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Thread: Demo'ed Area Of Work

  1. #1
    Join Date
    Sep 2012

    Demo'ed Area Of Work

    Ok, need field perspective. Say you have an area of work(likeattached pic) that’s only part of an existing occupied floor that is beingdemolished for new installation work. What steps are involved in the survey,tracing and disconnecting of circuits. What happens if you have a circuit thatfeeds both the area being demolished and an existing to remain active area. I alwaysfigure having to temp out/modify the circuit to keep the unaffected area live. It’sreally the tracing out the circuits portion I’m never sure on the time ittakes. Thanks.
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  2. #2
    Join Date
    Oct 2013

    Off hours

    I did the tracing and disconnecting loads on off hours, no loss of data. Nothing worse than shutting someones computer off in the middle of a game
    A cowboy may get thrown , but they always get up and walk forward.

  3. #3
    Join Date
    Jul 2005
    I usually find out the time the GC has allocated for his demo.
    Then I figure a couple of electricians for that duration to "disconnect and make safe"
    The GC (or demo contractor) then removes everything

  4. #4
    Join Date
    Aug 2004
    Las Vegas
    It can be easy or a nightmare depending how the power was run, labeled, how many j-boxes, home run cans, circuiting, size of property, other tenants, etc..

    The challenge comes in when a lot of the electrical is hidden behind drywall, but the drywall is not being removed.

    In a perfect case there would be home run can(s) with the circuit and panels labeled. Coming off that would be drops straight down the walls. Maybe a few j-boxes labeled here and there.

    Nightmare it's run with MC cable horizontal thru walls, soffets, are other areas not set for demo work. The panels cold be anywhere in the building, not necessarily the closest. The circuits could come of multiple panels in several locations or different floors. Nothing labeled or even color correct for the voltage or circuit number. The same circuit powering different offices or even tenants is going thru demoed areas. You schedule late night work and somebody wants to stay late that night and work on their PC. Or adjacent offices work 24/7. The splices were done so poorly that something comes apart opening a box cover. Neutrals shared but not 1 splice was twisted before the nut. Something on the 277v lighting was done poorly and is ready to short and trip when the demo guys start shacking things up. Or live MC cables cut with the conductors turtled in the cable hanging in the ceiling. The trip on the substation is set to the minimum so low a 277 short could take out the entire floor, call center, IT room, fire controls, etc.. Even if a 120v circuit trips the property is so large it can take 30-60 minuets to find the breaker. Do you have your own access to the electrical rooms or do you have to find and ask for them to be open. Trying to find a few more available circuits in the existing panels. Panel schedules are outdated, such as labeled for a tenants long gone. It helps if someone knows the history of the building. They will still call something what it's former use was years later.

    Some of the problems come for re-configuring the offices in the past. The property owner changes the size of the tenants office with a few doors or small walls, such as subdividing. But it was still wired as it was 1 tenants office. Other problems with maintenance work sub standard or companies doing a little electrical work that shouldn't like the office partisan wall electrical.

    It's good to try and sort some things out before demo. Figure on 2 guys doing electrical demo, standing-by, laying out new home runes, or other work during the construction demo.

  5. #5
    Join Date
    Aug 2004
    Las Vegas
    To add another point it would be good to get a understanding of the demo schedule / number of people working for the GC tearing the place out.
    Something like that could go from 1-2 guys tearing the place up to more than 12 at the same time.
    On one end of the spectrum you may burn a lot of hours waiting for the tear out or new to be built, struggling to keep busy.
    On the other side things may come out faster than 1 or 2 JW's can keep up with.
    Especially if they have to run temp power bypassing the area to be removed.
    Or figure out where else that circuit is going if it's not straight forward.

    Depends also are you in a giant facility, tower, or basic 1 story.
    Security access can also come into play.
    Can you freely go thru a door outside.
    Or do you need to pass thru security every in and out the facility.
    Do you need to call someone to get back in the building, up the elevator, or in the office every time.
    Does security need to be scheduled to stand-by, watching while you work.

    Who is handling the fire alarm is another factor to consider.
    Will that area be put on bypass to avoid setting off from the dust or to allow the removal and rework.

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