Emergency Disconnects

  • 19 Mar 2024 1:12 PM
    Message # 13331716

    The requirement for Emergency Disconnects in the 2023 NEC Art. 230.85 does not call out that it is to be installed on the line or load side of the utility meter.

    Also, at this time the DTE ESIG seems to be missing their requirements on this.

    Possibly DTE will be mandating an Emergency Disconnect integral with the meter enclosure. Whether underground or overhead, services could benefit from such a meter combination. 

    Additionally, 230.85 (C) Replacement. Exception. "Where only meter sockets, service entrance conductors, or related raceways and fitting are replaced, the requirements of this section shall not apply". 

    It seems since the requirement for Emergency Disconnects is paramount to safety, and the Michigan Electrical Code requires bringing up services to the present code when worked on, why this exception?

    Thoughts on this or any information about this would be helpful to contractors, installers and inspectors.

  • 20 Mar 2024 3:22 PM
    Reply # 13332360 on 13331716

    this will be a part of the update class on saturday.230.82(10) allows line side disconnects. this is used by utility companies for disconnects before meters. they are unfused and are not service rated. The neutral wire goes through the disconnect and there  are no GEC installed here. even if dte allowed the other equipment, it would not meet the requirements of part 8 230.85. each disconnect must be service rated, and within sight of the dwelling. this is a panel/ disconnect rule and applies only to panels and disconnects

  • 10 May 2024 12:55 PM
    Reply # 13355117 on 13331716

    2023 NEC Art. 230.85 (B) Disconnects 1, 2, and 3.

    There are three types of disconnects.

    1. Service Disconnects
    2. A meter disconnect integral to the meter mounting equipment not marked as suitable only for use as a service
    • Equipment installed in accordance with 230.82. (at this time none have been approved by DTE)
    1. Other listed disconnect switch or circuit breaker that is marked suitable for use as service equipment, but not
    • marked as suitable only for use as service equipment, installed on the supply side of each service disconnect.
    • Either you count the outside disconnect (that happens to also be an OCPD) and call it an
    • “Emergency Disconnect, Service Disconnect” and then bring in separate neutrals and grounding conductor
    • (just like any other “subpanel”) . 230.85 (E) (1).
    • Or you are allowed to ignore the outside disconnect (that just happens to also have an OCPD) and call it an
    • “Emergency Disconnect, Not Service Equipment” and bring in just the neutral and phase
    • conductors through into the inside panel that is the service panel and then bonding of the N/G there. 230.85 (E)(3)
    • Marked ‘Emergency Disconnect, Not Service Equipment”.
    • I don’t see where fusing is required for the feed-through disconnect switch but optional.

© Reciprocal Electrical Council Inc. 2019
Powered by Wild Apricot Membership Software