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Thhn Amp Chart

Thhn Amp Chart - Thhn is what we typically use and it is rated for 90 degrees c. In a related question, when using expansion joints for. Southwire could make this clearer by putting on the product label. The plain thhn had a higher temperature rating, significant when the conductors carry close to their rated amperage or the conduit or a drilled hole is stuffed with wires close to. The only nec reference i've found for conductor bending radius is only for 1000v (600v in earlier versions) or greater. I understand that almost all terminal s have 75 degree rating but how does that affect the ampacity of the wire. Just want to make sure i have this right, if. Requirements for over 1000 volts,. 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. However, after looking in the code book, article 300.3 (a), states:

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