120/240 Delta 3-Phase w/208v High-Leg

[jar546]

All three-phase service meter cans for 120/240 Delta 3-Phase w/208v High-Leg require the high-leg to be on the C phase for the meter to work correctly. Electricians must know that they must switch the C-phase wire from the load side of the meter to the B phase of the service disconnect and all panelboards, switchboards, switchgear, etc., to comply with 408.3(E) of the NEC.

Do the POCOs in your area have the same setup for their meter cans? In all the counties and regions I worked in inside two different states, it's the same.

Image below courtesy of www.electricaltechnology.org

 

[Joe.B]

Where's the bonding jumper?

 

[wwhitney]

Where's the bonding jumper?

The supply is labeled as coming from a "feeder" cable, so no bonding jumper. It does have a supplementary electrode for some reason. : - )

Cheers, Wayne

 

[Joe.B]

It's labeled as "3-phase power supply" so it's not exactly clear what it's supposed to be. If it were a sub-panel supplied by a feeder, wouldn't it (the feeder) need an EGC? That's why I assumed it was a service. Oh, and Jar's OP stated "All three-phase service meter cans" so I figured we were talking about services.

 

[wwhitney]

It's labeled as "3-phase power supply" so it's not exactly clear what it's supposed to be. If it were a sub-panel supplied by a feeder, wouldn't it (the feeder) need an EGC? That's why I assumed it was a service.

Must be metallic conduit for the supply on the top.

Seriously though, it's probably meant to be a service and the MBJ was left out. I was just trying to figure out if there was a plausible alternative.

Cheers, Wayne

 

[jar546]

I wanted to post this without any type of diagram, but I tried to find something that showed the highlight going to the B phase. It’s not about the diagram that I posted, it’s about the information that I provided. I’m trying to have a conversation specific to where utility companies land the high leg on their meters.

 

[Joe.B]

I've never seen one.

 

[jar546]

I've never seen one.

Diagram or Meter can for 208 delta?

 

[Joe.B]

Diagram or Meter can for 208 delta?

Hahaha yeah, I've never seen a diagram before.

 

[Norcal]

Diagram or Meter can for 208 delta?

There is no 208 delta.

 

[ICE]

I’m trying to have a conversation specific to where utility companies land the high leg on their meters

Have you tried talking to yourself?

 

[jar546]

There is no 208 delta.

Do you want me to describe it as a 120/240 delta with a 208 high-leg? Would that make you feel better?
In the different areas I've worked in, it's been called different things by electricians, but we all know what we mean.

Actually, look at what I titled this thread. Once what we are talking about is established, common lingo should be able to be applied.

 

[Norcal]

Do you want me to describe it as a 120/240 delta with a 208 high-leg? Would that make you feel better?
In the different areas I've worked in, it's been called different things by electricians, but we all know what we mean.

Actually, look at what I titled this thread. Once what we are talking about is established, common lingo should be able to be applied.

The phase to phase voltage is 240V, and the high leg is unusable by it's self. 240/120V does not always need to mention the high leg, just need to know the difference between it & 208Y/120V. 120/240V is single phase, 240/120V is 3Ø.

 

[jar546]

The phase to phase voltage is 240V, and the high leg is unusable by it's self. 240/120V does not always need to mention the high leg, just need to know the difference between it & 208Y/120V. 120/240V is single phase, 240/120V is 3Ø.

You are 100% correct, and I have no argument with your statement, other than 208/120 Wye is also 3ph.

However.

Many of the people who are on this forum may only inspect residential and have limited to no experience with 240/120 3ph, so I personally find it better to be explanatory about it so they know that we are not talking about 120/240. Some might think that there is no difference between 120/240 and 240/120, or even know what a delta transformer is. There is a greater good that I am trying to communicate on this forum, and it stretches farther than being technically accurate with what voltage we are talking about. Not everyone is you and operates at your level.