- Do we leave the sub panel and run home runs to each element
- Dedicated 60a service instead of sub panel?
- Should we group PA, FOH, and Stage on one larger circuit (20a, 30a?)
That is not even CLOSE to enough power to have in reserve. Admittedly that will cover most normal church productions it leaves you NO room to grow. Here are some reference points:
An Aqua2000 dry ice fogger for that special Christmas, Rapture, wedding, other big production will eat 2 20A circuits on stage.
That same production may also have a couple of full size moving lights, that's another 20A circuit or two per pair of lights.
A decent sized amp rack will need two or three legs of 20A to 30A.
Also when sizing an entertainment power system you need to plan for closer to 100% peak power use than a regular house. During the climax your going to have every light full plus sound rocking.
With out knowing the size of your venue I would want to see a MINIMUM 100A to 200A single phase service for production with plenty of spare room in the breaker panel for expansion or small cams.
As soon as you want to add the option for flying truss it goes to 200A 3 phase minimum. The chain motors will most likely need 3 phase.
Contact a few of the local production companies to come and see your space. Ask them what power they would need and expect to do a medium to large show in your space. Then at least prep for that kind of power. If they want 400A 3phase and you have no intention of ever going that big, at least get an appropriate sized conduit in place so you can pull a feed, put in a camlock disconnect and set a transformer with out breaking into cement to do it.
Edit: Forgot to add that the last theater power upgrade I was in charge of was a 600 seat high-school auditorium. We had a 400A feed to the main dimming system plus 2 circuits on stage and 2 in the booth that was shared with the "scene shop." I think we may have had a couple more available in the house. It was a nightmare. We would end up running a couple of dimmers in constant on mode to get power for any extras.
We added a 200A 3phase panel with dedicated transformer. For circuits we added:
8 20A quad boxes near stage floor.
2 L21-20 circuits (3 phase) on 6 connectors in the ceiling for chain motors and breakout stringers for LED's.
7 20A circuits spread threw out the FOH lighting positions for movers and video projectors.
4 circuits in the booth for various needs.
a few more 20A circuits in the scene shop they desperately needed.
It may sound extravagant but ALL our power problems went away! No more hum from the powered speakers on stage being on a different panel and transformer from the FOH console. No more rolling ground loop waves in the projectors because now they were all on the same power. Director wants 2 huge foggers? no problem, I made sure we had 2 locations with plenty of power up stage for foggers. Flying stuff got much more safe since we could now use chain motors for the heavy lifting.
Something else to watch for if you DO get real power is other places may "need it." I had the clout to keep them from putting a computer lab on our panel. You may not be able to keep them from using your panel to also feed the concession stand with a pile of nesco rosters eating 100A.