Connect 120 volt circuits to get 240 volts

I did describe a shock hazard scenario :)

It's an edge case and the liklihood is low, but that's a common factor in many famous accidents :-|

We are talking about plugging extention cords into outlets, not about house wiring. Does the NEC address that?

What a bunch of wusses.

Using an extension cord is a CODE VIOLATION? What code?

Do the math. Milligauss.

There's a youtube vid that found out how much difference it made taking wires out through different holes in a metal CU. The resultant heating was 2C at 118A.

NT

Using one extension cord in two outlets is a CODE VIOLATION.

can't multiply power.

er than running wires from different rooms. Both are CODE VIOLATIONs anywa y.

More stuffs for you to read:

HS04-014A (1-06) Don?t plug one extension cord into another. Don?t run extension cords through doorways, holes in ceilings, wall s, or floors.

The purpose of this national electric code is to reduce the use of extensio n cords. From any point along a wall line, a receptacle outlet needs to be within reach of a 6-ft. appliance cord, and that 6 ft. cannot be measured a cross a passageway. The bottom line is that extension cords start fires and create tripping hazards ? the fewer extension cords, the better.

Extension cords must not be used as a replacement for standard electrical w iring for a building. Never use an extension cord where it is put through a hole or opening in a wall, inside a dropped ceiling or under flooring. It is against the National Electrical Code to connect extension cord wiring th rough doorways or other structural openings like windows.

For safety in workplace environments, OSHA demands that extension cords not be used for more than 90 days even as a temporary wiring solution. Daisy c hains -- multiple extension cords connected to each other and/or into a mul tiple outlet extension such as a surge protector -- are also against OSHA r egulations. Power strips that are equipped with self-contained fuses can be used as a permanent solution for extension purposes. All equipment must ha ve OSHA-certified approval.

That's absurd; makes us all criminals. Probably written by the electricians union.

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National Electric Code. This may or may not have caused the fire. It is u p to the claimant to prove that it did not cause the fire. Furthermore, it is up to the claimant to prove that there were no other such violation els ewhere.

I haven't been following along. But when the power fails, I switch off from the line, and then plug my generator into my house, and use the fuse/breaker box to run different stuff... furnace, frig, coffee maker. The frig and furnace are on different AC lines so I've gotta plug in at different points. I don't use any switches*, but I do have a double male three prong plug, that's probably illegal somewhere.

George H.

As I understand it, in order for a "generator to home wiring" setup to be legal, you need to use a real transfer switch - one which makes it physically impossible to have both the generator, and the incoming mains feed, hooked up to the house wiring simultaneously.

The way you're (apparently) doing it, it would be possible for you to accidentally try to back-power the mains... if you fail to open some of the breakers (individual-circuit or the main disconnect) or if somebody inadvertently tries to "reset a tripped breaker" under these conditions. A cross-connect of that sort could easily kill someone.

At the very least, if you're going to do this, I'd think it a good idea for you to have a "lockout padlock" that you use to close the breaker box after you open the main disconnect and the individual circuit breakers. That would, at least, prevent some "helpful" individual from reconnecting the line while the generator is powered up.

Bad experiment. The wires could have been heating the box. Probably were.

It still makes the point that it's not an issue of any concern.

NT

s the issue is that without the input relays when you plug the unit into on e outlet the path through the output relay coil can energize an exposed plu g pin. But I don't see the need for two poles. Running the 120 volt conne ction through the input relay contacts on just one side of the output relay coil will prevent the two inputs from being energized when only one is plu gged in.

ly advantage I can see is that with the two pole relays a single stuck cont act won't be dangerous. In a one pole approach it can pass a dangerous vol tage to the input plug pin. But you can hear relays working so a stuck rel ay can be detected. Also it has indicators on the inputs so you can tell t he relay isn't clicking because of a failure rather than simply no voltage. So this risk seems minimal.

ting

I guess it is a good thing that small loop antennas are very poor radiators . At 60 kHz a loop this size is a tiny fraction of a wavelength in circumf erence and so a very poor radiator. At 60 Hz the radiation is incredibly p oor. The area of this loop is *far* smaller than the loops created by the power lines running in my neighborhood much less the huge loops the main po wer lines use. I believe they are spaced so wide that you could fit my hou se between the wires. So the impact of the functionally small loop area of this device would be totally inconsequential.

Rick C.

I think you never even looked at the circuit.

Rick C.

How can you plug one extension cord into two outlets???

Rick C.

The originally posted circuit is essentially a Y extension cord into two outlets. No matter how it's wired, it's violation of the intent of the code.

At least that would require quite heavy flexible charging cord :-)

A much higher charging voltage would be desirable to keep the cable thickness reasonable.

IEC standard three phase wye/delta voltages for 50 Hz countries are

For 60 Hz countries the standard voltages are 120/208 V, 277/480 V,

Of course 1500 Vdc at 35 A would give 50 kW, so two hours would fully charge a 100 kWh battery, enough to drive hundreds of kilometers.

Then you think wrong.

How about arguing the technical issues I raised *in extreme detail over several posts* rather than just hand waving claims like that ^^^

deja vu