Commercial Building Inspector B2Public Safety and Special ConstructionHard
A developer is constructing a new high-rise building with a floor area of 30,000 square feet per story. The building is designed with a smoke control system. Which of the following is an acceptable method for providing the required standby power for the smoke control system, according to IBC 909.11?
- AAn emergency power system in accordance with NFPA 110, Level 1.
- BSeparate connections to two distinct utility power grids, with automatic transfer.
- CA single generator located in the basement, providing power only to the smoke control system.
- DA legally required standby power system in accordance with NFPA 110, Level 2.
Show answer & explanationAnswer & explanation
Correct answer: A. An emergency power system in accordance with NFPA 110, Level 1.
IBC 909.11.1 requires standby power for smoke control systems to be provided by an emergency power system in accordance with Section 2702.2.1, which references NFPA 110, Level 1. This ensures the highest level of reliability and rapid power transfer.
Why the other options are wrong
- B. While redundant utility feeds can provide some reliability, they are generally not considered equivalent to a dedicated emergency power system (generator) for critical life safety functions like smoke control, which requires a guaranteed, isolated power source.
- C. While a generator is a standby power source, 'only to the smoke control system' and 'single generator' doesn't guarantee compliance with the broader NFPA 110 Level 1 requirements for reliability and testing.
- D. NFPA 110, Level 2, is for legally required standby systems, which have less stringent requirements than emergency power systems (Level 1) and are not sufficient for smoke control.
Smoke Control System Standby Power
Standby power for smoke control systems must be provided by an emergency power system compliant with NFPA 110, Level 1, to ensure immediate and reliable operation during a power outage.
- Required for all smoke control systems.
- Must meet NFPA 110, Level 1 standards.
- Ensures power within 10 seconds of primary power failure.
- Includes fuel supply, testing, and maintenance protocols.
Memory trick: Smoke's Power: Level 1, no question, to prevent suffocation.