Note that the grounding wire can be a retrofit and it doesn't have to be a home run back to the service panel. (4) Grounding contacts of receptacles furnished as part of the equipment are bonded to the equipment. (3) The grounded conductor is insulated, or the grounded conductor is uninsulated and part of a Type SE service-entrance cable and the branch circuit originates at the service equipment. (2) The grounded conductor is not smaller than 10 AWG copper or 8 AWG aluminum.
(1) The supply circuit is 120/240-volt, single-phase, 3-wire or 208Y/120-volt derived from a 3-phase, 4-wire, wye-connected system. Frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and outlet or junction boxes that are part of the circuit for these appliances shall be connected to the equipment grounding conductor in the manner specified by 250.134 or 250.138.Įxception: For existing branch-circuit installations only where an equipment grounding conductor is not present in the outlet or junction box, the frames of electric ranges, wall-mounted ovens, counter-mounted cooking units, clothes dryers, and outlet or junction boxes that are part of the circuit for these appliances shall be permitted to be connected to the grounded circuit conductor if all the following conditions are met. Note that "grounded circuit conductor" is NEC-speak for the white neutral wire in your existing installation.Ģ50.140 Frames of Ranges and Clothes Dryers. Most AHJ require an electrical permit to wire this extension and what you propose will not pass inspection.įrom 2011 NEC below with my emphasis.
#4 wire dryer plug upgrade#
Since the 1999 NEC, if you modify this branch circuit to extend it then you need to upgrade it to a properly grounded NEMA 14-30 outlet or it will not meet code.
#4 wire dryer plug code#
does code require the entire circuit be redone to 4-prong? or does it require the just the new work to be 4-prong? Specifically, can I just extend as described, or. What are the minimum code requirements in terms of 3-prong versus 4-prong? Relocation plans are to use a junction box at the current location, then run 4-12 feet (depending on route) to a reinstall of the old receptacle. It also says that a 4 wire connection "must be used for mobile home installation", which is not our situation. It also contains: "NOTE: Since January 1, 1996, The National Electric Code requires that new construction utilize a 4 wire connection to an electric dryer." And it gives details for 3 wire and 4 wire connections with specifics on the OEM ground strap. Identify the plug type as per the house receptacle before purchasing line cord".
dryer power cord kit (not provided with dryer) UL rated 120/240V, 30A with 3 or 4 prongs. Printed installation instructions: "Materials you will need. It supplies our 2007-ish 3 prong problem-free dryer. In the our utility closet/room of our house, I will be moving our 3-prong dryer receptacle that is on a non-GFCI 30amp breaker. Examples:Ĭonverting a Samsung Dryer from a 4-prong cord to a 3-prong cord? I've read various posts here about the advantages of 4-prong over 3-prong, such as the dryer cabinet can become hot if there is an interrupt in the 3-prong neutral/ground.
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