Brain fart - cable sizing single phase and 3 phase

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Telaid

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This is sort of simple but i need another opinion. If im sizing service cables for a single phase, 200 amp 3-wire panel, 120/240 i have 100 amps on each leg max right? so I can size cable to be a 3awg? As opposed to a 200 amp 3 phase 4 wire 208y/120 panel with 200 amp on each leg. which would need 3/0 service conductors? Just a general question so im not looking at distance of run, cable type etc.

Thanks
Ron
 
Ron,
It is the same for both systems. If the breaker is a 200 amp breaker, each pole has a trip unit set at 200 amps. The conductors must be protected at or below their ampacity.
Don
 
Ron, remember that 200a @ 240v is twice as much power as 200a @ 120v.

In other words, 100a @ 240v would be no more power than 200a @ 120v would be.
 
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