Is this service 1PH or 3P - Keep getting conflicting answers

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arnagas

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Please refer to attached.

When I see this riser diagram I see a 3 Phase 1200A Meter Main.

I have someone telling me the following "[FONT=&quot]The plansindicate the main is 120/240 which is single phase. The 4 sets is the number of conduit and the (3) is the quantity of the wires."

[/FONT]I am not sure how they are going to land 4 sets of conduit on a single phase breaker. But maybe I am missing something

Who is right?
 

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arnagas said:
Please refer to attached.

When I see this riser diagram I see a 3 Phase 1200A Meter Main.

I have someone telling me the following "The plansindicate the main is 120/240 which is single phase. The 4 sets is the number of conduit and the (3) is the quantity of the wires."

I am not sure how they are going to land 4 sets of conduit on a single phase breaker. But maybe I am missing something

Who is right?
Click to expand...

Where do you see three phase? Whoever drew it up crossed a zero, which is often done to distinguish it from the letter O; is that what you are seeing as the letter phi?
 
Last edited:
Confusing
3 each 4" conduits (they only show 3 conduits, not 4)
but 4 sets x 3 conductors? (Should be 3 sets x 4 conductors?)

likely 1 ph L1, L2, N

could be ea conduit 3 ph plus N?
 
Seems very clear to me that it's 1Ø because there are 3 SEC's in each raceway. Not sure why someone would think otherwise.
 
infinity said:
Seems very clear to me that it's 1Ø because there are 3 SEC's in each raceway. Not sure why someone would think otherwise.
Click to expand...

3 conduits
12 conductors (they say 4 sets of 3, should be 3 sets of 4?)
4 conductors per conduit

if 4 conduits (they show only 3) then 4 sets x 3 makes sense
 
Ingenieur said:
3 conduits
12 conductors (they say 4 sets of 3, should be 3 sets of 4?)
4 conductors per conduit
Click to expand...

Why would there be 4 conductors/conduit if it's single phase? Unless I'm missing something I see nothing to indicate that it's 3Ø.
 
infinity said:
Correct it only shows three conduits but it clearly says 4 sets of 3-500's in each conduit.
Click to expand...

4 sets of 3 500's per conduit? 12 500's per conduit?

I read it as 4 sets of 3x500 in 3 conduits
makes no sense
3 sets of 4x500 in 3 conduit
makes sense

confusing
 
You would think the utility would want to supply this with three phase, unless the load just isn't there and/or it is in too remote location with no three phase readily available.
 
kwired said:
You would think the utility would want to supply this with three phase, unless the load just isn't there and/or it is in too remote location with no three phase readily available.
Click to expand...

I was just about to say the same thing. I don't think many utilities will provide a 1200 amp single phase service.

I'd say there is a good chance Ingenieur is right, and its a typo.
 
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