R331 Stationary Engine Generators — 2025 California Residential Code
California Residential Code (Title 24, Part 2.5) · 2025 edition · updated 2026-09-26 · 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 Residential Code (Title 24, Part 2.5) § R331 · Effective January 1, 2026 · Official source: Building Standards Commission
R331.1 General.¶
Stationary engine generators shall be listed and labeled in accordance with UL 2200 and shall comply with this section. The connection of stationary engine generators to the premise wiring system shall be by means of a listed transfer switch.
R331.2 Installation.¶
The installation of stationary engine generators shall be in an approved location and in accordance with the listing, the manufacturer’s installation instructions and the California Electrical Code.
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