this clearer by putting on the product label. Single conductors specified in table 310.104 (a) shall. Thhn is rated for 90 degree c and thwn is rated for 75 degree c but both of these ratings can be listed on the same wire. In a related question, when using expansion joints for. Thhn is what we typically use and it is rated for 90 degrees c. I understand that almost all terminal s have 75 degree rating but how does that affect the ampacity of the wire.

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