Remove the jumper on the dryer so neutral and ground are no longer connected at the dryer. Like measles resurfacing after vaccines beat it, NEMA 10 just won't die. Or what often happens is folks get a used dryer, and it already has the NEMA 10 plug, and so they just fit a NEMA 10 socket instead of a proper NEMA 14 plug. The last guy felt Very Strongly about saving $3.00 on buying 10/2 instead of 10/3, so he used the "old style" of wiring instead of the modern and proper NEMA 14 which has separate ground. It is grandfathered, allowed to continue in service where already installed, that as a result of appliance industry lobbying. Wires fail, and they shouldn't fail deadly, which is why it is no longer proper - and hasn't been for 40 years. This kills people, and it's unreported in the papers because it is called "miswiring" when it is in fact proper wiring that simply failed. The problem is the same as any bootlegging: if neutral breaks, things which are supposed to be safety-grounded are now danger-hot. They do not provida ground, and bootleg ground using neutral. The old 3-prong NEMA 10 receptacles, and their associated wiring, are bad news. So, replace this abomination with a fresh homerun of 10/3 and a NEMA 14-30 receptacle - you'll have to change the power cord on your dryer to a four-prong one, but that's a small price to pay for never having to worry about getting bit by your dryer again. The equipment are bonded to the equipment. (4) Grounding contacts of receptacles furnished as part of (3) The grounded conductor is insulated, or the groundedĬonductor is uninsulated and part of a Type SE service-entrance cable and the branch circuit originates at the (2) The grounded conductor is not smaller than 10 AWG Or 208Y/120-volt derived from a 3-phase, 4-wire, wye-connected system. (1) The supply circuit is 120/240-volt, single-phase, 3-wire The circuit for these appliances shall be permitted to beĬonnected to the grounded circuit conductor if all the following conditions are met.
Wall-mounted ovens, counter-mounted cooking units,Ĭlothes dryers, and outlet or junction boxes that are part of The outlet or junction box, the frames of electric ranges, That are part of the circuit for these appliances shall beĬonnected to the equipment grounding conductor in theĮxception: For existing branch-circuit installations only, where an equipment grounding conductor is not present in Of electric ranges, wall-mounted ovens, counter-mountedĬooking units, clothes dryers, and outlet or junction boxes
#WIRING A DRYER PLUG INSTALL#
The original installer was a massive cheapskate with no understanding of the NEC - even if the install was old enough to be grandfathered in under NEC 250.140 and friends, it still was a violation at the time of install as using an uninsulated wire for the neutral (grounded conductor) is only allowed when using type SE cable, not type NM as the original installer did:ĥ0.140 Frames of Ranges and Clothes Dryers. The connections on the wiring block are different than the ones in my machine and looks like I need some sort of a wiring connector plug which would fit in. Replace it with a homerun of 10/3 and a NEMA 14-30.
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