Nec Wire Size Chart
Nec Wire Size Chart. To calculate the load requirement for a circuit, first add up the wattage of all the electrical devices that will be on the circuit. THHN wire refers to thermoplastic high heat nylon wire.
If you're in the United States, you'll probably stick to the National Electrical Code (NEC). THHN wire refers to thermoplastic high heat nylon wire. It also has a heat-resistant jacket made of nylon, making it even more popular.
This type of wire is made from PVC or polyvinyl chloride insulation.
The number of devices connected to the circuit usually determines how much current will flow through the wire.
To calculate the load requirement for a circuit, first add up the wattage of all the electrical devices that will be on the circuit. THHN wire refers to thermoplastic high heat nylon wire. It also has a heat-resistant jacket made of nylon, making it even more popular.
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Thomas Branstetter
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