1. American National Standards Institute, Inc. (ANSI)

2. Institute of Electrical and Electronics Engineers (IEEE)
   a. C37.20.2 Switchgear Assemblies
   b. C57.13 Standard Requirements for Instrument Transformers.

3. U.L. Circuit Breakers and Metal-Clad Switchgear over 600 volts.

4. National Fire Protection Association (NFPA)
   a. NFPA 99 Essential Electrical Systems for Heath Care Facilities.
   b. NFPA 110 Standard for Emergency and Standby Power Systems.

5. National Electrical Manufacturers Association (NEMA)

6. State and local codes as applicable