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Type I and II health care facilities
are required to test their EPS Systems
Under load

The testing requirements under NFPA 110, 1999 edition Chapter 6 are intended to deliver a high degree of reliability by bringing up faults before an emergency develops. This is effectively done under load.

The individual charged with operating and maintaining the EPSS should know how to perform this test by operating the test switch on the automatic transfer switch or turning off the power to the emergency circuits. He should also keep detailed records of this monthly test.

During the required 30 minute monthly exercise, the system must operate at 30% of its nameplate rating.

  1. Find the generator nameplate.
  2. Confirm the voltage used by your facility.
  3. Locate the box on the nameplate that corresponds to the phase and voltage. The amperage the generator is designed to produce will be recorded in this box.
  4. Multiply the amperes from the nameplate by .3, as in, 250 amps times .3 equals 75 amps. 75 amps will be 30% of the generator�s capability. Each leg, A, B, and C, needs to read 75 amps or more or the total divided by the number of legs needs to be 75 amps or more.
Be Careful!

Generators and automatic transfer switches as well as their appurtenant devices employ high voltages that can hurt you. Do not attempt to work with this equipment unless you are qualified. Observe all rules and cautions found in the manufacturer�s manuals as well as NFPA 70E, Standard for Electrical Safety in the Workplace.

The assistance I provide is based on the questions you ask and the accuracy of the information you provide about your equipment or project. I cannot guarantee you will like or agree with my response.

Standby Power Solutions LLC disclaims any liability for any personal injury, property, or other damages of any nature whatsoever, whether special, indirect, consequential or compensatory, directly or indirectly resulting from the publication, use of, or reliance on this document. Standby Power Solutions, LLC also makes no guaranty or warranty as to the accuracy or completeness of any information contained herein. Anyone using this document should rely on his or her own independent judgment, or as appropriate, seek the advice of a competent professional in determining the exercise of reasonable care in any given circumstances.

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