What Is The Most Economical Panel Application for Client?

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electriciansnet

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A Rather large church that took over a CarMax property has now decided to use what appears to be the old CarMax auto service center (lots of bay doors) for a studio for their TV program. This building has a 600A/ 480v service. I don't have all the data yet but there appears to be room for what they want which is:
1)200A 208/1203p/4w IG panel for sound booth and equipment
1)200A 208/1203p/4w panel for lighting. The lighting they are asking for is 20a twist lock recepts. on the bar joists. 36 recepts/ 2 per circuit. 18 (1000w) circuits total. They are asking for 1-1000w dimmer per circuit and they say that they will be loaded so I'm guessing that these studio/auditorium lights are 400-450 w a piece.
They think they need 200 amp but my panel schedule software is calling for 50 because I'm pretty sure I have to rate this special lighting panel at 85%.
What is the most economical way to go with a little room to spare and keeping the xfrmr size down? Also, wouldn't single phase be a better app for this config?
They also think they need a 200 for the booth which seems excessive but I don't know the equipment. Just that they are asking for 8 quads on 8 circuits and 6 duplex/ 6 circuits on cords for under platform.

I'm trying to upload my pdf or jpeg of the riser I drew and it won't let me but I have drawn is 2-45kva xfrmrs which are fed from the 600A MDP off of 70/3 breakers. I will try to upload image.
 
electriciansnet said:
. . . wouldn't single phase be a better app for this config?
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If you have primarily 120v loads, the 3ph gives you more overall power at 200a than 1ph does.

If any line-to-line loads are rated for 208v as well as 240v, again there's no advantage to 1ph.
 
something doesnt sound right with the lighting. the fixtures used in these are typically 500w, 575w, 750w, and 1000w. The dimmers are typically a cabinet such as ETC Sensor which has a three phase supply, and branch circuits (neutral per circuit) coming out of it to the receptacles. Were you going to put 18x 1000w wall dimmer? Is this what they want? It may very well be, but again something didnt sound right.

Might also want provision for a 'company switch' which is a disco supplying a set of camlock connectors to connect portable equipment,
 
Check 2005 NEC art. 404.14 (E). General use dimmers are only allowed to be installed on permanently wired Incandescent fixtures. (If you are using standard dimmers.)
 
If this is a TV studio then they will want decent dimmers, meaning controllable from a lighting desk, and with a slow enough risetime to limit the dimmer hash getting into audio feeds...
 
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