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Electrical Code for 4-Wire Dryer Circuit

Where does it specifically state the change from 3wire to 4wire service?

NEC Electrical Code for 4-Wire Dryer Circuit
Background: Tom, a Electrician from Great Lakes Naval training Center, Great Lakes, IL

Question: What article in the NEC discusses wiring a residential dryer? 208V, 30A

Where does it specifically state the change from 3wire to 4wire service?

Dave’s Reply:
Thanks for your electrical question Tom.
The NEC reference is article 250.142(B) which specifies a 4 wire 30 amp circuit.

The Following links will assist you with your electrical question:

Electrical Wiring

For more information about Dryer Wiring
Wiring a Dryer and Power Cord
Dryer Wiring
Dryer Wiring
See an electric dryer installation with a typical 220 Volt electric power cord wiring system. You may find yourself with either a 3-wire or 4-wire electric dryer, or a 3-wire or 4-wire outlet. Lets look a how the electric dryer is wired and what to do if your cord does not match the plug.

This link is helpful as a Electrician
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