Ted M
New Member
I would like to know the maximum CB size I can use in a SubPanel.
My main panel supplies little information. Just the name, catalog number, etc., along with an area for listing what the CBs are for.
But no schematic diagram.
The main panel is a Square D Load Center; QOC40MW225, Series L7, Issue L-821.
The main disconnect CB is 200 amps, a 2QMT, 10,000 amps SYM, 240 V.
It is a 40 space panel, about 30 years old. All CBs are QO type.
I'd like to use a 100 amp QO2100 CB, two spaces, for the SubPanel.
Finding data online for such an old panel was difficult.
In one place I can find that CBs from 10 to 125 amps can be used.
In another place the higher limit is 60 amps.
However, in that instance the data was for panels made after 1996.
Any long-time electricians around that can help me here?
Why would Square D make such CBs if they could not be used?
Physically, the CB can fit. I wonder more about the stab current ratings.
Thank you very much.
Ted M
My main panel supplies little information. Just the name, catalog number, etc., along with an area for listing what the CBs are for.
But no schematic diagram.
The main panel is a Square D Load Center; QOC40MW225, Series L7, Issue L-821.
The main disconnect CB is 200 amps, a 2QMT, 10,000 amps SYM, 240 V.
It is a 40 space panel, about 30 years old. All CBs are QO type.
I'd like to use a 100 amp QO2100 CB, two spaces, for the SubPanel.
Finding data online for such an old panel was difficult.
In one place I can find that CBs from 10 to 125 amps can be used.
In another place the higher limit is 60 amps.
However, in that instance the data was for panels made after 1996.
Any long-time electricians around that can help me here?
Why would Square D make such CBs if they could not be used?
Physically, the CB can fit. I wonder more about the stab current ratings.
Thank you very much.
Ted M