Additional Sub Panel
- Thread starter es1451
- Start date
- Status
kwired
Electron manager
- Location
- NE Nebraska
you could possibly add 3 or 4 more 200 amp panels.
you need to do load calculations to determine how much load the 400 amp service has on it plus what you intend to add.
you need to do load calculations to determine how much load the 400 amp service has on it plus what you intend to add.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
There is no limit to the number of sub-panels you can have. As kwired explained you only limited by the calculated load connected to the panel.
Volta
Senior Member
- Location
- Columbus, Ohio
You can add the panel with no calculations. It is the proposed load that will cause you to need the calcs.
Similarly, it only takes the simplest calculation to see that you cannot serve 120 amps from a 100 amp panel.
Also be aware that something that looks like a 400 amp service, when viewing the OCP, might truly be only a 380 amp service if run with 500 kcm.
Highly possible my brain is not working this morning, but let's back up a bit and see if I am reading correctly.
Although the header is "sub panel" it sounds more like an added service panel.
OP says he has a 400 amp service feeding a 200 and 100 amp panel...not a 400 amp panel... goes on to say in post #4 that the 200 is MLO.
Depending on the number of breakers in the 200 (a) it may be a violation or (b) it may prevent adding the 3rd panel. I think we need more detail on the 200 amp panel.
Secondly, OP states (2) 60 amp heater circuits. If these are 9.6 kw heaters we seem to be fine, but if they are greater, the 100 amp would be inadequate.
Although the header is "sub panel" it sounds more like an added service panel.
OP says he has a 400 amp service feeding a 200 and 100 amp panel...not a 400 amp panel... goes on to say in post #4 that the 200 is MLO.
Depending on the number of breakers in the 200 (a) it may be a violation or (b) it may prevent adding the 3rd panel. I think we need more detail on the 200 amp panel.
Secondly, OP states (2) 60 amp heater circuits. If these are 9.6 kw heaters we seem to be fine, but if they are greater, the 100 amp would be inadequate.
Volta
Senior Member
- Location
- Columbus, Ohio
Hmmm, good question.
- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
Can you go back to the 400 amp service panel and add another panel from there. I am having difficulties with this heat thing. If you have 2-60 amp heater kits then I believe you are going to push the capacity of any panel that is there. Sure you can add panel after panel, etc but the calculated load is more important than anything. You need to know what size load is n the panels.
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