Panel Replacement Hours

[xguard]

We have a panel to replace as a step in a larger renovation project. I'm looking for feedback of what ya'll believe a reasonable amount of time would be to replace it. It's an old 400 amp panel we can't get breakers for any more. The supply feeder, a 225 amp feeder to another panel, and a 125 amp feeder to a chiller will need to be reconnected along with 12 smaller (15 to 40 amp) circuits. I'd prefer to allow a contractor to have three days to complete the work but it will disrupt power to the whole building and we'd have to send everyone home for one day (or modify work schedules for that week). Just curious what others believe is reasonable time wise, we haven't put the project out for bid yet.

 

[Coppersmith]

Assuming you can get a new panel the same size, a lot is going to depend on the flexibility the EMT going into the top of the panel. If the EMT can be unattached and moved out of the way (by removing clamps holding it down and assuming it's sufficiently long to allow movement), it won't be too bad. I would estimate 10-12 hours for one man for replacement. An apprentice may speed this up a bit, but not a lot as they will be getting in each other's way. It would be nice to have someone to help hold up the panel while it's being fastened to the wall.

If you have to cut each of those EMT's and then extend them into the new panel, I'd say 16 hours. If the new panel is smaller, you will also have to extend each conduit. Again 16 hours.

Since a plant shutdown is required, I would plan two days. Toward the end of the first day, it will be apparent how much actual time is required. The electrician can then decide to work a longer day (either or both days) to keep up with the schedule if needed.

It would be possible I think to spend a day before the actual replacement measuring where each KO has to go and preparing the new cabinet with the appropriate holes. This would not require a shutdown and would speed up the replacement.