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  • Users: tennee2007
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  1. tennee2007

    NEC reference for bringing existing installations up to code

    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...
  2. tennee2007

    Sizing Emergency Generators for Hospitals

    David, I hear ya! Thx.
  3. tennee2007

    Sizing Emergency Generators for Hospitals

    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...
  4. tennee2007

    Sizing Emergency Generators for Hospitals

    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...
  5. tennee2007

    Sizing Emergency Generators for Hospitals

    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...

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