I have actually a generator the I want to have the ability to run most of the house on in the event of a hurricane, ns live in SE Texas.I additionally have a couple of welders that ns plug right into my dryer outlet via 8/2 Romex.So I have actually an extension cord for my welders, 25 feet, 3 prong come 3 prong.My generator has a mrs 4 prong outlet. My inquiry is just how do I use a three wire cable, one is ceiling ground to the 4 prong plug the I just bought?I would rather not need to buy an additional cable and readjust the dryer outlet if i don’t have actually to.Thanks.

You are watching: 3 prong generator to 4 prong outlet


electric 240v generator
share
improve this concern
follow
request Jul 23 "20 at 22:04
*

invoice CareyBill Carey
1111 gold badge11 silver- badge22 bronze badges
5
add a comment |

2 answers 2


active earliest Votes
4

I dislike to rest it to you...

But this really needs to it is in done much better than what you plan.

Let"s tackle the large ones first.

There must be one interlock to safeguard linemen

Electricity is distributed at high voltage (50,000V) i beg your pardon is knocked down to medium (10,000V) in ~ a transformer, then down to 120/240V at one more transformer.

It"s absolutely possible for a generator to press electricity ago out top top the grid. When it will a transformer it"ll simply go v in reverse, so her generator will cause a 10,000V ar to irradiate up in ~ 10,000 volts. And that will "light up" the linemen who"s the end there at 4am away from family working to obtain your power back on.

Some think about that impolite.

A lot of homeowners acquire this genius idea the they"ll just have a procedure: "Turn THIS off, then plug in THIS, then begin the gen, then revolve on THAT". They"ve acquired it all operated out. Yet when The Stuff hits The Fan and the pressure"s on in the rainy dark to obtain the lamp on, fog that war, the ain"t working, do the efforts anything, or you"re away and the mam asks the neighbor to help. The lengthy experience of accident investigators is the procedure lists just Don"t Work.

As such, a line-generator interlock is mandatory.

For a many panels, this is in reality pretty straightforward - I had somebody who had actually run the end of circuits top top a klutzy $550 10-switch Reliance carry switch, and the panel was a Siemens. I instantly establish the Reliance was unnecessary, the totality panel might be switched through an ECSBPK01 interlock (go price that lol) or maybe an ECSBPK02 if >125A was needed. Also with the needed breakers it"d have been under $100.

Get united state some pics of her panel, and we have the right to see if there"s one equally easy answer because that yours.

No self-destruction Cords. Ever. Use an inlet.

You don"t want to ever before have a cord that has males (pointy ones) on both ends. It is a issue of time prior to tragedy happens. things which take power have actually pointy ends, so "your house" should have actually the pointy ends. You must not be using a regular socket and a suicide cord, you have to be utilizing a "reverse socket" referred to as an inlet, and a normal cord.

When the inlet is merged with the interlock, the is impossible for the prongs to ever be energized. This renders it safe.

There are 2 ways to get an inlet. First, they sell actual inlets, that mount whereby you please and look a lot favor a socket but have prongs rather of holes. They can be a little pricey.

So instead you can just usage literally a cord and plug. You have to terminate the functional cord in a junction box with a strain relief. And you need to put some thought into staying clear of physical damage when the cord"s not in use. However it"s just that basic to Git-r-Dun.

Yeah, it"s legitimate for functional cordage come be part of a building"s wiring, if it"s something that is typically connected, disconnected or moved. NEC 400.6-8 what in there.

Permanent wiring, done temporarily

Very regularly I need a circuit to operate for a couple of hours. I just use proper permanent wiring approaches so it"s ok to run forever. Then, once the crisis is over, i undo all the wiring and adjust it back.

This has actually the elegance of making the "interlock" question moot, because you space de-wiring the circuits from the grid.

Knock a knockout the end of the next of my panel, operation a cord indigenous the generator right into it, placed a cable clamp ~ above it. Legal. Once the power fails, revolve the main off, take the cover off the panel, identify the circuits I want to power, pull their hots and also neutrals off the breakers and bars, and nut them to the generator hot and also neutral. Close increase the panel. Now those circuits are permanently rewired to operation of generator only.

Or, if there was a disconnect come de-energize the key feed coming into the panel, I"d execute that. Climate yank the key feed warm wires off and also cap "em off. I"d connect the generator supply wires there, and button the panel ago up. Now the entirety panel is permanently rewired to operation off generator only. Of food as soon as the strength returns, I"d turning back it.

All the stuff I"m saying is password legal, other than the first one if you are connecting 15A or 20A branch circuits to a 30A generator breaker, that"s over-fusing obviously. Yet it may come under to choosing your code violation wisely.

Romex/NM cable as cordage

You"re acquainted with cordage; it"s appliance cords. It"s stranded and really flexible and durable. You"re supposed to use that for short-lived or versatile cables e.g. Come appliances or in between generators and inlets. It"s also much more expensive.

Romex/NM/UF cable must not be provided for that, because it is solid wire - it"s not flexible, and also repeated flexing will fatigue and break it. It"s additionally not made to be underfoot, traction on, or any kind of of the day-to-day indignities that cordage ill daily.

Use the Romex to operation in the wall surfaces to the panel, or an secluded run in between an outlet and also inlet/cord/plug. For instance once you upgrade your dryer socket, you can use the #10 Romex to continue as irreversible wiring to a convenient place for a welder receptacle. Transforms out you deserve to have 2+ 30A receps ~ above the exact same circuit.

But speak of that...

That old NEMA 10 dryer recep is dangerous together heck

We see loosened neutral wires on here all the time.

Now, it"s typical for civilization to "bootleg ground" where (at one outlet) they attach ground come neutral for this reason the tester reads good. The difficulty with a bootlegged floor is, if you obtain a loosened neutral wire, the neutral floats in ~ 120V and so does the ground/chassis the the machine.

Now, the obsolete NEMA 10 uses hot-hot-neutral. No ground. However when grounding came along, the appliance manufacturers asked come be permitted to simply connect the appliance chassis come neutral. Well, that"s bootlegging ground! and yeah, it has actually the very same problem, and also from time come time, this death somebody.

However this is easy to fix. #1 readjust the dryer cord come 4-prong NEMA 14-30, and remove the inner bootleg jumper from the dryer. #2 operation a plain old #10 ground wire from the dryer socket junction box back to the dashboard or any type of other #10 ground wire going back to the panel... Water heater, grounding electrode, steel conduit, whatevs. #3 adjust the socket come NEMA 14-30.

See more: Unit Of Heat; Measurement Of Food Energy, How Are They Measured In Food

Once it"s changed to 14-30, it"s legal come use through both dryers (hot-hot-neutral) and welders (hot-hot-ground). Because it has both.