shamsdebout
Senior Member
- Location
- Macon,GA
Have you come across this? Is this typical for newer homes? I haven't come across expect for a power company handbook.
120/208V Residential?
- Thread starter shamsdebout
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LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
I've only seen it in condos and apartment buildings, but only as 1ph.
Everything should work, but understand that heating will be at about 75%.
cadpoint
Senior Member
- Location
- Durham, NC
I completly agree with 208 in condo's etc. the two pole circuits that need two poles are rated for 208 service, oven, H20, A/C.
I understand the lack of effiency of 208 verses 240, I don't understand the one pole limit so much...
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
'Splain, please. One-pole limit?
cadpoint
Senior Member
- Location
- Durham, NC
lol, ok, ok, I get it ...
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
I don't. What do you mean by "one pole limit?"
shamsdebout
Senior Member
- Location
- Macon,GA
I don't either :grin:
NewOnMyOwn
Member
- Location
- NJ
Would that be considered a lack of efficiency? Or simply a lower output?
cadpoint
Senior Member
- Location
- Durham, NC
- Location
- Illinois
- Occupation
- retired electrician
It is used that way. A dwelling unit would be supplied with 3 wires...two ungrounded wires and a grounded one from the 3 phase system.Frankly, I didn't seem to understand where 208 device couldn't be used as a two pole source were required!.
This is the same layout that I've worked with when I'm around this type of service.
The Same Here
There are some areas where the utilities will supply single family dwelling units in s subdivision with single phase 120/208 service. As others have said the only issue is the wattage reduction of about 25% for heating equipment.
- Location
- Massachusetts
In Boston and Cambridge there are large residential areas served by these underground 208Y/120 networks with each dwelling only receiving two of the three phases. It seems to work well except for the fact getting a shut down is all but imposable as it will effect so many customers.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
I've seen that too in high rise apartments and condo's. Each apartment will be fed from a riser originating at a meter bank and there will be a common neutral that will be tapped to feed several apartments.
ty
Senior Member
- Location
- 3rd Rock from the Sun
almost every elec. license exam that I've taken has had a question pertaining to a 240V, 4500W electric water heater being installed on a 208V service.
- Location
- Massachusetts
In a high rise I have never seen it any other way then a 3 phase service suppling single phase units.
The areas I was talking about are typically 3.5 story brownstones or similar buildings.
The under ground network is often fed by multiple transformers located underground and spread out, the result is very high fault currents in theses homes.
ibew501ed
Senior Member
- Location
- danbury ct/work in white plains ny
The neutral current would be more than the unbalance between A and B in this case at the residential panel.
- Location
- Massachusetts
More than the imbalance but more than the current on the ungrounded conductors.
ibew501ed
Senior Member
- Location
- danbury ct/work in white plains ny
"but not more than ?
- Location
- Massachusetts
ibew501ed
Senior Member
- Location
- danbury ct/work in white plains ny
been there / done that / ALL the time
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