Natfuelbilll
Senior Member
I recall this is a no no, but what Code section prohibits this iNsAnItY ?
Three-way switching of 240V load
- Thread starter Natfuelbilll
- Start date
- Status
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
I don't know the answer, but I can't think of a reason this would be a no-no, as long as the switches are rated for that voltage. Are you talking about having a wall-mounted receptacle outlet powered by 240 volts with a 3-way arrangement for switching that outlet? Here again, so long as the receptacle is the correct type for that voltage, so that nobody tries to plug in a standard lamp, I think it should be OK.
What is the specific application you have in mind?
What is the specific application you have in mind?
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
Random thoughts:
Control only requires breaking one conductor.
You could always 3-way-switch a 2p contactor.
ultramegabob
Senior Member
- Location
- Indiana
How would that give you a three way? I agree with using a contactor.
- Location
- Massachusetts
A normal 3 way is just a SPDT, if you used a DPDT and ran three more wires you could 'three way' switch 240.
Sad to say but I shudder to think of the discombobulation that arrangement would cause with a number of our local "electricains"
hardworkingstiff
Senior Member
- Location
- Wilmington, NC
LOL, yea, get any 2 wires swapped on the terminals and it will never work (or go boom). Finding the problem would be a lot of fun.
hardworkingstiff
Senior Member
- Location
- Wilmington, NC
- Location
- Lockport, IL
- Occupation
- Retired Electrical Engineer
Can I get back to the original question, and ask why you thought this was a no-no in the first place? What is the application?
ultramegabob
Senior Member
- Location
- Indiana
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
240V 3-way
240V 3-way
Even though running a 240V lighting 3-way is irregular, making a 240V hookup would be no different than a standard 3-way wiring diagram with the exception of the opposite phase leg as a common return to each luminaire lamping rated for a 240V load. There is no grounded neutral return circuit. The travelers switch phase leg A and are isolated from the common phase leg B return in the same 14-3 cable.
240V 3-way
Oh, okay. Bob, ignore my last post, please.
Even though running a 240V lighting 3-way is irregular, making a 240V hookup would be no different than a standard 3-way wiring diagram with the exception of the opposite phase leg as a common return to each luminaire lamping rated for a 240V load. There is no grounded neutral return circuit. The travelers switch phase leg A and are isolated from the common phase leg B return in the same 14-3 cable.
14-3 no grounded return
14-3 no grounded return
Switching one phase on the travelers is proof of the pudding to isolate Phase B as the return in that circuit to the other side of the 2 pole breaker. Not practical for the lighting of modern LED low voltage lamping.
14-3 no grounded return
Switching one phase on the travelers is proof of the pudding to isolate Phase B as the return in that circuit to the other side of the 2 pole breaker. Not practical for the lighting of modern LED low voltage lamping.
240V 3-way
240V 3-way
I believe there is none as long as the component listed ratings comply. Did Charlie b ever get his question answered? (What is the application?) rbj
240V 3-way
I believe there is none as long as the component listed ratings comply. Did Charlie b ever get his question answered? (What is the application?) rbj
- Status