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Interpretation #8506

Original Request

  • Requested By: Brian Coldwell
  • Requester E-Mail: bcoldwell@rcieng.com
  • Code Version: 2021
  • Code: BUILDING
  • Code Description:
  • Chapter:
  • Section: 467.8.3
  • Topic: EES (generator) type

  • Question: For a Hospice Inpatient Facility, is it the intent of FBC Building 467.8.3 to allow a generator with a single exterior transfer switch to serve the entire facility without separate distribution systems?

Answer:

As you are installing the correct type of generator, supplying the entire load and provided you are not loading the generator beyond 80% of the rating, it appears you have met the intent of the code.
On 02/23/2021 at 6:12 PM

Commentary:

NEC 700.4 allows an alternative power system to supply emergency circuits, legally required standby, and optional standby circuits where the source has adequate capacity. NFPA has regrouped type 1 and 2 emergency electrical systems now as type 1. They have reclassified type 3 as the new type 2. This all revolves around how critical the load is. The NEC does not classify generators, just the type of loads.