CRSC · California Referenced Standards Code
What is the scope and basic requirements for protective signaling systems?
This standard (CRSC §12-72-100) sets the minimum design, construction and performance requirements that indoor protective signaling control units and related electrically operated devices must meet to be listed — including required test reports, nameplate markings, enclosure and relay endurance tests.
Last reviewed: July 6, 2026
What the code requires — 2-4 sentences
The CRSC § 12-72-100 establishes the minimum basic requirements for the design, construction and performance of protective signaling systems (control units and electrically operated devices) to be listed under this classification. It limits coverage to devices intended for ordinary indoor locations and requires conformance with the California Electrical Code and the applicable NFPA 72 installation standards for proprietary/auxiliary/local/remote systems.
The single most important rule: this standard sets the minimum design, construction and performance requirements that a protective signaling control unit or system must meet to be listed for use in ordinary indoor locations.
Requirements in detail
Scope and covered equipment
- Basic: The standard represents the minimum basic requirements for construction and performance for protective signaling systems to be listed. § 12-72-100(a) defines this purpose.
- Systems covered: Electrically operated devices and control units designed to transmit/sound alarm, supervisory, and trouble signals for ordinary indoor locations; includes combination fire alarm–communication/program/clock systems and nonsupervised sounding circuits. See § 12-72-100(b).
- Control unit defined: A control unit is an assembly of electrical parts with power-supply connections, initiating circuits and output/indicating devices arranged to provide coordinated signaling service. § 12-72-100(c).
Test reports and listing requirements
- A test report must include engineering data, comparison to the standard checklist, wiring diagrams, operating manuals, photographs and test results (see § 12-72-101(a)). Listed components previously tested by an approved agency need not be retested individually, but must be identified in the report (catalog numbers, listing agency, test report number/date) and evaluated in combination use.
Marking, enclosure and wiring documentation
- Nameplate: Control units must be permanently marked with manufacturer, model and electrical rating. § 12-72-102(b)(1).
- Wiring diagram: A wiring diagram must be attached inside the control cabinet/enclosure. § 12-72-102(b)(2).
- Alarm silencing: If an audible-silencing switch is provided it must be marked and located inside the locked control panel; a metal sign with specific wording is required adjacent to a reset switch. See the reset/silencing marking and sign requirements.
Performance and construction minimums
- Control unit cabinets must be locked, substantial metalware designed for the service and protect against accidental contact with live parts. § 12-72-102(c).
- Relays and components used in protective signaling must meet endurance, voltage and dielectric tests and show no electrical/mechanical failures under the prescribed tests (example: 40,000 cycles endurance for relays). § 12-72-105; endurance values also in test tables.
- Electrical rating (what must be on the nameplate) includes each power-supply circuit voltage/frequency/max input and maximum current/output values for initiating and alarm circuits. § 12-72-107.
Decision-relevant dimensions / values (quick reference)
| Decision item | Typical values / requirement | Code Reference |
|---|---|---|
| Coverage (location) | Ordinary indoor locations | § 12-72-100(b) |
| System types covered | Proprietary, Auxiliary, Local, Remote; combination systems and nonsupervised circuits | § 12-72-100(b) |
| Required test report contents | Engineering data, checklist comparison, wiring diagrams, manuals, photos, test results | § 12-72-101(a) |
| Nameplate marking — power | Voltage, frequency, max input amperes/watts for each power circuit | § 12-72-107(a) |
| Mark required for actuating circuit impedance | Mark when maximum impedance is less than 100 ohms | § 12-72-102(b)(8) |
| Relay endurance | 40,000 cycles (coded/noncoded impulses) | Sec. 12-72-105(a)(5) and Table 12-72-1D |
| Minimum enclosure requirements | Locked, substantial metal cabinets; integral key locks | § 12-72-102(c)(1) |
Example — endurance test table (from the standard)
| Device/test condition | Total cycles | Cycles per minute | Code Reference |
|---|---|---|---|
| Continuous noncode signal per operation | 6,000 | 6 | Table 12-72-1D |
| Coded/noncode impulses per operation | 40,000 | 60 | Table 12-72-1D |
| Relays endurance | 40,000 | 60 | Sec. 12-72-105 & Table 12-72-1D |
Exceptions & special cases
- The standard does not cover manual stations, automatic detectors or separately listed bells/indicating devices that are not part of the control unit — these are excluded per § 12-72-101(e).
- Previously listed/approved component parts do not need full retesting but must be identified and evaluated when used in combination; the laboratory report must include listing agency and report numbers. § 12-72-101(b).
- A control unit with nonstandard construction may be investigated under the intent of the standard and may be accepted if found substantially equivalent — consult the State Fire Marshal. § 12-72-101(f).
Common mistakes
- Assuming the CRSC standard covers detectors or manual stations individually — it does not; those are excluded unless supplied as part of the control unit. § 12-72-101(e).
- Failing to attach the required wiring diagram inside the control cabinet or to mark the nameplate information (manufacturer, model, electrical ratings). § 12-72-102(b)(1–2).
- Relying on a building ground for normal operation — the standard explicitly states normal operation shall not depend upon a ground connection. § 12-72-102(c)(16).
- Omitting required signage on reset/silencing switches; the code requires a metal sign with exact wording adjacent to the reset switch. § 12-72-103(b)(9–11) (see sign requirement text).
Worked example — applying the rule with numbers
Scenario: You are submitting a new indoor proprietary control unit for listing.
- Scope check: The unit is for ordinary indoor locations and transmits alarm and trouble signals — covered by § 12-72-100(b).
- Test report: Your lab report must include engineering data, a checklist comparing the design to the standard, wiring diagrams, operating manual and photos, and test results showing compliance with the applicable subsections — per § 12-72-101(a).
- Nameplate data: If the unit has a 120 V, 60 Hz power supply with maximum input 0.8 A, and the alarm-output circuit has a maximum current of 1.5 A, those values must be marked on the nameplate under § 12-72-107(a–c).
- Actuating circuit impedance: If an initiating circuit will operate reliably only up to 80 ohms, that maximum impedance must be marked (requirement when less than 100 ohms) — § 12-72-102(b)(8).
- Relay endurance: Any relays used to switch audible signals must be shown to withstand 40,000 cycles without electrical or mechanical failure as part of the relay test data (§ 12-72-105(a)(5) and Table 12-72-1D). Provide test logs demonstrating 40,000 coded impulse cycles at rated load.
- Enclosure and marking: The control unit enclosure must be a locked, substantial metal cabinet and bear a wiring diagram inside the cabinet per § 12-72-102(c)(1) and § 12-72-102(b)(2).
If your lab report includes the above items and test evidence, it satisfies the main tests and documentation elements the State Fire Marshal expects for listing under this standard.
Related provisions
- § 12-72-100 — Scope; protective signaling systems.
- § 12-72-101 — Test reports: contents, listed devices, systems only, differing constructions.
- § 12-72-102 — General requirements: marking, enclosures, wiring diagrams.
- § 12-72-103 — (Referenced throughout the standard for tests and circuit requirements) — see the test procedures in the chapter text.
- § 12-72-104 — Printed wiring boards requirements for signaling equipment.
- § 12-72-105 — Relays for protective signaling service (voltage, endurance, dielectric).
- § 12-72-106 — Semiconductor tests and environmental performance.
- § 12-72-107 — Electrical rating (what must appear on the nameplate).
Code references
Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:
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 § 1.5 High relevance — show source text
- 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.
- 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:
- 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] ).
- 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.
2025 CALIFORNIA REFERENCED STANDARDS CODE 107
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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 § 12-72 High relevance — show source text
PROTECTIVE SIGNALING SYSTEMS
TABLE 12-72-1D—ENDURANCE TEST Col2 Col3 NORMAL SIGNALING PERFORMANCE OF DEVICE TOTAL NUMBER OF
CYCLES DEVICE TO BE
TESTEDCYCLES PER
MINUTEContinuous noncode signal for each operation of alarm signal initiating device 6,000 6 A number of coded or noncode impulses for each operation of alarm signal initiating device 40,000 60 Preliminary coded or noncode signal impulses followed by continuous signal impulses after
each operation of alarm signal initiating device40,000
resetting of device after
each group of 40 impulses—
60Relays 40,000 60 122 2025 CALIFORNIA REFERENCED STANDARDS CODE
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12-72-2 PROTECTIVE SIGNALING SYSTEMS
SINGLE- AND MULTIPLE-STATION FIRE ALARM DEVICES MECHANICALLY OPERATED TYPE
STANDARD 12-72-2
STATE FIRE MARSHAL
SCOPE
Sec. 12-72-200.
(a) Basic. This standard represents the minimum basic requirements for the construction and performance of single- and multiple-station fire alarm devices intended for indoor installation, and 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.
(b) Definitions. For the purpose of this standard, the following definitions shall apply:
Fire alarm device, multiple station. Two or more gas-operated single station units interconnected by metal tubing to one or more remote alarm-sounding devices.
Fire alarm device, single station. A self-contained fire alarm system comprising a heat detector, an alarm- sounding device and a stored energy source incorporated in one integral package. The basic types are gas- operated units and springwound units.
Gas-operated type. A device having a temperature-sensitive eutectic element; compressed gas, usually in a liquid state in a cylinder; and a sounding means, such as a horn or whistle. When the eutectic element melts, the compressed gas is released in a gaseous state through the alarm-sounding device.
Spring-wound type. A device having a temperature-sensitive bimetal or eutectic element and a spring-wound type mechanism with clapper mounted within a bell housing. The snap action of the bimetal or melting of the eutectic element releases the spring mechanism resulting in a bell-type sound.
TEST REPORTS
Sec. 12-72-201.
(a) Test Report contents. The report shall include engineering data, and an analysis comparing the design against Sections 1272-201(b) through 12-72-202(g); it shall include operating manuals and photographs. The report shall set forth the tests performed in accordance with this standard and the results thereof.
(b) Instructions and drawings. A copy of the operating and installation instructions and any related drawings is to be furnished with the sample submitted for investigation to be used as a guide in the examination and test of the unit and for this purpose they need not be in final printed form.
CRSC § 0-150 High relevance — show source text
In no case is the wire
to be smaller than No. 14 AWG.
2. At fixed parts of rigidly clamped special assemblies of live parts and insulating separators (such as contact springs on relays or cam switches) that are wired at the factory, the
spacings may be less than those indicated, but not less than1/16 inch for 0-150 volts, and not less than3/32 inch for 151-300 volts, through air and over surface, except as noted
in the following footnotes.
3. Nor less than 3/64 inch through air and over surface for 250 volts or less if the equipment which the component part controls does not consume more than 375 volt-amperes or
more than 5 amperes.
4. Not less than1/32 inch through air and over surface for a circuit involving a potential or not more than 30 volts and supplied by a primary battery or by a standard Class 2 trans-
former or by a suitable combination of transformer and fixed impedance having output characteristics in compliance with what is required for a Class 2 transformer.
5. The spacing through air at installation-wiring terminals may be less than1/4 inch but not less than 1/8 inch if the terminals are recessed in insulating material or have insulating
barriers so as to confine loose strands of conductors sufficiently to make it unlikely that the terminals will be grounded or short-circuited.|2025 CALIFORNIA REFERENCED STANDARDS CODE 121
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PROTECTIVE SIGNALING SYSTEMS
TABLE 12-72-1D—ENDURANCE TEST Col2 Col3 NORMAL SIGNALING PERFORMANCE OF DEVICE TOTAL NUMBER OF
CYCLES DEVICE TO BE
TESTEDCYCLES PER
MINUTEContinuous noncode signal for each operation of alarm signal initiating device 6,000 6 A number of coded or noncode impulses for each operation of alarm signal initiating device 40,000 60 Preliminary coded or noncode signal impulses followed by continuous signal impulses after
each operation of alarm signal initiating device40,000
resetting of device after
each group of 40 impulses—
60Relays 40,000 60 122 2025 CALIFORNIA REFERENCED STANDARDS CODE
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12-72-2 PROTECTIVE SIGNALING SYSTEMS
SINGLE- AND MULTIPLE-STATION FIRE ALARM DEVICES MECHANICALLY OPERATED TYPE
STANDARD 12-72-2
STATE FIRE MARSHAL
SCOPE
Sec. 12-72-200.
(a) Basic. This standard represents the minimum basic requirements for the construction and performance of single- and multiple-station fire alarm devices intended for indoor installation, and 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.
CRSC § 12-72 High relevance — show source text
12-72-3 PROTECTIVE SIGNALING SYSTEMS
SMOKE DETECTORS, COMBUSTION PRODUCTS TYPE
STANDARD 12-72-3
STATE FIRE MARSHAL
SCOPE
Sec. 12-72-300.
(a) Basic. This standard represents the minimum basic requirements for the construction and performance of combustion products detectors of other than the photoelectric type to be employed in ordinary indoor locations and 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.
(b) Definitions. For the purpose of this standard, the following definitions shall apply:
Alarm signal. A signal intended to indicate an emergency fire condition.
Annunciator. Integrally mounted or remotely connected visual indicating device intended to indicate an alarm or trouble condition.
Ionization type detector. A device in which the presence of small combustion practices, often invisible to the eye, interfere with the normal ionization current resulting from radiation produced by a radioactive source in the detection chamber. A second chamber, employing a similar ionization source, may also be used to compensate for normal environmental ambient changes.
Ionization-resistance bridge type detector. Employs both ionization and resistance bridge principles in one unit. Additive response from both detector elements is required for detector operation.
Resistance-bridge type detector. Responds to an abnormal rate of increase of combustion products which change the impedance of second similar plate may be employed to compensate for normal ambient changes.
Sensitivity. Relative degree of response of a detector. A high sensitivity denotes response to a lower concentration of combustion than a low sensitivity under identical fire test conditions.
Trouble signal. A visual or audible signal intended to indicate a fault or trouble condition, such as an open or ground fault, occurring in the device or connected wiring.
Voltage classification. A. Low voltage. A circuit classified as low voltage is one involving a potential of not more than 30 volts alternating current (42.4 peak) or direct current, and supplied from a circuit whose power is limited to a maximum of 100 volt
amperes. B. High voltage. A circuit classified as high voltage is one having circuit characteristics in excess of those of a low-voltage circuit.
TEST REPORTS
Sec. 12-72-301.
(a) The report shall include engineering data, and an analysis comparing the design against Sections 12-72-302 (a) through 12-72302 (t); it shall include wiring diagrams, operating manuals and photographs; it shall set forth the tests performed in accordance with this standard and the results thereof and shall verify the correctness of the electrical rating.
(b) Listed components. 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 shall be subjected to the performance standard tests to determine its suitability for use in combination with other component parts, devices, circuits or equipment.
(c) Listed detectors. Detectors which have been tested to any other acceptable test standard may be evaluated provided such test incorporates all features of this standard.
CRSC § 12-72 High relevance — show source text
TABLE 12-72-2B—TEMPERATURE CLASSIFICATIONS Col2 Col3 Col4 TEMPERATURE
** CLASSIFICATION**OPERATING TEMPERATURE LIMITS OPERATION OPERATION TEMPERATURE
** CLASSIFICATION**Minimum °F (°C) Maximum °F (°C) Tolerance, °F (°C) Ordinary 128 (53.3) 165 (73.9) 10 (5.6) Intermediate 166 (74.4) 225 (107) 15 (8.3) 2025 CALIFORNIA REFERENCED STANDARDS CODE 129
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PROTECTIVE SIGNALING SYSTEMS
FIGURE 12-72-2-1—TIME-TEMPERATURE CURVE—15-FOOT SPACINGS
FIGURE 12-72-2-2—FIRE-TEST LAYOUT
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PROTECTIVE SIGNALING SYSTEMS
FIGURE 12-72-2-3—TEST OVEN
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12-72-3 PROTECTIVE SIGNALING SYSTEMS
SMOKE DETECTORS, COMBUSTION PRODUCTS TYPE
STANDARD 12-72-3
STATE FIRE MARSHAL
SCOPE
Sec. 12-72-300.
(a) Basic. This standard represents the minimum basic requirements for the construction and performance of combustion products detectors of other than the photoelectric type to be employed in ordinary indoor locations and 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.
(b) Definitions. For the purpose of this standard, the following definitions shall apply:
Alarm signal. A signal intended to indicate an emergency fire condition.
Annunciator. Integrally mounted or remotely connected visual indicating device intended to indicate an alarm or trouble condition.
Ionization type detector. A device in which the presence of small combustion practices, often invisible to the eye, interfere with the normal ionization current resulting from radiation produced by a radioactive source in the detection chamber. A second chamber, employing a similar ionization source, may also be used to compensate for normal environmental ambient changes.
Ionization-resistance bridge type detector. Employs both ionization and resistance bridge principles in one unit. Additive response from both detector elements is required for detector operation.
Resistance-bridge type detector. Responds to an abnormal rate of increase of combustion products which change the impedance of second similar plate may be employed to compensate for normal ambient changes.
Sensitivity. Relative degree of response of a detector.
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||2025 CALIFORNIA REFERENCED STANDARDS CODE ix
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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 § 12-72 High relevance — show source text
but are to be samples that have been subjected to the complete production soldering process. The test potential is to be obtained from a suitable transformer, the output voltage of which can be regulated. The potential is to be increased gradually from zero, at the rate, of approximate 75 volts per second, until dielectric breakdown occurs. Three different locations on each sample, with different spacings between conductors, if possible, are to be tested. The locations selected are to be the same for all samples. The average dielectric breakdown potentials for each group of six samples for each location is to be determined. The average value for each location for the samples that have been conditioned is to be not less than 80 percent of the average value for the corresponding location for the samples that have not been conditioned.
RELAYS FOR PROTECTIVE SIGNALING SERVICE
Sec. 12-72-105.
(a) Test conditions. Relays which have not been qualified as approved for use with protective signaling systems by investigation and report from an approved listing agency shall have its suitability for use in a protective signaling system evidenced by an investigation and report by an approved testing laboratory which shall include certification that the relay conforms to the minimum requirements of the California Electrical Code. The test report shall include, but is not limited to:
Over- and under-voltage operation per the California Electrical Code.
The insulation of coil windings of relays shall be such as to resist the absorption of moisture.
Temperature readings on the coil and insulation under normal operation at a constant temperature (temperature may be considered constant when three succeeding readings at not less than 5 minute intervals indicate no change in temperature).
Overload test consisting of 50 operations at 115 percent of rated voltage with a test load being that which the relay is to handle.
Endurance test consisting of 40,000 cycles of coded or noncoded signal impulses at rated load and voltage.
Dielectric strength test without breakdown by application of 60 cycle a.c. at twice rated voltage plus 1,000 volts for a period not less than 1 minute.
(b) Acceptance criteria. There shall be no electrical or mechanical failure, nor any undue pitting, burning or welding of contact during any test.
SEMICONDUCTOR TESTS
Sec. 12-72-106.
(a) General. Semiconductors shall be investigated to determine their suitability for application under all the environmental conditions to which they will be exposed in service.
The performance tests of the complete device are intended to show the effects of these conditions. The prescribed tests may be supplemented where conditions exceeding those represented by the tests indicated herein may be encountered.
(b) Test procedure.
- Temperature. The system combination is to be connected as in the normal operation test and operated in an oven at 85°C. It is then to be operated in a refrigerator at 0°C. After temperature equilibrium has been maintained in both cases, the unit shall operate as in the normal operation test.
- Humidity. The system combination is to be connected as in the normal operation test, and placed in a humidity cabinet maintained at 85 percent humidity, 32°C, for a period of 48 hours. At the end of this time, the unit shall operate as in the normal operation test.
- Transient voltage. The system combination shall be subjected to the transient voltages caused by the collapse of the field of a 2-kilovolt-ampere transformer switched on and off on a random basis for 500 cycles.
- **Acceptance criteria.
CRSC § 12-72 High relevance — show source text
The testing circuit shall be protected by overcurrent devices having a rating of at least ten times the primary current rating of the transformer. Output terminals of the transformer shall be short-circuited, if such a condition results in less than three times the maximum normal load current being drawn from the secondary. Tests shall be continued until constant temperatures are attained or a burnout occurs. Blowing of the fuse on the primary side of the transformer is not considered to be a failure.
If the circuit designs of a control unit or combination signaling system incorporate a time limit cutout or a mercury tube switch wired into the system circuit in such a manner that a short circuit or a ground fault causes the device to carry current in excess of its maximum normal load, it shall withstand the test specified in Items 5 through 7, without introducing a fire hazard.
The device is to be tested in the control equipment as it is intended to be normally used and in series with a protective fuse of the marked maximum rating indicated by the markings on the control unit. All openings in the enclosure of the control equipment shall be covered with surgical cotton, and the enclosure is to be connected to ground through a fuse of the same rating as the protective fuse mentioned above.
The open circuit voltage of the test circuit is to be within 5 percent of the rated voltage; see Sections 12-72-103 (a), Item 4, and 12-72-103 (c), Item 1, of the control equipment circuit in which the device is installed, except that a higher voltage may be used if agreeable to those concerned. The source of current and the test circuit should have sufficient capacity to deliver 1,000 amperes when the system is short-circuited at the testing terminals.
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- Ignition of the cotton, or of insulation on circuit conductors, emission of flame or molten metal from the enclosure, blowing of the fuse in the grounding conductor, damage to other parts of the control equipment, or any evidence of a fire hazard is to be deemed as failure. Burnout of pigtail leads or a thermal element, or welding of contacts, is not to be considered as a failure.
PRINTED WIRING BOARDS
Sec. 12-72-104.
(a) General.
These requirements cover printed wiring boards that are intended for use in fire protective signaling equipment. The acceptability of the combination of the printed wiring board and the electric equipment is to be determined by the State Fire Marshal.
Printed wiring boards conforming to ASTM Grade FR-5 when tested in accordance with ASTM Designation D-1867, may be used in protective signaling equipment.
Throughout these requirements, the term “printed wiring” is used to designate a pattern of conductive material formed in a predetermined design on the surface or surfaces of a common insulating base, and intended primarily to provide point to point electrical connections, shielding or to form inductors. The term “printed wiring board” is used to designate the combination of a printed writing pattern and the common insulating base completely processed as far as the printed portion is concerned. The term “printed wiring assembly” is used to designate a printed wiring board on which separate components have been added.
CRSC § 12-72 High relevance — show source text
Restoration of time, recall or program circuits shall require manual operation of a resetting device in the control unit or combination signaling system console. The resetting device shall be located inside the locked control panel or console, or shall be key-operated. A metal sign having the following words shall be attached adjacent to the switch “Reset switch shall not be operated until building has been determined safe from fire.” The wiring diagram required by Section 12-72-103 (b), Item 2, shall include the circuit arrangement. 10. Combination signaling systems designed for use with a coded fire alarm control unit (control unit of type other than continuous ringing) shall be provided with an audible alarm signal relay of the lock-in type. This may be a latching-type relay or an electrical holding circuit. 11. Combination signaling systems designed for use with a continuous ringing fire alarm control unit shall be provided with a California Fire Code Signal coding device actuated by the audible alarm signal relay. 12. Combination signaling system using sound-reproducing equipment designed to provide an alarm signal of distinctive tone used for no other purpose is not required to provide a coding device. To be considered as distinctive in tone, the frequency should be not less than 300 cycles higher or lower than any other signal (such as a classroom or program signal) and shall be an undulating tone swinging not less than approximately 100 cycles each side of the mean frequency with a pulse rate of not less than 30 per minute. 13. Combination signaling systems which are so designed that they may have the power supply circuit disconnected or alarm signal output discontinued without a trouble signal shall have provisions to instantly and automatically restore power supply, signal generation and signal output upon actuation of a fire alarm initiating device.
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- The signal indicating resulting from the operation of a noncode fire alarm control unit by automatic detectors having selfrestoring contacts shall be maintained automatically by the control unit until a resetting device in the control unit is manually operated.
- Combination signaling systems designed to have the audible alarm circuit routed through a clock- cross-connect or pin board shall not, on removal or relocation of any pin, cause interruption of interference with the fire alarm signal. The circuit arrangement shall be shown on the wiring diagram required by Section 12-72-103 (b), Item 2.
- Normal operation of fire alarm signaling equipment shall not depend upon a ground connection.
- A switch and circuit provided for silencing alarm sounding devices shall conform to the following: A. Switching to the off-normal position shall automatically transfer the alarm signal to visual warning signal lights which shall not be extinguished until the system is manually restored to normal. B. With the system in normal supervisory condition, switching to the off-normal position shall result in an audible trouble signal. C. Restoration of the alarm initiating circuit to normal supervisory condition shall result in a trouble signal, unless the silencing switch and its related control circuit is of the automatically restoring type.
D. The switch shall be located inside of the locked control unit enclosure.
- Circuits and all related devices of a combination system may have their output regulated providing the minimum setting will allow satisfactory compliance to the California Electrical Code, for the total number of sound reproducers that may be served by the system.
(c) Power input-sound reproducing equipment. 1.
CRSC § 12-72 High relevance — show source text
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.
(c) Listed control units. Control units which by their design are intended to fully comply with the Standard for the Installation, Maintenance and Use of Proprietary, Auxiliary, Remote Station and Local Protective Association may be investigated and tested in accordance with the Standards for Safety established by Underwriters’ Laboratories, Inc., U.L. 864, provided such investigation, test and report incorporates the provisions of the California Electrical Code.
(d) Rejection for cause. Compliance with these standards will not necessarily mean approval and listing, if, when examined and tested, it is found to have other features which may impair the result intended by these regulations. Unusual constructions may require application of additional performance tests. The State Fire Marshal may refuse to approve any item for cause.
(e) Systems only. The standard applies to protective signaling systems as defined in the California Electrical Code, and systems or systems components for which application for approval and listing has been filed under the provisions of the California Electrical Code.
This standard does not cover manual stations, automatic detectors, automatic transmitters or other actuating devices; nor does it cover separately listed bells, registers or other indicating devices which are not provided as a part of the control unit or matched against the output of sound-reproducing equipment.
(f) Differing constructions. A control unit having materials or forms of construction differing from this standard may be investigated and tested according to the intent of this standard, and if found to be substantially equivalent may be given recognition for approval and listing. The office of the State Fire Marshal shall be consulted for general requirements and performance standards.
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GENERAL
Sec. 12-72-102.
(a) **Investigation—Report.
CRSC § 12-72 High relevance — show source text
The report of investigation shall include routing of circuits for any equipment or devices which are not necessary for the transmission of a fire alarm signal.
(b) Marking.
Control units and combination signaling systems shall be plainly and permanently marked with a nameplate bearing the manufacturer’s name, model number and electrical rating. Enclosures and castings shall have die stamped or cast identifying numbers or other readily identifiable markings. Component parts shall be fully described or identified by manufacturer’s name and model number.
A wiring diagram of the control unit or combination signaling system shall be attached inside the control cabinet or metalware enclosure.
An audible alarm silencing switch when provided, shall be marked to indicate its normal position unless it is of the automatically restoring type. A permanently attached metal or equivalent sign shall bear the following words, “Do not operate the audible alarm silencing switch until the fire department has been notified.” The trouble signal silencing switch, unless of the automatically restoring type, shall be marked to indicate its normal on position.
Terminal connections for the power supply shall be marked or identified as required by the California Electrical Code.
Installation wiring terminals or leads shall be marked or otherwise plainly evident.
A control unit designed for use with automatic detectors shall be marked for use with nonrestoring types of detectors only, unless the control unit provides signal lock-in performance required by Section 12-72-103 (b), Item 14.
A control unit designed for use with limited-energy circuits shall be marked to identify the particular circuits in which the energy is limited.
The maximum impedance of each actuating circuit shall be marked when the value for successful operation is less than 100 ohms.
A control unit designed to limit the duration of an alarm signal by means of a time-limit cutout shall be marked to indicate the time for which it is to be adjusted; nonadjustable time-limit cutouts shall be marked to indicate time at which it will operate. [See Sections 12-72-103 (l), Items 1 and 2.]
Equipment required to be mounted in a definite position in order to function properly shall be marked to indicate correct mounting position.
(c) Frame, enclosure and metalware.
- Control units and combination signaling systems shall be installed in locked substantial cabinets or metalware enclosures and shall be of a type expressly designed for the service for which they are used. Control unit cabinets and combination signaling system metalware enclosures enclosing alarm signaling circuits shall be provided with integral key locks.
- Control unit cabinets and combination signaling system metalware enclosures shall be so formed and assembled that they will have the strength and rigidity necessary to resist the abuses to which they are liable to be subjected, without adversely
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affecting their performance, and without increasing fire hazard due to total or partial collapse with resulting reduction of spacings, loosening or displacement of parts, or other serious defects. 3. Electrical parts of a control unit or combination signaling system shall be so located or enclosed that suitable protection against accidental contact with uninsulated hazardous live parts will be provided. 4. Operating parts, such as gear mechanisms, relays and similar devices, shall be protected against fouling by dust, insects or by other material which might impair their operation, by means of individual protection or dust-tight cabinets. 5.
Frequently asked questions
What does “ordinary indoor locations” mean for coverage under § 12-72-100?
It means the standard is written for equipment intended for typical indoor environments (not special outdoor or hazardous locations); the standard itself limits scope to ordinary indoor locations in § 12-72-100(b).
Are detectors covered by this standard?
No — manual stations, automatic detectors, automatic transmitters and separately listed bells/indicating devices not part of the control unit are excluded from this standard per § 12-72-101(e); they are covered by other standards.
If a component is already UL-listed, do I still need to test it?
A component listed by an approved agency need not be retested individually, but the lab report must identify it (catalog number and listing agency) and verify suitability in combination with other components in the control unit — § 12-72-101(b).
Must every initiating circuit be marked on the unit?
Yes — terminal connections and installation wiring terminals/leads must be plainly identified and certain circuit parameters (e.g., max impedance if < 100 ohms) must be marked on the control unit per § 12-72-102(b).
How many cycles must relays survive?
Relays used in protective signaling service are tested to an endurance of 40,000 cycles for coded/noncoded signals; acceptance requires no electrical or mechanical failures (§ 12-72-105 and Table 12-72-1D).
More in California Referenced Standards Code
- Administration and scope — CRSC Chapter 12 overview
- Air filter standards (Chapter 12‑71)
- Building and facility access / accessibility standards (Chapters 12‑11A, 12‑11B)
- Engineering regulations — quality and design of construction materials (12‑16 series)
- Exits and means of egress (Chapters 12‑10 series)
- Protective signaling systems and detectors (Chapters 12‑72‑1, ‑2, ‑3)
- Radiation shielding standards (Chapter 12‑31C)
- Referenced standards index / cross‑reference table (Part 12 listing of referenced standards)
- Releasing systems for security bars (egress-release standards)
- Standards for insulating materials (Chapter 12‑13)
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