For question dealing with 120/240V single split phase electrical circuits.

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3
votes
2answers
305 views

Explain voltage readings on NEMA 10-30 socket

The clothes dryer in the garage is plugged into what appears to be a NEMA 10-30 socket (receptacle). Reading the voltages on the socket with a multimeter, the voltage between the two diagonal ...
0
votes
1answer
64 views

Converting appliances from 120v -> 240v

I've been getting U.S. appliances sent to E.U. where the voltage is doubled. I'm using autotransformers so they can work, but this isn't ideal. I do this to save money. EU retailers add their ...
5
votes
3answers
797 views

What is the explicit difference between the ground and neutral wire in 110V systems?

So, I've put in or replaced several outlets following wiring instructions online and in the box. Nothing big. I know that if I fail to turn off the breaker then I shouldn't directly touch the black ...
4
votes
3answers
304 views

Why is it said that a typical 120V household circuit “reverses” polarity?

Responders have been very helpful with a recent post of mine. But I'm sorry to say this part still perplexes me: In a 120VAC circuit, current flows from Line 1 through the load, and returns via ...
0
votes
4answers
127 views

How to strip sheath off outdoor cable?

I am looking for a way to remove the protective sheath from a length of multicore mains electrical cable. It's rated for outdoor use and is VERY strong. Without butchering my fingers; trying to fine ...
3
votes
1answer
180 views

Can I have a 120 volt branch off a 120/240 volt circuit?

So I'm wiring up my woodshop and I've got a question about branching a 120 volt circuit off a 240 circuit. I'm running 12/3 for this circuit coming of a 20 amp 2 pole breaker. The thought for this ...
0
votes
1answer
282 views

How to Hook Up 120V & 240V On AC Disconnect?

I'm attempting to wire a RV for hooking up to 50 Amp Service. Using a AC Diconnect (60-Amp 240-Volt 240-Watt Fused )connected to a (PowerMark Gold 125-Amp 4-Space 8-Circuit Indoor Main Lug Circuit ...
1
vote
1answer
125 views

240V power plug, only getting 120v, and 97v?

This is the plug/socket: Between one line and neutral, I get 120v. Between the other line and neutral, I get nothing. However, when I go between the line and the line, I get 97 volts. (I'm testing ...
5
votes
2answers
3k views

Replacing 240V outlet with 120V

I just moved into a new home, and we have an outlet in the bathroom that was set up for a washer/dryer in case we wanted to go that route. The outlet is a NEMA 10-30R. We are happy with the dryer ...
2
votes
2answers
154 views

120 v to 12 v puck light conversion

I have 7 hardwired under cabinet puck lights which are 10 year old halogen type . All 7 or powered as 120 from one wall switch . Limited access to each light other than removing old puck and pulling ...
1
vote
1answer
1k views

Do I want a common trip or independent trip quad breaker?

I had a quad breaker that went bad. It had 30A outer pair for the dryer and 20A inner pair for my well pump. Both pairs were tied together so you could turn them on or off together - the mechanism ...
4
votes
3answers
1k views

What is wrong with this panel wiring?

I have a main breaker panel downstairs, and a subpanel upstairs. After I hired an electrician to rerun the service entry cables, nothing upstairs is right, and all the upstairs lights blew as soon as ...
1
vote
1answer
235 views

Code compliance with 120/240v outlet

I am updating the electrical in my garage. Right now, it has two GFCI 120v outlets, one on the outdoor outlets circuit and the other on the garage opener circuit. I am looking to add locking 240v ...
12
votes
7answers
82k views

Why Do 240V Circuits Not Require Neutral?

Someone told me that a 240V circuit does not require a neutral wire in the cable. Can anyone explain this phenomenon from the electricity perspective and generally explain why circuits do and do not ...
2
votes
2answers
2k views

Do 240V receptacle use the same connectors as 120V receptacles for the same amperage?

I feel like I'm missing something obvious. I know different plug styles are used based on a circuit's amperage (in the US) but is the same style of plug used for both 110V and 220V outlets of the same ...