(B) Transfer Switches
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. [99:126.96.36.199.3.1]
- 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. [99:188.8.131.52.3.2]
Informational Note No. 1: See NFPA 99-2018, Health Care Facilities Code, 184.108.40.206.4, Automatic Transfer Switch; 220.127.116.11.5, Automatic Transfer Switch Features; 18.104.22.168.5.15, Nonautomatic Transfer Switch Features; and 22.214.171.124.7, 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).