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We run into this question a LOT working in older hospitals. How far "back" into the existing electrical system do I have to "fix" because of a new addition or renovation project? I always try to have a meeting with the local Authority Having Jurisdiction (usually the local electrical...

David, I hear ya! Thx.

Yes, NFPA 99 is the guideline for generators and elec systems for hospitals. Also, NEC article 517, NFPA 110 and (to a lesser extent) NFPA 101 (Life safety code). But, none of these dictate exactly how you have to size it. For example, NFPA 99, 2005 ed, chapter 4 (elec systems), 4.4.1.1.9...

To add more info. No chiller on the project. It is a NEC 517 standby generator with the 3 branches (Life Safety, Critical and Equipment). Diesel powered with 3 Automatic Transfer Switches, one for each branch. The largest load will be the DX cooling on 2 roof top units. There are 4 RTUs total...

I have a question regarding sizing a standby, diesel generator for a hospital. Typically, I total up the total KVA load connected to the generator, add 20% to the load (assuming no future capacity needed) and size the generator to the next larger KVA size. For example, if the total load on...