Chapter 3 — GENERAL REGULATIONS
325.0 Alternate Source of Power for Safe Temperatures — 2025 California Mechanical Code
California Mechanical Code (Title 24, Part 4) · 2025 edition · updated 2026-10-19 · California
CBSC: official editions, supplements and errata
Italicized text is a California amendment to the model code, as printed in the official publication.
Cite as: 2025 California Mechanical Code (Title 24, Part 4) § 325.0 · Effective January 1, 2026 · Official source: Building Standards Commission
325.0 Alternate Source of Power for Safe Tempera- tures. [OSHPD 2] Mechanical equipment required to main- tain a safe temperature for residents shall be powered by an alternate source of power per California Electrical Code Sec- tion 517.1. The safe temperature shall be between 71°F to 81°F (21.6°C to 27.2°C).
FIGURE 303.10.1(1) 1, 2, 3 EXTENT OF PROTECTION NECESSARY TO REDUCE
CLEARANCES FROM GAS APPLIANCE OR VENT CONNECTORS
[NFPA 54: FIGURE 10.3.3.3(a)]
For SI units: 1 inch = 25.4 mm
FIGURE 303.10.1(3) MASONRY CLEARANCE REDUCTION SYSTEM
[NFPA 54: FIGURE 10.3.3.3(c)]
For SI units: 1 inch = 25.4 mm
Notes:
1 Masonry walls can be attached to combustible walls using wall ties.
2 Spacers shall not be used directly behind appliance or connector. FIGURE 303.10.1(2) WALL PROTECTOR CLEARANCE REDUCTION SYSTEM
[NFPA 54: FIGURE 10.3.3.3(b)]
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