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Parallel outputs of AC disconnects to load-side tap

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  • Smart $
    replied
    Are there loads off the main, or is the PV system all that is connected to that main (as depicted)?

    If the latter, that could/should be considered a supply side connection under 705.12(A). As long as that single blue line immediately to the left of the main is rated for 200A (4/0@75°C is rated 230A), there should be no problem. Get both AHJ and POCO blessing before doing this.

    If there are loads off the main, it can't be done.

    Leave a comment:


  • Carultch
    replied
    Originally posted by deadshort View Post
    Is it okay to parallel the outputs of AC disconnects and run one feeder into a load-side tap?

    2 separate sub panels with identical inverter breakers (100A total each) would be fed into their own respective 100A AC discos.

    After the discos the two circuits would be combined with an insulated connector and one conductor would be tapped into a 4/0 feeder between an existing 200A main breaker and a remote load center (also protected by a 100A main).

    This idea was proposed but I've never seen it done before and it just seemed weird to me and I'm having trouble wrapping my head around it.

    Would different inverter output currents have any sort of negative effect? The current should just add right? Is this even viable/allowed by code? Can't find anything specific in 310.4 for source circuits.

    Thanks in advance.

    You cannot terminate tap conductors in to anything other than an overcurrent device or fused disconnect. In otherwords, you cannot make a tap from a tap, like you are suggesting.

    The tap rules require that you terminate in to a single OCPD or device with a single set of fuses.

    Leave a comment:


  • Parallel outputs of AC disconnects to load-side tap

    Is it okay to parallel the outputs of AC disconnects and run one feeder into a load-side tap?

    2 separate sub panels with identical inverter breakers (100A total each) would be fed into their own respective 100A AC discos.

    After the discos the two circuits would be combined with an insulated connector and one conductor would be tapped into a 4/0 feeder between an existing 200A main breaker and a remote load center (also protected by a 100A main).

    This idea was proposed but I've never seen it done before and it just seemed weird to me and I'm having trouble wrapping my head around it.

    Would different inverter output currents have any sort of negative effect? The current should just add right? Is this even viable/allowed by code? Can't find anything specific in 310.4 for source circuits.

    Thanks in advance.
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