According to section 3003.1 of the FBC, if standby power is required or furinished to operate an elevator, it must comply with the provisions of the code. This to me means legally required.
There are several sections of the FBC which mandates standby power for elevators. When mandatred by the FBC, the system is positively to be considered a legally required system.
For example, elevators used as a component of the means of egress per Chapter 11 are required to have standby power. Elevators used in certain oocupancies identified in Chapter 4 of the FBC require standby power for elevators. Chapter 10 also has some requirements for emergency power in certain occupancies.
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Bryan P. Holland, MCP