517.42 Essential Electrical Systems for Nursing Homes and Limited Care Facilities
Informational Note No. 1: Type 2 essential electrical systems are comprised of two separate branches capable of supplying a limited amount of lighting and power service that is considered essential for the protection of life and safety and effective operation of the institution during the time normal electrical service is interrupted for any reason. These two separate branches are the life safety and equipment branches. [99:A.22.214.171.124.1]
Informational Note No. 2: The number of transfer switches to be used should be based upon reliability, design, and load considerations. Each branch of the essential electrical system should have one or more transfer switches. One transfer switch should be permitted to serve one or more branches in a facility with a maximum demand on the essential electrical system of 150 kVA (120 kW). [99:A.126.96.36.199.1]
Informational Note No. 3: For more information, see NFPA 99-2018, Health Care Facilities Code, 188.8.131.52.
Transfer switches shall be in accordance with one of the following:
- Each branch of the essential electrical system shall have one or more transfer switches. [99:184.108.40.206.3.1]
- One transfer switch shall be permitted to serve one or more branches or systems in a facility with a continuous load on the switch of 150 kVA (120 kW) or less. [99:220.127.116.11.3.2]
Informational Note No. 1: See NFPA 99-2018, Health Care Facilities Code, 18.104.22.168.4, Automatic Transfer Switch; 22.214.171.124.5, Automatic Transfer Switch Features; 126.96.36.199.5.15, Nonautomatic Transfer Switch Features; and 188.8.131.52.7, Nonautomatic Transfer Device Features.
Informational Note No. 2: See Informational Note Figure 517.42(a).
Informational Note No. 3: See Informational Note Figure 517.42(b).
Informational Note: If color is used to identify these receptacles, the same color should be used throughout the facility. [99:A.184.108.40.206.2]