We are changing a 100 amp service to a 200 amp service with a new 200 amp breaker panel. I need to run a 2" pipe from the new panel to the existing part of the new house and take the wires from the 100 amp panel to a j-box. I will pull 20 20 amp circuts to the new j-box. How many grounds do I need to pull from the new panel to the j-box. Some of the old wiring has no ground.
New Service Addition
- Thread starter tdaug53
- Start date
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papa
Member
- Location
- South Carolina
None if raceway is emt or rigid. One if not .Also you will have to derate those 20 amp circuits by 50%.
- Location
- Massachusetts
Yes the derating will bite you in the rear, why not run a 100 amp feeder over to the old panel and just refeed it after separating the neutrals and grounds?
- Location
- Massachusetts
LarryFine
Master Electrician Electric Contractor Richmond VA
- Location
- Henrico County, VA
- Occupation
- Electrical Contractor
If I was faced with the same choices, #1 would be what Bob suggested: leave the existing panel as a sub-panel.
If I had to extend 20 20a circuits to a new panel, I'd gut the existing panel, use it as a J-box, and run 10 12/3's.
The direct answer to the original question is that the EGC need only be as large as required for the largest circuit.
If I had to extend 20 20a circuits to a new panel, I'd gut the existing panel, use it as a J-box, and run 10 12/3's.
The direct answer to the original question is that the EGC need only be as large as required for the largest circuit.
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