CB sizing for subpanels

[Piramyd]

Hi There

I would need some help to size a CB for a Supanel.

What I understand is that if you have a MLO Panel Box rated 125 A you should
hook it up with a 125A feeder from a 125 A CB at the panel which feed the first one.

A question arise to me and it is if I just need to load the 125 A panel with 60A (Connected load), which would be the feeder and the CB from the first panel.

I am discussing that with other people and my opinion is that you should size (despite have a connected load of 60A ) with 125 A feeder and 125 amp CB.
Is that correct or Am I wrong ?

Thank you very much for some help.

 

[LarryFine]

You only need size the breaker and feeder to serve the intended load.

Just remember this will limit future additional loads to the sub-panel.

 

[infinity]

The minimum feeder size is determined by a load calculation. If you want the minimum you can simply use that number. Nothing says you can't use a larger feeder.

 

[Jraef]

The 125A would be the MAX size. You can use anything less than that sized for the load (or future load) as Larry Fine said.

 

[Piramyd]

Thank you very much all of you.