Dialysis Center - Generator

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volt102

volt102

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New Hampshire
A stand alone dialysis center was designed to provide all emergency lighting by means of battery backup unit equipment. The dialysis equipment is provided with battery backup as well. If a 150 kva generator is provided with a whole building transfer switch that supplies backup power for all loads in the building, is this a code compliant design or will the optional loads require a separate transfer switch as well as all wiring be separated?
 
volt102 said:
A stand alone dialysis center was designed to provide all emergency lighting by means of battery backup unit equipment. The dialysis equipment is provided with battery backup as well. If a 150 kva generator is provided with a whole building transfer switch that supplies backup power for all loads in the building, is this a code compliant design or will the optional loads require a separate transfer switch as well as all wiring be separated?
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I've done several of these in the past year or so. No one has required the EM circuits to be isolated in the way you describe. I can't think of any good reason for doing so.
 
If the facility meets the 3 items in the exception to 517.40(A), then all the loads on the generator should be considered optional, and a single transfer switch should suffice.

I would also have the facility managment confirm that no critical care is being preformed, and that critical power systems are not needed (other than the battery power.)

Steve
 
Hmmm... 517 specifically lists "Hemodialysis rooms or areas" under the critical branch circuits.

That might be an issue.
 
volt102 said:
Steve,

The facility is not used on a 24-hour basis. it houses up to twenty patients at a time.
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Yes, 517.33 is just for hospitals.

But NFPA 99 does have the same (or a similar list), and I don't think its list is specific to hospitals or limited care facilities. But it also says "selected receptacles". Does that mean you can select "none" for the selected receptacles to be on a generator? Maybe.

I still think one transfer switch is OK. But I would also check with the AHJ.
 
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