The maximum discharge time permitted for halocarbon clean agent systems is

According to NFPA 2001, Standard on Clean Agent Fire Extinguishing Systems, the discharge time for halocarbon agents shall not exceed 10 seconds. This rapid discharge is critical for achieving the minimum design concentration required for extinguishment before the fire can cause significant damage or become too large to control. The standard specifies that this time is measured until the agent concentration reaches 95 percent of the minimum design concentration at the highest point of the hazard. This requirement ensures the swift and effective suppression of fires in the protected space.

B. 30 seconds: This value is incorrect and does not correspond to the discharge time requirements for any type of clean agent system under NFPA 2001.

C. 45 seconds: This is an arbitrary time frame with no basis in the NFPA 2001 standard for clean agent discharge.

D. 60 seconds: This is the maximum discharge time permitted for inert gas clean agent systems, not for halocarbon systems.

1. NFPA 2001, Standard on Clean Agent Fire Extinguishing Systems, 2022 Edition. Section 5.7.1, "The discharge time for halocarbon agents shall not exceed 10 seconds."

2. SFPE Handbook of Fire Protection Engineering, 5th Edition. Chapter 57, "Clean Agent Total Flooding Systems," Section 57.4.3, "Discharge Time," Table 57.3. This section confirms that for halocarbon agents, the maximum discharge time is 10 seconds for Class A, B, and C hazards. (DOI: https://doi.org/10.1007/978-1-4939-2562-457)