CRSC · California Referenced Standards Code

Protective signaling systems and detectors (Chapters 12‑72‑1, ‑2, ‑3)

Chapters 12‑72‑1, ‑2 and ‑3 set the State Fire Marshal test, performance and listing requirements for protective signaling systems, mechanically operated alarm devices, and combustion‑products smoke detectors.

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Last reviewed: July 6, 2026

Overview

This part of the California Referenced Standards Code contains the State Fire Marshal (SFM) standards that establish minimum construction, performance and test procedures for protective signaling equipment used in buildings. Chapter 12‑72‑1 sets the general scope and test-procedure framework for control units, audible devices and combination systems (see § 12‑72‑100 and § 12‑72‑101) . Those provisions tie listing and performance requirements to the California Electrical Code and recognized NFPA installation standards to ensure compatibility with building‑level alarm systems .

Chapters 12‑72‑2 and 12‑72‑3 apply the general test framework to specific device classes: mechanically operated single‑ and multiple‑station fire alarm devices (Ch. 12‑72‑2) and combustion‑products (non‑photoelectric) smoke detectors (Ch. 12‑72‑3) . Both chapters require test reports and evidence of listed components, while preserving that components already listed by an approved agency need not be retested individually but must demonstrate acceptable operation in combination and under the standard test sequences (see §§ 12‑72‑101, 12‑72‑301) . Chapter 12‑72‑3 also includes the detector test layouts and environmental/transient tests used to verify sensitivity and robustness (see detector figures and test methods) .

In this section

Code references

Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:

  • CRSC § 1009.12 High relevance — show source text

    Emergency exit and panic hardware.
    |SFM|Part 9, Section 1009.12| |Chapter 12-11A,
    12-11B|Detectable warning products and directional
    surfaces|DSA|Part 2, Sections 1112A.9, 1116A.5, 11B-247,
    11B-406.5.12, 11B-705, 11B-810.5.2| |Chapter 12-12|Reserved||| |Chapter 12-13|Standards for insulating material|CA/SFM|Part 2.5, Section R302.10.1
    Part 6, Section 110.8
    Part 9, Section 720, Table 721.1(1)
    Part 11, Section A5.504.4.8| |Chapter 12-16-1|California standard for earthquake-actuated
    automatic gas shutoff systems|DSA|Part 2, Chapters 16 and 16A
    Part 5, Section 1211.8| |Chapter 12-16-2|California standard for residential excess flow
    actuated automatic gas shutoff valves|DSA|Part 5, Section 1209.1| |Chapter 12-31C|Radiation shielding|DPH|Part 2, Section 3102C| |Chapter 12-71|Air filters|SFM|Part 4, Sections 401.2, 509.2.3, 509.2.3.4
    Part 6, Section 120.1| |Chapter 12-72-1|Protective signaling systems.
    Standard test procedures.|SFM|| |Chapter 12-72-2|Protective signaling systems. Single-and
    multiple-station fire alarm devices
    mechanically operated type.|SFM|| |Chapter 12-72-3|Protective signaling systems. Smoke detectors,
    combustion products type.|SFM||

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    12-1 ADMINISTRATION

    RESERVED

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    12-3 RELEASING SYSTEMS FOR SECURITY BARS IN DWELLINGS

    (This standard includes provisions of Underwriters Laboratories Subject 2326, Appendix B, dated December 17, 1999, reprinted with their permission.)

    INTRODUCTION

    SECTION 12-3-1—SCOPE

    12-3-1.1 These requirements cover releasing systems for bars, grilles, mesh, glazing or other items intended to provide security at doors and windows required for emergency escape from dwelling units. When actuated by the occupant, the system allows the obstructions over the door or window to be moved so occupants can escape in the event of an emergency.

  • CRSC § 12-16 High relevance — show source text

    CHAPTER 12-16-1 ENGINEERING REGULATIONS—QUALITY

    AND DESIGN OF THE MATERIALS OF

    CONSTRUCTION . . . . . . . . . . . . . . . . . . . 101

    CHAPTER 12-16-2 ENGINEERING REGULATIONS—QUALITY

    AND DESIGN OF THE MATERIALS OF

    CONSTRUCTION . . . . . . . . . . . . . . . . . . . 103

    CHAPTER 12-31C RADIATION SHIELDING STANDARDS . . 105

    CHAPTER 12-71 AIR FILTERS. . . . . . . . . . . . . . . . . . . . . . . 107

    CHAPTER 12-72-1 PROTECTIVE SIGNALING SYSTEMS . . . 109

    CHAPTER 12-72-2 PROTECTIVE SIGNALING SYSTEMS . . . 123

    CHAPTER 12-72-3 PROTECTIVE SIGNALING SYSTEMS . . . 133

    HISTORY NOTE APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

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    PART 12 CROSS REFERENCE TABLE

    (Cross reference table is nonregulatory, intended only as an aid to the code user.)

    PART 12
    STANDARD    		 SUBJECT ADOPTING
    AGENCY    		 ASSOCIATED TITLE 24
    BUILDING STANDARD
    Chapter 12-3 Releasing systems for security bars in
    dwellings    		 SFM Part 2, Sections 1031.2.1, 1031.6, 1032.7
    Part 2.5, Sections R319.1.1 and R319.4.4
    Part 9, Sections 1031.2.1, 1031.6, 1032.7
    Appendix 4 Section 452.1.5 and Title 19 provisions 4.1, 4.2, 4.3,
    4.4, 4.5, 4.6 reprinted in Part 9
    Part 10, Section 505.4
    Chapter 12-4A Laboratory animal quarters standards DPH Part 2, Section 1236
    Chapter 12-4-1 Stage and Platforms SFM Part 2, Sections 410.2.7, 410.2.7.1, 410.2.7.2
    Part 9, Sections 105.6.51, 4809
    Chapter 12-7-1 Fire-resistive standards.
  • CRSC § 12-72 High relevance — show source text

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    12-72-1 PROTECTIVE SIGNALING SYSTEMS

    STANDARD TEST PROCEDURES

    STANDARD 12-72-1

    STATE FIRE MARSHAL

    SCOPE

    Sec. 12-72-100.

    (a) Basic. This standard represents the minimum basic requirements for the construction and performance of the protective signaling systems to be listed under this classification. The minimum design, construction and performance standards set forth herein are those deemed as minimum necessary to establish conformance to the regulations of the State Fire Marshal as set forth in the California Electrical Code, and when applicable shall be reported on in their entirety by the approved testing laboratory.

    (b) Systems. This standard covers electrically operated devices and control units designed to transmit and sound alarms, supervisory and trouble signals to be employed in ordinary indoor locations in accordance with the Standards of the National Fire Protection Association for the Installation, Maintenance and Use of Proprietary, Auxiliary and Local Protective Signaling Systems, Remote Station, Nos. 72A, 72B, 72C and 72D, and the California Electrical Code. This includes combination protective signaling systems employing nonsupervised sounding circuits; combination fire alarm-communication, -program and -clock systems (hereinafter referred to as combination signaling systems); and audible devices used for both alarm and program or communication

    purposes.

    (c) Control unit. A control unit covered by this standard consists of a unit assembly of electrical parts having provisions for the connection of power-supply circuits routed through the control unit equipment by a prescribed scheme of circuitry; signal initiating circuits extended to separate devices by which the operating parts of the control unit are actuated for signals, and to incorporated or separate devices by which the signals are transmitted or indicated to form a coordinated combination system for definite signaling service.

    TEST REPORTS

    Sec. 12-72-101.

    (a) Test report contents. The report shall include engineering data, and an analysis comparing the design against Section 12-72102 (a) through (u); it shall include wiring, diagrams, operating manuals and photographs as set forth in Section 12-72-102 (a), Items 5 and 6; it shall set forth the tests performed in accordance with Sections 12-72-103 (a) through (g) and the results thereof; and shall verify the correctness of the electrical rating required by Section 12-72-107.

    (b) Listed devices. Electrical wiring, material, devices, combination of devices, fittings, appliances and equipment which have been tested and listed by an approved listing agency for the intended purpose and use need not be individually retested.

    The report shall include the catalog number or other readily identifiable marking, the name of the approved listing agency, the laboratory test report number and date. Such individually tested and listed component parts and devices when installed in combination with other devices in a control unit or in a circuit extended from such control unit shall be subjected to the performance standard tests to determine its suitability for use in combination with other component parts, devices, circuits or equipment.

  • CRSC § 12-72 High relevance — show source text

    |SFM|| |Chapter 12-72-2|Protective signaling systems. Single-and
    multiple-station fire alarm devices
    mechanically operated type.|SFM|| |Chapter 12-72-3|Protective signaling systems. Smoke detectors,
    combustion products type.|SFM||

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    12-1 ADMINISTRATION

    RESERVED

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    12-3 RELEASING SYSTEMS FOR SECURITY BARS IN DWELLINGS

    (This standard includes provisions of Underwriters Laboratories Subject 2326, Appendix B, dated December 17, 1999, reprinted with their permission.)

    INTRODUCTION

    SECTION 12-3-1—SCOPE

    12-3-1.1 These requirements cover releasing systems for bars, grilles, mesh, glazing or other items intended to provide security at doors and windows required for emergency escape from dwelling units. When actuated by the occupant, the system allows the obstructions over the door or window to be moved so occupants can escape in the event of an emergency.

    12-3-1.2 These requirements only cover the ability of the releasing system to be manually activated from the interior of a dwelling unit by an occupant to affect an escape through the protected opening.

    12-3-1.3 These requirements cover releasing systems intended for use on the interior side of doors or windows in all climatic locations.

    12-3-1.4 These requirements do not evaluate the ability of the releasing system or obstructions to resist an external forced entry attack.

    12-3-1.5 These requirements do not evaluate the ability of the releasing system or obstructions to be opened or removed from the exterior of the residential dwelling unit by emergency response personnel during rescue operations.

    12-3-1.6 Products covered by these requirements are intended for installation in dwelling units to protect door and window openings that are designated by the California Building Standards Code to be used as the secondary means of escape from the living area.

    12-3-1.7 Products covered by these requirements are not intended to be used to protect doors in means of egress path for nonresidential occupancies, the common egress path of multifamily residential dwelling units or the primary means of egress path in a single-family dwelling unit.

    12-3-1.8 These requirements do not cover window guards or fall prevention devices that are intended to prevent falls from upper story windows.

    12-3-1.9 These requirements do not apply to storm doors and windows or light duty screens used for insect control.

  • CRSC § 91.0 High relevance — show source text

    0077| |91.0|1.8687|9.0006|0.0410|0.0082| |90.5|1.9768|9.5006|0.0434|0.0087| |90.0|2.0853|10.0006|0.0458|0.0092| |89.5|2.1944|10.5007|0.0482|0.0096| |89.0|2.3039|11.0007|0.0506|0.0101| |88.5|2.4139|11.5007|0.0531|0.0106| |88.0|2.5244|12.0008|0.0555|0.0111| |87.5|2.6355|12.5008|0.0580|0.0116| |87.0|2.7470|13.0008|0.0605|0.0121| |86.5|2.8590|13.5008|0.0630|0.0126| |86.0|2.9716|14.0009|0.0655|0.0131| |85.5|3.0847|14.5009|0.0680|0.0136| |85.0|3.1984|15.0009|0.0706|0.0141| |84.5|3.3125|15.5010|0.0732|0.0146| |84.0|3.4272|16.0010|0.0757|0.0152| |83.5|3.5425|16.5010|0.0783|0.0157| |83.0|3.6583|17.0011|0.0809|0.0162| |82.5|3.7746|17.5011|0.0836|0.0167| |82.0|3.8916|18.0011|0.0862|0.0172| |81.5|4.0091|18.5011|0.0889|0.0178| |81.0|4.1271|19.0012|0.0915|0.0183| |80.5|4.2458|19.5012|0.0942|0.0188| |80.0|4.3651|20.0012|0.0969|0.0194|

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    PROTECTIVE SIGNALING SYSTEMS

    FIGURE 12-72-3-1—SMOKE DETECTOR TEST CHAMBER

    FIGURE 12-72-3-2—FIRE TEST DETECTOR INSTALLATION

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    PROTECTIVE SIGNALING SYSTEMS

    FIGURE 12-72-3-3—JARRING TEST

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    HISTORY NOTE APPENDIX

  • CRSC § 12-10 High relevance — show source text

    CHAPTER 12-10-1 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 73

    CHAPTER 12-10-2 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 77

    CHAPTER 12-10-3 EXITS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 83

    CHAPTERS 12-11A AND 12-11B

    BUILDING AND FACILITY ACCESS

    SPECIFICATIONS. . . . . . . . . . . . . . . . . . . . 85

    CHAPTER 12-12 RESERVED . . . . . . . . . . . . . . . . . . . . . . . . . 87

    CHAPTER 12-13 STANDARDS FOR INSULATING

    MATERIAL. . . . . . . . . . . . . . . . . . . . . . . . . . 89

    CHAPTER 12-16-1 ENGINEERING REGULATIONS—QUALITY

    AND DESIGN OF THE MATERIALS OF

    CONSTRUCTION . . . . . . . . . . . . . . . . . . . 101

    CHAPTER 12-16-2 ENGINEERING REGULATIONS—QUALITY

    AND DESIGN OF THE MATERIALS OF

    CONSTRUCTION . . . . . . . . . . . . . . . . . . . 103

    CHAPTER 12-31C RADIATION SHIELDING STANDARDS . . 105

    CHAPTER 12-71 AIR FILTERS. . . . . . . . . . . . . . . . . . . . . . . 107

    CHAPTER 12-72-1 PROTECTIVE SIGNALING SYSTEMS . . . 109

    CHAPTER 12-72-2 PROTECTIVE SIGNALING SYSTEMS . . . 123

    CHAPTER 12-72-3 PROTECTIVE SIGNALING SYSTEMS . . . 133

    HISTORY NOTE APPENDIX . . . . . . . . . . . . . . . . . . . . . . . . . . . 157

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    PART 12 CROSS REFERENCE TABLE

    (Cross reference table is nonregulatory, intended only as an aid to the code user.)

  • CRSC § 12-7 High relevance — show source text

    Fire tests of building
    construction and materials.|SFM|Part 2, Section 703| |Chapter 12-7-2|Reserved||| |Chapter 12-7-3|Fire-resistive standards.
    Fire testing furnaces.|SFM|Part 9, Section 3001| |Chapter 12-7-4|Fire-resistive standards.
    Fire door assembly tests.|SFM|Part 2, Section 716| |Chapter 12-7-5|Fire-resistive standards. Interior
    finish of decorative material.|SFM|Part 2, Chapter 8
    Part 9, Chapter 8| |Chapter 12-7A|Materials and construction methods for
    exterior wildfire exposure|SFM|Part 7, Chapter 5| |Chapter 12-8-1|Fire-resistive standards for fire protection|SFM|Part 2, Sections 408.14 and 435.6.2| |Appendix 12-8-1A|Calculation of the total rate of heat and carbon
    monoxide or carbon dioxide production|SFM|| |Appendix 12-8-1B|Guide to mounting techniques for wall and
    ceiling interior finish material|SFM|| |Chapter 12-10-1|Exits. Power-operated exit doors.|SFM|Part 2, Sections 408.4.2, 1010.1.4.2, 1010.1.9.1| |Chapter 12-10-2|Exits. Single-point latching or locking devices.|SFM|Part 2, Section 1010.2.2
    Part 9, Section 1010.2.2| |Chapter 12-10-3|Exits. Emergency exit and panic hardware.
    |SFM|Part 9, Section 1009.12| |Chapter 12-11A,
    12-11B|Detectable warning products and directional
    surfaces|DSA|Part 2, Sections 1112A.9, 1116A.5, 11B-247,
    11B-406.5.12, 11B-705, 11B-810.5.2| |Chapter 12-12|Reserved||| |Chapter 12-13|Standards for insulating material|CA/SFM|Part 2.5, Section R302.10.1
    Part 6, Section 110.8
    Part 9, Section 720, Table 721.1(1)
    Part 11, Section A5.504.4.8| |Chapter 12-16-1|California standard for earthquake-actuated
    automatic gas shutoff systems|DSA|Part 2, Chapters 16 and 16A
    Part 5, Section 1211.8| |Chapter 12-16-2|California standard for residential excess flow
    actuated automatic gas shutoff valves|DSA|Part 5, Section 1209.1| |Chapter 12-31C|Radiation shielding|DPH|Part 2, Section 3102C| |Chapter 12-71|Air filters|SFM|Part 4, Sections 401.2, 509.2.3, 509.2.3.4
    Part 6, Section 120.1| |Chapter 12-72-1|Protective signaling systems.
    Standard test procedures.|SFM|| |Chapter 12-72-2|Protective signaling systems.

  • CRSC § 1.5 High relevance — show source text
    1. Smoke density is measured as the drop in light intensity on a microammeter by means of photoelectric cell mounted a few inches below and about 12 inches (305 mm) inside the discharge end of the duct. The light source, stabilized for light intensity, is mounted 1 inch (25 mm) above the duct directly above the photoelectric cell. The microammeter readings are recorded every 5 seconds for the first minute and every 10 seconds for the next 2 minutes.
    2. The differences between these readings and the readings taken before the test are plotted against time (the scale being 40 μA and 40 seconds to the inch) with the resulting area under the curve being measured by use of a planimeter or calculated mathematically. This area is a measure of the smoke density produced during the test.

    (c) Classification. As a result of the tests, air filter units are classified as Class 1 or 2 as indicated below:

    1. Class 1 air filter units are those which, when clean, do not produce flames or sparks when attacked by flame and which develop areas under the smoke density curves that are less than 1.5 square inches (967 mm [2] ).
    2. Class 2 air filter units are those which, when clean, burn moderately when attacked by flame or emit moderate amounts of smoke or both. These units, although they may be consumed to some extent, do not project flames or extensive sparks that would ignite adjacent combustible materials beyond the discharge end of the duct during the test and do not develop areas under the smoke density curves that are more than 6.0 square inches (3871 mm [2] ).

    (d) Adhesive coatings. Liquid-adhesive coatings used on filters shall have a flash point of 325°F (163°C) Cleveland open cup tester, or higher.

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    12-72-1 PROTECTIVE SIGNALING SYSTEMS

    STANDARD TEST PROCEDURES

    STANDARD 12-72-1

    STATE FIRE MARSHAL

    SCOPE

    Sec. 12-72-100.

    (a) Basic. This standard represents the minimum basic requirements for the construction and performance of the protective signaling systems to be listed under this classification. The minimum design, construction and performance standards set forth herein are those deemed as minimum necessary to establish conformance to the regulations of the State Fire Marshal as set forth in the California Electrical Code, and when applicable shall be reported on in their entirety by the approved testing laboratory.

    (b) Systems. This standard covers electrically operated devices and control units designed to transmit and sound alarms, supervisory and trouble signals to be employed in ordinary indoor locations in accordance with the Standards of the National Fire Protection Association for the Installation, Maintenance and Use of Proprietary, Auxiliary and Local Protective Signaling Systems, Remote Station, Nos. 72A, 72B, 72C and 72D, and the California Electrical Code. This includes combination protective signaling systems employing nonsupervised sounding circuits; combination fire alarm-communication, -program and -clock systems (hereinafter referred to as combination signaling systems); and audible devices used for both alarm and program or communication

    purposes.

  • CRSC § 2.25 High relevance — show source text

    00|2.25|0.70|DR|3.70|1.05|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|33 mil cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|16|3.85|1.45|DR|DR|3.40|DR|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|33 mil cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|24|3.40|DR|DR|DR|2.70|DR|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#8 Screw|Steel thick-
    ness plus 3
    threads|12|3.00|1.80|DR|DR|3.00|0.65|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#8 Screw|Steel thick-
    ness plus 3
    threads|16|3.00|1.00|DR|DR|2.85|DR|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#8 Screw|Steel thick-
    ness plus 3
    threads|24|2.85|DR|DR|DR|2.20|DR|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|12|4.00|3.85|2.80|1.80|4.00|3.05|1.50|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|16|4.00|3.30|1.95|0.60|4.00|2.25|DR|DR| |Minimum 33
    mil steel
    furring or
    minimum
    1x wood
    furringc|43 mil or
    thicker cold-
    formed steel
    stud|#10 screw|Steel thick-
    ness plus 3
    threads|24|4.00|2.25|DR|DR|4.00|0.65|DR|DR| |For SI: 1 inch = 25.4 mm, 1 pound per square foot (psf) = 0.0479 kPa, 1 pound per square inch = 0.00689 MPa.
    DR = Design Required, o.c. = on center.
    a. Wood furring shall be spruce-pine-fir or any softwood species with a specific gravity of 0.42 or greater.

  • CRSC § 0.0783 High relevance — show source text

    5010|0.0783|0.0157| |83.0|3.6583|17.0011|0.0809|0.0162| |82.5|3.7746|17.5011|0.0836|0.0167| |82.0|3.8916|18.0011|0.0862|0.0172| |81.5|4.0091|18.5011|0.0889|0.0178| |81.0|4.1271|19.0012|0.0915|0.0183| |80.5|4.2458|19.5012|0.0942|0.0188| |80.0|4.3651|20.0012|0.0969|0.0194|

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    PROTECTIVE SIGNALING SYSTEMS

    FIGURE 12-72-3-1—SMOKE DETECTOR TEST CHAMBER

    FIGURE 12-72-3-2—FIRE TEST DETECTOR INSTALLATION

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    PROTECTIVE SIGNALING SYSTEMS

    FIGURE 12-72-3-3—JARRING TEST

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    HISTORY NOTE APPENDIX

    2025 California Referenced Standards Code California Code of Regulations, Title 24, Part 12

    HISTORY:

    For prior code history, see the History Note Appendix to the California Referenced Standards Code, 2022 Triennial Edition, effective January 1, 2023.

    1. Adoption of the 2025 California Referenced Standards Code, CCR Title 24, Part 12, carrying forward existing amendments from the 2022 edition. Effective on January 1, 2026.

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    on Jul 18, 2025 11:14 AM (CDT) THEREUNDER.

  • CRSC § 7.3 High relevance — show source text

    3|7.3|9.9|14.6| |26|NP|NP|NP|NP|13.2|22.4|NP|NP|5.0|8.5|11.4|16.9| |28|NP|NP|NP|NP|15.1|25.7|NP|NP|5.7|9.7|13.1|19.4| |30|NP|NP|NP|NP|17.2|NP|NP|NP|6.5|11.0|14.9|22.0| |32|NP|NP|NP|NP|19.4|NP|NP|NP|7.3|12.4|16.8|24.8| |34|NP|NP|NP|NP|21.7|NP|NP|NP|8.2|13.9|18.8|NP| |36|NP|NP|NP|NP|24.1|NP|NP|NP|9.1|15.4|20.9|NP| |For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
    NP = Not Permitted. Pressure loss exceeds reasonable limits.
    a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
    b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
    100 feet.
    c. Flow rate from Section P2904.4.2. Add 5 gpm to the flow rate required by Section_R309.3.4.2_ where the water service pipe supplies more than one dwelling.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
    NP = Not Permitted. Pressure loss exceeds reasonable limits.
    a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
    b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
    100 feet.
    c. Flow rate from Section P2904.4.2. Add 5 gpm to the flow rate required by Section_R309.3.4.2_ where the water service pipe supplies more than one dwelling.|For SI: 1 inch = 25.4 mm, 1 foot = 304.8 mm, 1 gallon per minute = 0.063 L/s, 1 pound per square inch = 6.895 kPa.
    NP = Not Permitted. Pressure loss exceeds reasonable limits.
    a. Values are applicable for underground piping materials listed in_ the California Plumbing Code_ and are based on an SDR of 11 and a Hazen Williams C Factor of 150.
    b. Values include the following length allowances for fittings: 25-percent length increase for actual lengths up to 100 feet and 15-percent length increase for actual lengths over
    100 feet.
    c. Flow rate from Section P2904.4.2.

  • California Referenced Standards Code High relevance — show source text

    |204
    |420
    |629
    |1210
    |1930
    |3410
    |6960
    | |1200
    |50
    |104
    |195
    |400
    |600
    |1160
    |1840
    |3260
    |6640
    | |1300
    |47
    |99
    |187
    |384
    |575
    |1110
    |1760
    |3120
    |6360
    | |1400
    |46
    |95
    |179
    |368
    |552
    |1060
    |1690
    |3000
    |6110
    | |1500
    |44
    |92
    |173
    |355
    |532
    |1020
    |1630
    |2890
    |5890
    | |1600
    |42
    |89
    |167
    |343
    |514
    |989
    |1580
    |2790
    |5680
    | |1700
    |41
    |86
    |162
    |332
    |497
    |957
    |1530
    |2700
    |5500
    | |1800
    |40
    |83
    |157
    |322
    |482
    |928
    |1480
    |2610
    |5330
    | |1900
    |39
    |81
    |152
    |312
    |468
    |901
    |1440
    |2540
    |5180
    | |2000|38|79|148|304|455|877|1400|2470|5040|

Frequently asked questions

Which chapter should I consult first for system-level requirements?

Start with Chapter 12‑72‑1: § 12‑72‑100 and the related test/report requirements in § 12‑72‑101 provide the overarching scope and the required contents of test reports used to list control units and systems .

Do listed components need to be fully retested when used in a control unit?

No. Components already tested and listed by an approved agency do not require individual retest, but the assembled control unit or system must be subjected to the performance tests in the applicable standard to verify compatibility and combined operation (see § 12‑72‑101 and § 12‑72‑301) .

Are photoelectric smoke detectors covered by Chapter 12‑72‑3?

No. Chapter 12‑72‑3 covers combustion‑products detectors other than the photoelectric type; photoelectric detectors are addressed under the Standard for Smoke Detectors, Photoelectric Type (UL 168) and are not covered by 12‑72‑3 .

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Related in the CRSC

Administration and scope — CRSC Chapter 12 overview

Exits and means of egress (Chapters 12‑10 series)

Building and facility access / accessibility standards (Chapters 12‑11A, 12‑11B)

Releasing systems for security bars (egress-release standards)

Standards for insulating materials (Chapter 12‑13)

Engineering regulations — quality and design of construction materials (12‑16 series)

Radiation shielding standards (Chapter 12‑31C)

Air filter standards (Chapter 12‑71)

California Referenced Standards Code