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When wiring into your panel, If you know that you have an empty slot for a breaker, How do you know if you have room on your 100 or 200 amp service for the addition of another breaker?
 

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Each panel is rated for a certain number of circuits
A lot of 200a panels are rated for 40 or 44 (?) circuits

Usually if you have an open space you have room for another circuit
Unless you have used a lot of tandem breakers
 

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Majorty of panels will list the numbers of circuits it don't matter if you have little 6 space subpanel or monster main 42 space panel {I know canada verison can go alot more but in USA I do not know which states will allow more than 42 from single panel }

Most of 200'ers I ran into typically will come in one of three most common size .,, 20 ,30 ,40 some case 30/40 will show up the 30/40 mean 30 full sized space breakers and can allowed up to 10 tandaem breakers.

Merci,Marc

P.S.
Dave let you know per modern NEC code we are limited to 42 circuits max.
 
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