 jack bGone FishingPremium,MVM
join:2000-09-08
Cape Cod
kudos:1 | reply to sk1939
Re: Poco infrastructure question This style meter is commonly used when supplying 2 phase service to a customer from a standard 3 phase 120/208V distribution system.
--
~Help Find a Cure for Cancer~
~Proud Member of Team Discovery ~ |
|
Reviews:
 ·RoadRunner Cable
 ·AT&T Midwest
 ·voip.ms
| said by jack b:This style meter is commonly used when supplying 2 phase service to a customer from a standard 3 phase 120/208V distribution system.
So phase-to-ground would be 120V and phase-to-phase would still be 208V, wouldn't it?
I was thinking it might be the "house" meter, for common area lighting, maybe a fire alarm system and other small loads on a minimum-cost service that would never need 208 or 240V circuits.
--
USNG:
16TDN2870
Find your USNG coordinates:
USNGWeb |
|
jack bGone FishingPremium,MVM
join:2000-09-08
Cape Cod
kudos:1 | Yup, 120 V to neutral, 208 V to phase. The meter is rated for 200 amps, the load could be anything up to that. |
|
 whizkid3Premium,MVM
join:2002-02-21
Queens, NY
kudos:9 | reply to ArgMeMatey
said by ArgMeMatey:said by jack b:This style meter is commonly used when supplying 2 phase service to a customer from a standard 3 phase 120/208V distribution system.
So phase-to-ground would be 120V and phase-to-phase would still be 208V, wouldn't it? Exactly what we have throughout NYC, and likewise throughout many other cities. Its single-phase 208/120V power, not 'two-phase'. |
|
Reviews:
·RoadRunner Cable
·AT&T Midwest
·voip.ms
| said by whizkid3: Its single-phase 208/120V power, not 'two-phase'.
Thank you. I was wondering how you'd measure 2 phases on a 120V meter. Getting confused with 240V grounded B phase. |
|
 John GaltForward, MarchPremium
join:2004-09-30
Happy Camp
kudos:5 | said by ArgMeMatey:said by whizkid3: Its single-phase 208/120V power, not 'two-phase'.
Thank you. I was wondering how you'd measure 2 phases on a 120V meter. Getting confused with 240V grounded B phase. Is that delta...??
Or are you referring to a "high leg" system? |
|
Reviews:
·RoadRunner Cable
·AT&T Midwest
·voip.ms
| said by John Galt:Is that delta...??
Or are you referring to a "high leg" system?
aka Corner-Grounded Delta. I just looked that up because I'm no expert. One transformer with three secondary taps. One tap (B) grounded. So A & C are 240V to ground.
Advantages:
- cheaper 2-pole gear can be used all down the line
- there are only three conductors just like split phase 240V
- B phase does not have to be (and CANNOT be) switched or fused.
But this is not what the OP has.
Also I ran across something on Wikipedia that mentioned that the old power station at Niagara Falls was two-phase. Maybe that was where I'd heard that before.
--
USNG:
16TDN2870
Find your USNG coordinates:
USNGWeb |
|
whizkid3Premium,MVM
join:2002-02-21
Queens, NY
kudos:9 | 4-wire, 3-phase 208/120 from a wye secondary on a transformer. Tie into any two phase conductors and the neutral, and you have single-phase 120/208. (Regardless of what they were doing in Niagara Falls ages ago.) |
|
