CRSC · California Referenced Standards Code
Therapeutic X‑ray, megavoltage and accelerator shielding
This hub explains where the CRSC requires NCRP shielding reports and how the California Building Code Chapter 31C implements shielding, interlock and control‑station requirements.
Last reviewed: July 6, 2026
Overview
This part of the California Referenced Standards Code (CRSC) collects the mandatory shielding standards and referenced reports used to design radiation barriers for therapeutic X‑ray, megavoltage and particle‑accelerator facilities. The CRSC points to NRCP/NCRP reports — notably Report No. 49 (structural shielding for medical X‑ and gamma‑rays), Report No. 51 (particle accelerator shielding), and Report No. 35 (dental X‑ray protection) — as the required basis for barrier design and evaluation under Sec. § 12‑31C‑101.
These referenced standards are applied through the California Building Code Chapter 31C (Radiation), which sets scope and procedural requirements for radiation shielding barriers (§ 3101C and § 3102C) and specific equipment rules for medical therapeutic X‑ray installations (§ 3104C). Together these provisions require primary and secondary protective barriers, minimum borders for beam‑strike areas, viewing‑window attenuation, interlocks and other safety features for equipment above defined kVp thresholds.
At a practical level, designers and AHJs should use § 12‑31C‑101 as the technical reference for shielding calculations and follow the California Building Code provisions for room configuration, control‑station shielding and operational safeguards (for example, control‑station/window requirements and interlocks for machines above 150 kVp). Compliance questions and variance requests are handled by the Department of Public Health as noted in the code cross‑references.
In this section
Code references
Grounded in the retrieved California Referenced Standards Code — click a citation to read the verbatim passage:
CRSC § 3103C.1 High relevance — show source text
SECTION 3103C—MEDICAL RADIOGRAPHIC AND PHOTOFLUOROGRAPHIC INSTALLATIONS
3103C.1 Operator station. The operator’s station at the control shall be behind a protective barrier either in a separate room, in a protected booth or behind a shield which will intercept the useful beam and any radiation which has been scattered only once.
3103C.2 Patient observation and communication. Provision shall be made for the operator to observe and communicate with the patient without leaving the shielded position at the control panel. When an observation window is used, it must provide radiation atten- uation equal to that required in the surrounding barrier.
SECTION 3104C—MEDICAL THERAPEUTIC X-RAY INSTALLATIONS
3104C.1 General. All wall, floor and ceiling areas that can be struck by the useful beam, plus a border of 1 foot (305 mm), shall be provided with primary protective barriers.
3104C.2 Equipment operating above 50 kVp. Equipment operating above 50 kVp shall conform with the following: 1. The control station shielding shall either be an integral part of the building or anchored to the building. 2. The control station shall be provided with a window having radiation attenuation equal to that required by the adjacent barrier, or a mirror system, or a closed-circuit television viewing screen. The patient area must be visible to the operator with- out having to leave the protected area during exposure.
3104C.3 Equipment operating above 150 kVp. Equipment operating above 150 kVp shall conform to the following: 1. The treatment room shall be provided with interlocks so that when any door of the treatment room is opened, either the machine will shut off automatically or the radiation level within the room will be reduced to an average of not more than 2 milliroentgens per hour and a maximum of 10 milliroentgens per hour at a distance of one meter in any direction from the target. After such shutoff or reduction in output, it shall be possible to restore the machine to full operation only from the control panel. 2. The control station shall be within a protective booth or in an adjacent room.
3104C.4 A minimum of one door shall be provided with an auxiliary means for being opened in case of power failure or mechanical breakdown, where large power-driven doors offer the only access to the room.
3104C.5 A flashing red warning signal light energized only when the useful beam is on shall be located adjacent to the entrance(s) to a therapy room with equipment capable of operating above 500 kVp.
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CALIFORNIA BUILDING CODE – MATRIX ADOPTION TABLE
CHAPTER 31D – FOOD ESTABLISHMENTS
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
CRSC § 31B-22 Medium relevance — show source text
3162B Anti-Entrapment Devices and Systems . . . . . . . . . . 31B-22
CHAPTER 31C RADIATION . . . . . . . . . . . . . . . . . . . . . . . . . .31C-1
3101C Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31C-3
3102C Radiation Shielding Barriers . . . . . . . . . . . . . . . . . . . . . 31C-3
3103C Medical Radiographic and Photofluorographic Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31C-3
3104C Medical Therapeutic X-Ray Installations. . . . . . . . . . 31C-3
CHAPTER 31D FOOD ESTABLISHMENTS. . . . . . . . . . . . . . .31D-1
3101D Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31D-3
3102D Definition . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31D-3
3103D Buildings and Structures. . . . . . . . . . . . . . . . . . . . . . . . . 31D-3
CHAPTER 31E RESERVED. . . . . . . . . . . . . . . . . . . . . . . . . . .31E-1
CHAPTER 31F MARINE OIL TERMINALS . . . . . . . . . . . . . . .31F-1
3101F Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31F-3
3102F Audit and Inspection. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31F-6
3103F Structural Loading Criteria . . . . . . . . . . . . . . . . . . . . . 31F-19
3104F Seismic Analysis and Structural Performance. . . . 31F-34
3105F Mooring and Berthing Analysis and Design . . . . . . 31F-48
3106F Geotechnical Hazards and Foundations . . . . . . . . . 31F-55
CRSC § 1.11. Medium relevance — show source text
The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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31C [DPH] RADIATION
SECTION 3101C—SCOPE
For the purpose of this chapter, the following terms shall have the meaning indicated:
PRIMARY PROTECTIVE BARRIER is a barrier to attenuate the useful beam.
SECONDARY PROTECTIVE BARRIER is a barrier to attenuate stray radiation.
STRAY RADIATION is radiation not serving any useful purpose, which includes leakage and scattered radiation.
USEFUL BEAM is the radiation which passes through the window, aperture, cone or other collimating device of the tube housing.
SECTION 3102C—RADIATION SHIELDING BARRIERS
All radiation shielding barriers in rooms and enclosures housing machines shall meet the requirements of Section 12-31C-101, Chapter 12-31C, Part 12, California Referenced Standards Code. The Department of Health Services is the only agency that may grant a variance or exception to these standards.
SECTION 3103C—MEDICAL RADIOGRAPHIC AND PHOTOFLUOROGRAPHIC INSTALLATIONS
3103C.1 Operator station. The operator’s station at the control shall be behind a protective barrier either in a separate room, in a protected booth or behind a shield which will intercept the useful beam and any radiation which has been scattered only once.
3103C.2 Patient observation and communication. Provision shall be made for the operator to observe and communicate with the patient without leaving the shielded position at the control panel. When an observation window is used, it must provide radiation atten- uation equal to that required in the surrounding barrier.
SECTION 3104C—MEDICAL THERAPEUTIC X-RAY INSTALLATIONS
3104C.1 General. All wall, floor and ceiling areas that can be struck by the useful beam, plus a border of 1 foot (305 mm), shall be provided with primary protective barriers.
3104C.2 Equipment operating above 50 kVp. Equipment operating above 50 kVp shall conform with the following: 1. The control station shielding shall either be an integral part of the building or anchored to the building. 2. The control station shall be provided with a window having radiation attenuation equal to that required by the adjacent barrier, or a mirror system, or a closed-circuit television viewing screen. The patient area must be visible to the operator with- out having to leave the protected area during exposure.
CRSC § 1.11. Medium relevance — show source text
CALIFORNIA BUILDING CODE – MATRIX ADOPTION TABLE
CHAPTER 31C – RADIATION
(Matrix Adoption Tables are nonregulatory, intended only as an aid to the code user. See Chapter 1 for state agency authority and building applications.)
Adopting agency BSC BSC-
CGSFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 Col17 BSCC DPH AGR DWR CEC CA SL SLC Adopting agency BSC BSC-
CGSFM 1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5 6 6 6 6 6 6 6 6 6 Adopt entire chapter X Adopt entire chapter as
amended (amended
sections listed below)Adopt only those sections
that are listed belowChapter / Section The state agency does not adopt sections identified with the following symbol: The Office of the State Fire Marshal’s adoption of this chapter or individual sections is applicable to structures regulated by other state agencies pursuant to Section 1.11.
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31C [DPH] RADIATION
SECTION 3101C—SCOPE
For the purpose of this chapter, the following terms shall have the meaning indicated:
PRIMARY PROTECTIVE BARRIER is a barrier to attenuate the useful beam.
SECONDARY PROTECTIVE BARRIER is a barrier to attenuate stray radiation.
STRAY RADIATION is radiation not serving any useful purpose, which includes leakage and scattered radiation.
USEFUL BEAM is the radiation which passes through the window, aperture, cone or other collimating device of the tube housing.
SECTION 3102C—RADIATION SHIELDING BARRIERS
All radiation shielding barriers in rooms and enclosures housing machines shall meet the requirements of Section 12-31C-101, Chapter 12-31C, Part 12, California Referenced Standards Code. The Department of Health Services is the only agency that may grant a variance or exception to these standards.
SECTION 3103C—MEDICAL RADIOGRAPHIC AND PHOTOFLUOROGRAPHIC INSTALLATIONS
CRSC § 12-16 Medium relevance — show source text
CALIFORNIA STANDARD FOR RESIDENTIAL EXCESS FLOW ACTUATED AUTOMATIC GAS SHUTOFF VALVES (SEE CCR TITLE 24, PART 5, CHAPTER 12) STANDARD 12-16-2
DIVISION OF THE STATE ARCHITECT
Authority: Sections 19200–19204, Health and Safety Code. Reference: Sections 19201.5 and 19202, Health and Safety Code.
DIVISION 1—CONSTRUCTION
SCOPE
Sec. 12-16-201. The American Society for Testing and Materials (ASTM) F2138-12(2017) Standard Specification for Excess Flow Valves for Natural Gas Service, and the American National Standards Institute (ANSI) Z21.93-2017/CSA 6.30-2017 Excess Flow Valves for Natural and LP Gas with Pressure up to 5 psig, shall be the applicable standards used by the Division of the State Architect for certification of these devices.
Sec. 12-16-201.1. Each installation of a customer-owned device that satisfies this standard shall be in accordance with the California Plumbing Code (CCR Title 24, Part 5).
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12-31C RADIATION SHIELDING STANDARDS
STANDARD 12-31C-1
DEPARTMENT OF HEALTH SERVICES
Authority: Sections 102, 208 and 25811.
Reference: Sections 102, 208 and 436.5.
ALL HEALING ARTS X-RAY INSTALLATIONS
Sec. 12-31C-101. All radiation shielding barriers in rooms and enclosures housing radiation machines shall comply with the mandatory standards and appendices in Report No. 35, “Dental X-RAY Protection”; Report 49, “Structural Shielding Design and Evaluation for Medical use of X-rays and Gamma Rays of Energies up to 10 MeV”; and Report No. 51, “Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities.” Published by the National Council on Radiation Protection and Measurements, 7910 Woodmont Avenue, Bethesda, Maryland 20814.
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12-71 AIR FILTERS
STANDARD 12-71-1
STATE FIRE MARSHAL
DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS
Sec. 12-71-100.
(a) Test apparatus.
- The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
CRSC § 31B-20 Medium relevance — show source text
3154B Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31B-20
3155B Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31B-20
3156B Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31B-20
3157B Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31B-21
3158B Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31B-21
3159B Reserved. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31B-21
DIVISION II – PUBLIC SWIMMING POOLS. . . . . . . . . . . . . . .31B-21
3160B Ground Fault Circuit Interrupters. . . . . . . . . . . . . . . . 31B-21
3161B Wading Pools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31B-21
3162B Anti-Entrapment Devices and Systems . . . . . . . . . . 31B-22
CHAPTER 31C RADIATION . . . . . . . . . . . . . . . . . . . . . . . . . .31C-1
3101C Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31C-3
3102C Radiation Shielding Barriers . . . . . . . . . . . . . . . . . . . . . 31C-3
3103C Medical Radiographic and Photofluorographic Installations. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31C-3
3104C Medical Therapeutic X-Ray Installations. . . . . . . . . . 31C-3
CHAPTER 31D FOOD ESTABLISHMENTS. . . . . . . . . . . . . . .31D-1
3101D Scope. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31D-3
CRSC § 25-50 Medium relevance — show source text
kVA 12,000/20,780GrdY
240/120 VCol3 17,200
240/120 V20,780
240/120 VCol6 kVA No Switch With
Single-
Phase
SwitchNo Switch No Switch With Single-Phase Switch 25 2623891 − 2623951 2624361 − 50 2623911 − 2623961 2624371, E − 100 2623931, E 0138841, E 2623971 2624381, E 2624391, E 167 2623944, E 2621814, E 262398, 4, E 2630504 E − Table 6 Codes for Subsurface Horizontal, Single-Phase With 6 Primary Bushings With 2 (25-50 kVA) or 4 (75−167 kVA) Hot Secondary Leads. Neutral Lead May Be Permanently Grounded. (reference Document 060578 and Spec. 91) − Self-Protected, Stainless Steel
kVA 12,000/20,780GrdY
240/120 VCol3 17,200 − 240/120 V Col5 20,780 − 240/120 V Col7 kVA No Switch With
Three-Phase
SwitchNo Switch With
Three-Phase
SwitchNo Switch With
Three-Phase
Switch25 2603281 0272641, E 2611061 − 2611021 − 50 260668 1, E − 2611071, E − 2611031, E − 100 2608821, E 0272661, E 2611081 0272691, E 2611041, E 0272671, E 167 2610004, E − 261109 4, E − 2611054, E − Table 7 Codes for Subsurface Round, Single-Phase With 3 Secondary Bushings, Neutral May be Permanently Grounded. Use to Supply Single-Phase Load. (reference Document 035313 and Spec. 91) − Self-Protected, Stainless Steel
kVA 4160/7200Y
240/120 V
4 Primary Bushings4,160GrdY/2,400
240/120 V
2 Primary BushingsCol4 kVA No Switch No Switch With Single-Phase Switch 100 2623711, E 2621201, E 2621431, E (See Table 36 on Page 14 for other single-phase round transformers.)
1 Current standard design and may be purchased. 2
3
CRSC § 1974-17 Medium relevance — show source text
Adopting agency BSC BSC-
CGSFM HCD Col6 Col7 DSA Col9 Col10 OSHPD Col12 Col13 Col14 Col15 Col16 BSCC DPH AGR DWR CEC CA SL SLC Adopting agency BSC BSC-
CGSFM 1 2 1/AC AC SS SS/CC 1 1R 2 3 4 5 5 5 5 5 5 5 5 5 Adopt entire chapter Adopt entire chapter as
amended (amended
sections listed below)X X Adopt only those sections
that are listed belowChapter / Section AAMA X ACCA X ANSI X X ASME X ASTM X X ASTM E108-2020a X CSA X DASMA X ICC X X IFC-18 X ISO X NFPA X X NFPA 68-13 X SFM X UBC X UL X UL 790 Edition 9 2022 X UL 1974-17 X UL 9540-20 X UL 9540 Edition 4 2019 X WDMA X The state agency does not adopt sections identified with the following symbol: †
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Part IX— Referenced Standards
44 REFERENCED STANDARDS
Notwithstanding California laws and regulations, these referenced standards shall be applicable only to those California Residential Code sections that are adopted.
User notes:
CRSC § 436.5. Medium relevance — show source text
DEPARTMENT OF HEALTH SERVICES
Authority: Sections 102, 208 and 25811.
Reference: Sections 102, 208 and 436.5.
ALL HEALING ARTS X-RAY INSTALLATIONS
Sec. 12-31C-101. All radiation shielding barriers in rooms and enclosures housing radiation machines shall comply with the mandatory standards and appendices in Report No. 35, “Dental X-RAY Protection”; Report 49, “Structural Shielding Design and Evaluation for Medical use of X-rays and Gamma Rays of Energies up to 10 MeV”; and Report No. 51, “Radiation Protection Design Guidelines for 0.1-100 MeV Particle Accelerator Facilities.” Published by the National Council on Radiation Protection and Measurements, 7910 Woodmont Avenue, Bethesda, Maryland 20814.
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12-71 AIR FILTERS
STANDARD 12-71-1
STATE FIRE MARSHAL
DESCRIPTION OF TEST APPARATUS, METHOD AND CLASSIFICATION REQUIREMENTS FOR AIR FILTERS
Sec. 12-71-100.
(a) Test apparatus.
- The test duct, made of M.S. gage galvanized sheet metal reinforced with angle irons, is 21 inches square (13 548 mm [2] ) and 13 [1] / 2 feet (4114 mm) long.
- One end of the duct is tapered to the discharge of a variable-speed blower and the other end is open to discharge. A metal filter frame is provided near the middle of the length of the duct to receive one 20 by 20 inches (508 mm by 508 mm) (nominal) filter unit. Two tightfitting doors, located to permit access to the filter frame, are each provided with a mica window to permit observation of both faces of the filter and conditions in the duct downstream from the filter.
- Two 1-inch (25 mm) pipe elbows, about 18 inches (457 mm) from the base of the test filter, form gas burner outlets adjusted to provide yellow, wavering flames. The burners consume approximately 4 cubic feet (approximately 1,000 Btu/cubic feet) of gas per minute.
- With the filter in place the air velocity is adjusted to approximately 200 linear feet per minute as measured at the discharge end of the duct by an Alnor Velometer Anemometer.
(b) Test method.
- Filters are tested clean, that is, unused. The flames are applied for 3 minutes during which time observations are made of both faces of the filter as to the downstream travel of flame or sparks and the density, duration and character of the products of combustion.
CRSC § 12-74 Medium relevance — show source text
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INTERIOR ENVIRONMENT
1226.5.4 Support areas for staff.
1226.5.4.1 Staff toilet(s). Refer to Section 1226.4.17.1.
1226.5.4.2 Storage for employees. Refer to Section 1226.4.17.2.
RADIOLOGICAL/IMAGING SERVICE SPACE.
1226.5.5 Radiological/imaging service space. When x-ray examination services, computerized tomography scanning, magnetic resonance imaging, ultrasound and/or mammography services are provided, the radiological/imaging services space shall comply with the provisions of this section.
1226.5.5.1 Support spaces for radiological/imaging services. The following spaces are common to the imaging service area and are minimum requirements:
1226.5.5.1.1 Patient toilet room(s). In service spaces with procedure rooms that do not require dedicated patient toilets, provide a minimum of one patient toilet room within the service space, refer to Section 1226.4.14.1.
1226.5.5.1.2 Outpatient change area. A separate space shall be provided where outpatients change from street clothing. This shall include provisions for clothing storage, space for clothing change and gowning area. Dressing rooms shall be readily accessible to the imaging rooms.
1226.5.5.1.3 Staff facilities. In service space of three or more procedure rooms, staff toilet room(s) internal to the service space.
1226.5.5.1.4 Handwashing stations. Handwashing stations shall be located within the unit.
1226.5.5.1.5 Imaging storage (active). If imaging storage systems are used, provide a means of sorting and filing patient film or electronic media for immediate retrieval shall be provided.
1226.5.5.1.6 Medication station. Provision shall be made for locked storage of medications and drugs. Refer to Section 1226.4.13.2.
1226.5.5.1.7 Areas for off-site laundry services. Refer to Section 1226.4.15.1.
1226.5.5.2 Radiation protection. Radiation protection requirements for equipment refer to Section 1224.18.1.1.
1226.5.6 X-ray examination services . When provided, x-ray examination services space shall comply with the following:
1. X-ray room. 2. When shielded control alcove with protective view windows is provided, refer to Section 1224.18.1.1. 3. Fluoroscopy room, when provided, shall have a toilet room directly accessible to the fluoroscopy room. This toilet room is in addition to common patient toilet room facilities located in the radiological/imaging service space. 4. Space for processing images. 5. An office or other suitable area for viewing and reporting radiographic examination.
CRSC § 17958.5 Medium relevance — show source text
Amendments, additions and deletions to this code adopted by a city, county, or city and county_ pursuant to California Health and Safety Code Sections 17958.5, 17958.7 and 18941.5, together with all applicable portions of this code, shall also become effective 180 days after publication of the California Building Standards Code by the California Building Standards Commission.
1.8.6.2 Findings, filings and rejections of local modifications. Prior to making any modifications or establishing more restrictive building standards, the governing body shall make express findings and filings, as required by California Health and Safety Code Section 17958.7, showing that such modifications are reasonably necessary due to local climatic, geological or topographical conditions. No modification shall become effective or operative unless the following requirements are met: 1. The express findings shall be made available as a public record. 2. A copy of the modification and express finding, each document marked to cross-reference the other, shall be filed with the California Building Standards Commission for a city, county, or city and county and with the Department of Housing and Community Development for fire protection districts. 3. The California Building Standards Commission has not rejected the modification or change.
Nothing in this section shall limit the authority of fire protection districts pursuant to California Health and Safety Code Section 13869.7(a).
SECTION 1.8.7—ALTERNATE MATERIALS, DESIGNS, TESTS AND METHODS OF CONSTRUCTION
1.8.7.1 General. The provisions of this code, as adopted by the Department of Housing and Community Development are not intended to prevent the use of any alternate material, appliance, installation, device, arrangement, design or method of construction not specifically prescribed by this code. Consideration and approval of alternates shall comply with Section 1.8.7.2 for local building departments and Section 1.8.7.3 for the Department of Housing and Community Development.
1.8.7.2 Local building departments. The building department of any city, county, or city and county may approve alternates for use in the erection, construction, reconstruction, movement, enlargement, conversion, alteration, repair, removal, demolition or arrangement of apartments, condominiums, hotels, motels, lodging houses, dwellings or accessory structures, except for the following: 1. Structures located in mobilehome parks as defined in California Health and Safety Code Section 18214. 2. Structures located in special occupancy parks as defined in California Health and Safety Code Section 18862.43. 3. Factory-built housing as defined in California Health and Safety Code Section 19971.
1.8.7.2.1 Approval of alternates. The consideration and approval of alternates by a local building department shall comply with the following procedures and limitations: 1. The approval shall be granted on a case-by-case basis. 2. Evidence shall be submitted to substantiate claims that the proposed alternate, in performance, safety and protection of life and health, conforms to, or is at least equivalent to, the standards contained in this code and other rules and regulations promulgated by the Department of Housing and Community Development. 3. The local building department may require tests performed by an approved testing agency at the expense of the owner or owner’s agent as proof of compliance. _4.
CRSC § 15-11 Medium relevance — show source text
COMPLIANCE FORMS, WORKSHEETS AND REFERENCE MATERIAL
FOR REFERENCE ONLY: The following table has been reprinted from the IES TM-15-11 Reference standard, see Section 5.106.8.
IES TM-15-11 TABLE A-1—BACKLIGHT RATINGS (Maximum Zonal Lumens) Col2 Col3 Col4 Col5 Col6 SECONDARY SOLID ANGLE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE SECONDARY SOLID ANGLE LZ 0 LZ 1 LZ 2 LZ 3 LZ 4 Backlight High (BH)
60 to 80 degrees110 500 1,000 2,500 5,000 Backlight Medium (BM)
30 to < 60 degrees220 1,000 2,500 5,000 8,500 Backlight Low (BL)
0 to < 30 degrees110 500 1,000 2,500 5,000 FOR REFERENCE ONLY: The following table has been reprinted from the California Energy Code, Part 6, Title 24, see Section 5.106.8.
TABLE 130.2-A—UPLIGHT RATINGS (Maximum Zonal Lumens) Col2 Col3 Col4 Col5 Col6 SECONDARY SOLID ANGLE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE MAXIMUM ZONAL LUMENS PER OUTDOOR LIGHTING ZONE SECONDARY SOLID ANGLE LZ 0 LZ 1 LZ 2 LZ 3 LZ 4 Uplight High (UH)
100 to 180 degrees0 10 50 500 1,000 Uplight Low (UL)
90 to < 100 degrees0 10 50 500 1,000 FOR REFERENCE ONLY: The following table has been reprinted from the California Energy Code, Part 6, Title 24, see Section 5.106.8.
TABLE 130.2-B—GLARE RATINGS (Maximum Zonal Lumens) Col2 Col3 Col4 Col5 Col6 GLARE RATING FOR ASYMMETRICAL LUMINAIRE TYPES
(Type I, Type II, Type III, Type IV)GLARE RATING FOR ASYMMETRICAL LUMINAIRE TYPES
**(Type I, Type II, Type III,
Frequently asked questions
Which referenced standards must I use for shielding calculations?
Shielding barriers must comply with Sec. § 12‑31C‑101, which mandates the NCRP reports used for design: Report No. 35, Report No. 49 and Report No. 51 (as applicable to energies and equipment).
Where in the California Building Code are therapy‑room requirements set?
See Chapter 31C (Radiation) — notably § 3101C (scope), § 3102C (radiation shielding barriers referencing § 12‑31C‑101) and § 3104C (medical therapeutic X‑ray installations) for barrier, window, interlock and operational requirements.
Who can grant a variance or exception to these shielding standards?
The code specifies that the Department of Public Health (Department of Health Services) is the agency that may grant variances or exceptions to the referenced standards.
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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