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Thread: FP&L Miami FL. Old building, main power lines are connected to a reader in a box

  1. #1
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    FP&L Miami FL. Old building, main power lines are connected to a reader in a box

    Hi, I wondering how to call this system, the 3 phase main conductors in a overhead riser are entering to an exterior junction box and connected to a device like a (KW reader) then small amount of # 10 AWG are connected to the meter box and utility meter. I need to connect a new meter to this service but have no idea how this type of system is called. Thank you !!

  2. #2
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    Thats called CT metered. Got pics? Why do you need to install new meter?

  3. #3
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    Like Chris said - it is most likley CT type metering. Common on some services between 200 and 400 amps and almost all you will ever find on services over 400 amps where entire load is metered by a single meter.

    Are you wanting to add additional service capacity, or maybe separately metered supply? More information is likely a help for us to be able to answer your questions.

  4. #4
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    Quote Originally Posted by kwired View Post
    Common on some services between 200 and 400 amps and almost all you will ever find on services over 400 amps where entire load is metered by a single meter.
    Not so much around here any more. We have been installing 600A 1Ø and 3Ø services for the last few years with no CT's.

  5. #5
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    Quote Originally Posted by chris kennedy View Post
    Not so much around here any more. We have been installing 600A 1Ø and 3Ø services for the last few years with no CT's.
    Around here POCO's don't want their guys installing or pulling meters with the kind of fault currents that will typically be available in those cases, and you don't really see too many self contained metering over 200 amps except for 320 bases at times.

    I did one a few years ago - 400 amp 277/480 service. POCO asked for a bolt in meter base. Hooked it up they put in meter - no problem. Sometime later I was working at same place and noticed they pulled all the guts out of the meter base blanked the opening for the meter and installed CT's inside the enclosure and placed CT meter off to the side of it.

    Their meter requirements that they publish indicated that they typically want CT metering for this and I was suspicious about it when they told me they wanted the bolt in meter. Someone must have made a wrong decision there.

    Another POCO that has a high number of 200 amp 277/480 services for irrigation wells in the area wants the meter and disconnect on the opposite side of pole from where the primary fuses are. That way if their linemen are installing fuses and something blows up in the meter or disconnect they are not standing directly in front of it. Same POCO does not install or remove that meter from socket without primary fuses removed from the circuit.

  6. #6
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    Cold sequence metering is gaining ground down here, it's been around quite a while up north.

  7. #7
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    Building owner need to add a meter box to his existing electrical riser, but the Old mete is a CT type metering and I just got tell from the building department (Miami City) that I cannot connect the new meter to the junction box were the CT type metering is connected,what I have to do is remove all the CT system including the old meter box and install two new meters instead. In order to do this, i will use the existing junction box to connect the 2 meters to the service main wires as the picture show. hope you understand my drawing. Attachment 0Name:  Service.jpg
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Size:  138.0 KB

  8. #8
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    Looks good as long as you have the utility and inspectors blessing, but I have a question on the voltages you have listed?

    120/240 is a 4-wire delta with a wild leg on "B" phase that will be 208 to the neutral as such the single phase meter will only be able to be connected to the A & C phases.

    If you have stated the wrong voltages and in reality you have a 120/208 Y service then you should be good to go.
    Wayne A. From: N.W.Indiana
    Be Fair, Be Safe
    Just don't be fairly safe

  9. #9
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    Thank you so much for the info.

    have a Nice weekend !!

  10. #10
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    Where are the two new main disco's going to be located?

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