Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
I'll try to explain this as clear and concise as possible. Pic shows new MDP.
1. Existing MDP being replaced with new MDP(shown) in location about 30' away in same room.
2. Existing bolted pressure switch feeding existing MDP will feed new MDP( new conduit and wire).
2. All existing loads being fed from existing MDP will be fed from new MDP. There are no new loads.
3. Some existing loads get all new conduit and wires(existing conduit/wire to be demoed). A few loads have their runs intercepted/spliced and re-routed to new MDP.
I'm trying to determine what's the best way to keep the existing loads down time as minimal as possible.
I'd imagine you would want to get in as much of the new work as possible before de-energizing existing MDP??
My thoughts on maybe how this work would go.
1. Install new MDP( existing work still in place and live).
2. Run new conduits/wires to boxes( or not) as close to loads and new MDP as possible( existing work still in place and live).
3. Now's the tough part for me to grasp. So now you have to swing over/tie in the loads. You would want the new MDP to have it's line side feed in place and terminated from existing bolted pressure switch to new MDP I would think. But that would require disconnecting power from existing bolted pressure switch to existing MDP which would take power out to all loads.
This is were I'm stuck on the best way to approach swing over with minimal downtime. They do mention using generator for existing MDP whihc would enable swinging over loads one at a time. I guess that's the best way to approach???
1. Existing MDP being replaced with new MDP(shown) in location about 30' away in same room.
2. Existing bolted pressure switch feeding existing MDP will feed new MDP( new conduit and wire).
2. All existing loads being fed from existing MDP will be fed from new MDP. There are no new loads.
3. Some existing loads get all new conduit and wires(existing conduit/wire to be demoed). A few loads have their runs intercepted/spliced and re-routed to new MDP.
I'm trying to determine what's the best way to keep the existing loads down time as minimal as possible.
I'd imagine you would want to get in as much of the new work as possible before de-energizing existing MDP??
My thoughts on maybe how this work would go.
1. Install new MDP( existing work still in place and live).
2. Run new conduits/wires to boxes( or not) as close to loads and new MDP as possible( existing work still in place and live).
3. Now's the tough part for me to grasp. So now you have to swing over/tie in the loads. You would want the new MDP to have it's line side feed in place and terminated from existing bolted pressure switch to new MDP I would think. But that would require disconnecting power from existing bolted pressure switch to existing MDP which would take power out to all loads.
This is were I'm stuck on the best way to approach swing over with minimal downtime. They do mention using generator for existing MDP whihc would enable swinging over loads one at a time. I guess that's the best way to approach???
