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Thread: Service Conductors in and out of building for ATS

  1. #11
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    Quote Originally Posted by jeremy.zinkofsky View Post
    Why are you not feeding the ATS from the switchboard? What is the rating of the switchboard, ATS, etc.? Does the switchboard have a main breaker?
    None of that matters because the Generator and ATS he has is feeding the Switchboard he's talking about.

    The Service Conductors coming in do not terminate on the Switchboard. They terminate on the outside ATS.
    They are using the indoor Switchboard as a raceway to get to outside ATS that's feeding that Switchboard.

    Without the ATS being Service Entrance Rated, then he technically has Service Conductors passing through his indoor Switchboard, back to the outside of the building, through the outside ATS and back into the building where they terminate on the Switchboard being used as the raceway.

    JAP>

  2. #12
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    Quote Originally Posted by jeremy.zinkofsky View Post
    Why are you not feeding the ATS from the switchboard? What is the rating of the switchboard, ATS, etc.? Does the switchboard have a main breaker?
    I don't see a way to feed the ATS from the switchboard. The switchboard is rated 1600 amps. The switchboard does not have a main breaker. It has a 1600 amp electric trip bolted pressure switch and fuses.

    The highest load recorded by the utility company was 713 amps. Based on 220.87 I got 713 amps x 1.25 = 892 amps.

    The current plan is to install a 1000 amp service rated transfer switch outside of this building. Dig up and intercept the existing conduits from the utility and extend them to the ATS. Then use the existing conduits to feed back into the building to the switchboard.

    I don't see a way to come off the load side of the fuses and disconnect in the switchboard to feed to the ATS. Maybe there is one. I don't have any drawings on the switchboard. I contacted square D and they don't have any either. It was installed in 1980 if that helps.
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  3. #13
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    Quote Originally Posted by ActionDave View Post
    Then the conductors to the transfer switch are not service conductors.
    Without any disconnect or overcurrent protection from the load side of the Utility Transformer to the line side of the Non-Service rated transfer switch on the outside of the building those conductors would still Service Conductors.

    They simply pass through the indoor Switchboard to get there.


    JAP>

  4. #14
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    Quote Originally Posted by jap View Post
    Without any disconnect or overcurrent protection from the load side of the Utility Transformer to the line side of the Non-Service rated transfer switch on the outside of the building those conductors would still Service Conductors.

    They simply pass through the indoor Switchboard to get there.


    JAP>
    I understand now. I thought there would have been a main in the switchboard and then load side wires out to the ATS.
    If you don't think too good, don't think too much.

  5. #15
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    Quote Originally Posted by ActionDave View Post
    I understand now. I thought there would have been a main in the switchboard and then load side wires out to the ATS.
    That's what the OP hoped to find also.


    JAP>

  6. #16
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    Although the use of the Main that way wouldn't work out either.


    JAP>

  7. #17
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    Quote Originally Posted by xguard View Post
    The current plan is to install a 1000 amp service rated transfer switch outside of this building. Dig up and intercept the existing conduits from the utility and extend them to the ATS. Then use the existing conduits to feed back into the building to the switchboard..
    That would be the best be.

    [/QUOTE] I don't see a way to come off the load side of the fuses and disconnect in the switchboard to feed to the ATS. Maybe there is one. I don't have any drawings on the switchboard. I contacted square D and they don't have any either. It was installed in 1980 if that helps.[/QUOTE]

    Think about how dangerous that setup would be.

    If you uncoupled the main from the buss in the Switchboard and ran load side conductors out to the ATS and back, The main would work as a disconnect for the panel when on utility power, but, would not serve to disconnect the power to the Switchboard when the X-fr Switch was on generator power.

    That's just a bad setup all the way around in my book.

    JAP>

  8. #18
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    Quote Originally Posted by jap View Post
    That would be the best be.
    I don't see a way to come off the load side of the fuses and disconnect in the switchboard to feed to the ATS. Maybe there is one. I don't have any drawings on the switchboard. I contacted square D and they don't have any either. It was installed in 1980 if that helps.[/QUOTE]

    Think about how dangerous that setup would be.

    If you uncoupled the main from the buss in the Switchboard and ran load side conductors out to the ATS and back, The main would work as a disconnect for the panel when on utility power, but, would not serve to disconnect the power to the Switchboard when the X-fr Switch was on generator power.

    That's just a bad setup all the way around in my book.

    JAP>[/QUOTE]

    Thank you for the feedback!!!

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