How Many 220/230 Breakers?

There was discussion in a thread a while back about the limit of 220/230v breakers you are allowed in panels. I didn't not realize that.
Per code, how many 220/230v 30 amp breakers am I allowed in this panel?
(I need 8 plus one 220/230 50 amp for a welder. The rest will be 110/115v 15 amp breakers)



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There might be a limit to 220/230v breakers but there is no limit to 240v 2P breakers.

Use full size breakers which means your nine 2P breaker will take up 18 spaces of 40.
I like keeping my heavy loads at the top of the panel.

 

2P breakers? You mean the double pole breakers? I'm not sure I understand "2P breakers".

If you're referring to single pole 220/230v... humm, I'm not sure I realized they come that way. Mine are all double pole. To be honest, I'm using "220/230v" as a slang term. I am assuming I have 240v breakers.

I do agree that nine 240v double pole breakers will take up 18 spaces.

I was going to put all of them in the bottom slots. I've already wired 2 of them into the bottom slots. I can still rearrange everything else & put all the rest at the top. Thanks for that tip.
But why? Just your preference or is there a technical reason?

 

2P = Two pole breakers which is the proper nomenclature. Some say "double pole breakers" but they also say 220v. There is no limit to two pole breakers in a panel.

You can't get 240 volts from a single pole breaker unless you tap off a high leg of a three-phase panel. That is also not allowed as single pole breakers are only rated 120v for 120/240 volt panels. (Note: the high leg of a three phase 120/240 volt panel is 208v to ground)

You do not have to put the largest loads to the top. The bus in the panel can carry many amps.

 

Thank you both for your input. I appreciate it.

 

There are two reasons for putting the heavier breakers at top:
1) ampacity draw on the bus.
2) heat generated.

It's not code it's just what I've done for the last 40 years.

 

Single pole "220 to 240 volt" breakers are not used in the U.S. for 240 volts because for 240 volt power both wires must be breakered. Contrasted with in countries using only 220 to 240 (or more) volts 240 volts is hot to neutral and just a single pole breaker is needed for a branch circuit.

A two pole 240 volt breaker in the U.S. may have just one toggle.