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?
Thanks!

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
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
Electrical Code Articles

» You Can Avoid Costly Mistakes! « Here's How to Do It: Wire It Right with the help of my Illustrated Wiring Book Great for any Home Wiring Project. Complete Guide to Home Electrical Wiring Perfect for Homeowners, Students, Handyman, Handywomen, and Electricians Includes: Wiring GFCI Outlets Wiring Home Electric Circuits 120 Volt and 240 Volt Outlet Circuits Wiring Light Switches Wiring 3-Wire and 4-Wire Electric Range Wiring 3-Wire and 4-Wire Dryer Cord and Dryer Outlet How to Troubleshoot and Repair Electrical Wiring Wiring Methods for Upgrading Electrical Wiring NEC Codes for Home Electrical Wiring ....and much more.

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Electrical Wiring and Electrical Repairs Unless otherwise posted, please refer to the following Guidelines for Electrical Projects: Skill Level: Intermediate to Advanced - Electrical Repairs and Circuit Wiring is Best Performed by a Certified Electrician or Licensed Electrical Contractor. Find An Electrician Electrical Tools Required: Basic Electricians Pouch of Hand Tools, a Voltage Tester and a Multi Meter. Estimated Time: Depends on personal level experience, ability to work with tools, work with electrical wiring, and the available access to the project area. Precaution: Identify the project circuit, turn it OFF and Tag it with a Note before working with the wiring. Important: Modifying existing electrical circuits or installing additional electrical wiring should be done according to local and National Electrical Codes, with a permit and be inspected.

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