Multiple test stations - diversity/demand?

[par38lamp]

I have a commercial customer with 36 test stations, each station will have the following quantity of receptacles:

2 - 50A, 208V, 3ph Nema 15-50R
2 - 20A, 120V, 1ph Neam 5-20R (Quad)
1 - 20A, 380V, 3ph Nema L16-20R
1 - 30A, 480V, 3ph, Nema L16-30R
1 - 30A, 208V, 1ph, Nema 10-30R

They will not be using more than one of the receptacles at a time, with the exception of the quads.

Also, it is unlikely that all the stations will be used at the same time. And if they are, very unlikely they will all be using the same voltage receptacle.

Any suggestions on diversity or demand? My service size is HUGE because I can't figure out a way to demand down these loads.

Thanks,

Par38lamp

[ July 29, 2004, 10:55 AM: Message edited by: par38lamp ]

 

[tom baker]

Re: Multiple test stations - diversity/demand?

There is precident in the NEC for non-coincident loads, examples are two motor that can't run at the same time.
However what is to say in the future the conditions won't change?
You may have to review with AHJ.

 

[tom baker]

Re: Multiple test stations - diversity/demand?

Originally posted by tom baker:
There is precident in the NEC for non-coincident loads, examples are two motor that can't run at the same time.
However what is to say in the future the conditions won't change?
You may have to review with AHJ.

The concept in a commerical building is each recpt is counted at 180 VA. Demand applies above 10,000 VA if I recall correctly.

 

[charlie b]

Re: Multiple test stations - diversity/demand?

Is there a convenient way to constrain the system, so as to prevent more than one (or two, or whatever you need) outlet from being used at the same time? Perhaps a set of manual transfer switches?