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Thread: Xfr Sw....SUSE or non-service rated

  1. #1
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    Xfr Sw....SUSE or non-service rated

    Existing 800a 208Y UG service. Utility CT cabinet and 800a MCB N3R distribution panel SUSE located on outside wall. Installation of a 100kw gen set and 800a auto xfr sw to back up service is required. AHJ (local building inspector) will allow a non-suse xfr sw fed from the CT cabinet and the load side to re-feed the 800a SUSE panel due to the location, right next to the panel.
    Question is, doesn't the xfr switch need to be SUSE listed?

  2. #2
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    Yes it does.

  3. #3
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    Thanks Bob. New to the forum, appreciate the reply. The proper application did seem obvious.

  4. #4
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    Probably so obvious that I am overlooking it... what is SUSE?

  5. #5
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    Quote Originally Posted by kwired View Post
    Probably so obvious that I am overlooking it... what is SUSE?
    SEU or USE is my guess.
    "Electricity is really just organized lightning." George Carlin


    Derék

  6. #6
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    Suitable for use as service equipment

  7. #7
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    Quote Originally Posted by GearMan View Post
    Question is, doesn't the xfr switch need to be SUSE listed?
    Quote Originally Posted by jumper View Post
    SEU or USE is my guess.
    I don't think that is it, he asked if the transfer needs to be SUSE listed. I'm thinking something along the lines of service rated transfer switch but am lost as to just exactly what SUSE would be an acronym for.

  8. #8
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    Quote Originally Posted by kwired View Post
    I don't think that is it, he asked if the transfer needs to be SUSE listed. I'm thinking something along the lines of service rated transfer switch but am lost as to just exactly what SUSE would be an acronym for.
    See post #6. The term escaped me also. The code never says "service rated".

    230.66 Marking. Service equipment rated at 600 volts or
    less shall be marked to identify it as being suitable for use
    as service equipment. Individual meter socket enclosures
    shall not be considered service equipment.

    225.36 Suitable for Service Equipment. The disconnecting
    means specified in 225.31 shall be suitable for use as
    service equipment.
    "Electricity is really just organized lightning." George Carlin


    Derék

  9. #9
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    Ok it finally penetrated my skull. I even read post 6 and it did not sink in the first time.

  10. #10
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    Actually there are several different service entrance ratings available, SUSE is just the more commonly mentioned one.

    Suitable for Use as Service Entrance (SUSE) equipment comes with a neutral to ground bonding jumper, for field installation/removal. Most panels and disconnect switches are built like this.

    Suitable for use only as service equipment comes with a neutral to ground jumper that is factory installed and not removable. All-in-one (meter+distribution), panels are built like this.

    Actually there are additional requirements that are apply to service equipment.
    Just because you can, doesn't mean you should.

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