Main's amp capacity exceeded?

[Capacitorx]

Hello,question at work I was adding some 20 amp circuits to 208 v 3 phase panel in an electric room at a hospital.it had a 30 amp main breaker at the bottom,so I was weary about adding more circuits because there were already like 8 to 10 20 a breakers in this square d panel with conductors landed on them so I was worried about exceeding breaker value and tripping it.so my question is it a nec violation to have breaker amounts and values that exceed the main breakers rating as long as the connected load does not exceed the main.the transformer feeding it was 9kva so the low voltage amp capacity was 25. I added 2 20 a boiler circiuts and a 20 amp circuit for 3 circ. Pumps..i think my forman was gambling that the other eight to 10 circuits were non-continuos loads but no one ever bothered to amp clamp anything ,so today I was told to add another 20 a circuit for a sequencer panel for the boilers I thought they must be retarded. I know my typing skills suck so please excuse me .

 

[Dennis Alwon]

As long as the load does not exceed the ampacity of the wire feeding the panel, then you can add 100-- 20 amp breakers if you want

 

[Capacitorx]

Thanks for the speedy answer

Thanks for the speedy answer

The only problem is no one investigated the actual connected loads . I was busy running 3/4 inch stick for boiler controls.so I asked my forman to check it out as he has more time on his hands.he just looked at the panel schedule which showed many of the circuits were for rooftop motors which were not carrying loads at the time .

 

[petersonra]

The only problem is no one investigated the actual connected loads . I was busy running 3/4 inch stick for boiler controls.so I asked my forman to check it out as he has more time on his hands.he just looked at the panel schedule which showed many of the circuits were for rooftop motors which were not carrying loads at the time .

Add up all the loads that can be on simultaneously and see if it exceeds what the transformer can provide.

The transformer should have OCPD that would prevent it from seeing a current that was way out of line with its rating.