I am looking for a section of the code that specifies when a Level I or Level II generator is required for an existing business occupancy (if there is one).
A NFPA 110 Level 1 system would be an NEC Article 700 Emergency system, basically 10 seconds or less for the restoration of power. These systems are used for life safety.
A NFPA 110 Level 2 system would be an NEC Article 701 Legally Required System, or what the ICC calls a "Standby System". These systems have up to 60 seconds to restore power. These systems are used to porvide power to equipment that assists the first responders, or provides power to industrial equipment where the loss of power can create a safety hazard.
NFPA 110 dictates how the system has to perform, the NEC has purview over the installation.
Your building could have a combination of Emergency, Legally Required, and Optional Standby systems. A single generator could supply power of everything as long as the systems had dedicated transfer equipment.
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A may be a big mistake to immediately jump to the installation standards without consulting with the occupancy codes first.
The standards referenced in the answers do not tell you when to install the generator. They just tell you how to install it.
For business occupancies of the 2018 NFPA 101, you will need to consult with the high rise building requirements before you find a code that mandates another source of power such as a generator.
Consulting with Section 220.127.116.11, existing high-rise business occupancies safety from fire must be accomplished by one of the following:
In addition Consult with NFPA 101 Section 18.104.22.168 to determine application to existing high rise buildings. Paragraph (2) applies to existing high-rise building as required by Chapter 39.
In NFPA 101 Section 11.8.5 has the mandatory requirements for Emergency and Standby Power. Section 22.214.171.124 has the mandatory requirements:
Let me know if helps or confuses you.
I recommend you get current copy of NFPA 101, Life Safety Code and review it for your application, and consult your local codes on the issue. The Life Safety Code is the most widely used source for strategies to protect people based on building construction, protection, and occupancy features that minimize the effects of fire and related hazards. Unique in the field, it is the only document that covers life safety in both new and existing structures.
NFPA 101 is available to review online for free. Link to List of NFPA Codes and Standards and click on “FREE ACCESS.”
Thank you for the response. I did refer to NFPA 101 first. The building is an existing business occupancy, not a high-rise. I didn’t see any reference to generator requirements which is why I searched several other codes including fire alarm and electric.
Thanks. Looks like your doing your due diligence and I would agree with your findings. If not found in the NFPA 101, it appears the building you are researching does not require a standby generator. I didn't really need to go further than NFPA 101 to answer your question. Please remember hierarchy of referenced documents. NFPA 72, National Fire Alarm Code and NFPA 70, National Electrical Code are subordinate to NFPA 101.
Excerpt from the attached NFPA Fact Sheet
Thank you for your help.
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