Where must gas vents terminate and required clearances?

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

• CRC § 12.7.2 High relevance — show source text

  (4) Screws, rivets, and other fasteners shall not penetrate the inner wall of double-wall gas vents, except at the transition from the appliance draft hood outlet, flue collar, or single-wall metal connector to a double-wall vent.

  [NFPA 54:12.7.2]

  509.6.1 Gas Vent Termination. The termination of gas vents shall comply with the following requirements:

  (1) A gas vent shall terminate in accordance with one of the following:

  (a) Gas vents that are 12 inches (300 mm) or less in size and located not less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall

  terminate above the roof in accordance with Figure 509.6.1 and Table 509.6.1.

  (b) Gas vents that are over 12 inches (300 mm) in size or are located less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall terminate not less than 2 feet (610 mm) above the highest point where they pass through the roof and not less than 2 feet (610 mm) above any portion of a building within 10 feet (3048 mm) horizontally.

  (c) Industrial appliances as provided in Section 509.2.5.

  (d) Direct-vent systems as provided in Section 509.2.6.

  (e) Appliances with integral vents as provided in Section 509.2.7.

  (f) Mechanical draft systems as provided in Section 509.3.3 through Section 509.3.3.4.

  (g) Ventilating hoods and exhaust systems as provided in Section 509.3.4.

  (2) A Type B or a Type L gas vent shall terminate at least 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood or flue collar.

  (3) A Type B-W gas vent shall terminate at least 12 feet (3658 mm) in vertical height above the bottom of the wall furnace.

  (4) A gas vent extending through an exterior wall shall not terminate adjacent to the wall or below eaves or parapets, except as provided in Section 509.2.6 and Section 509.3.3 through Section 509.3.3.4.

  (5) Decorative shrouds shall not be installed at the termination of gas vents except where such shrouds are listed for use with the specific gas venting system and are installed in accordance with the manufac turer’s installation instructions.

  (6) All gas vents shall extend through the roof flashing, roof jack, or roof thimble and terminate with a listed cap or listed roof assembly.

  (7) A gas vent shall terminate at least 3 feet (914 mm) above a forced air inlet located within 10 feet (3048 mm). [NFPA 54:12.7.3]

  FIGURE 509.6.1

  TERMINATION LOCATIONS FOR GAS

  VENTS WITH LISTED CAPS 12 INCHES OR LESS IN SIZE

  AT LEAST 8 FEET FROM A VERTICAL WALL

  [NFPA 54: FIGURE 12.7.3]

  TABLE 509.6.1

  ROOF SLOPE HEIGHTS

  [NFPA 54: TABLE 12.7.3]

• CRC § 10-09 High relevance — show source text

  B. PG&E will position gas regulators to minimize the length of the regulator vent lines and to ensure adequate venting capacity.

                                                          - “ −
  

  C. PG&E will specify regulator vent lines, in accordance with Gas Design Standard H 93, Regulator Vent Lines

  Above Ground,” when required.

  3. Regulator Vent Locations

  A. Service regulator vents must terminate in a safe outside location that complies with the following criteria:

  (1) The regulator vent must not terminate near any sources of ignition or openings into the building. The regulator vent must be 36 inches horizontally from sources of ignition and openings into the building, and this clearance area will extend 10 feet above and 36 inches below the regulator vent termination.

  (2) A minimum lateral distance of 8 feet from a forced air intake. This includes the intake vents for the gas meter room.

  (3) Within any location that is under display platforms or show windows in commercial buildings, including any permanent, elevated, display floors or platforms associated with the window.

  (4) Within any location that is under building overhangs, where the overhang is likely to direct venting gas into a building opening.

  B. Vents for all natural gas regulator and gas monitor diaphragm equipment must terminate above a reasonable flood level. Regulator vent extensions must be separate lines, terminated so they are protected from the rain and provided with screened fittings to prevent insects and other debris from entering the vent.

  C. Vent locations must have final approval by PG&E.

  Page 6 of 11 PG&E Internal Information, SL2 © 2013 Pacific Gas & Electric Company. All Rights Reserved. Prepared by: AAJ7

  Gas Meter Room J-16

  Rev. #03a 10-09-13

  Requirements for PG&E-Owned Equipment

  1. Natural Gas Metering

  Electrical grounding or bonding to PG&E’s metering facility piping or equipment or to customer-owned house lines inside of the meter room is not permitted.

  2. Land-Line Cable and Conduit

  Customers with an estimated average use of 10,000 therms per month or more are required to install, own, and maintain a nominal 1” diameter conduit and a telephone cable. PG&E’s requirements for the conduit are described below.

  A. Applicant/customer must extend the conduit and telephone cable from the closest telephone service location (i.e., outdoor “general purpose” area) to a location specified by PG&E that will be at or near the gas metering facilities. The maximum allowable distance from the telephone service location to PG&E’s gas meter is 50 feet.

  B. Conduit must terminate within 3 feet of the gas meter location.

  C. Applicant must install a conduit seal, inside the gas meter room, within 18 inches of the boundary where the conduit enters the gas meter room. There must be no conduit fitting between the boundary and the seal. PG&E will pour the conduit seal.

  D. Applicant/customer is responsible for all charges and costs associated with installing the telephone facilities necessary to provide telephone service for PG&E’s gas metering facilities which are to be used for PG&E’s purposes.

  E. PG&E is responsible for establishing telephone service and for the ongoing telephone service charges for gas metering purposes.

  3. Additional Equipment Needed to Support Gas Meters

  Consideration must be given to the design requirements for:

  A. Volume pulse output connections.

  B. Electronic correctors.

• CRC § 509.2.6 High relevance — show source text

  (2) A Type B or a Type L gas vent shall terminate at least 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood or flue collar.

  (3) A Type B-W gas vent shall terminate at least 12 feet (3658 mm) in vertical height above the bottom of the wall furnace.

  (4) A gas vent extending through an exterior wall shall not terminate adjacent to the wall or below eaves or parapets, except as provided in Section 509.2.6 and Section 509.3.3 through Section 509.3.3.4.

  (5) Decorative shrouds shall not be installed at the termination of gas vents except where such shrouds are listed for use with the specific gas venting system and are installed in accordance with the manufac turer’s installation instructions.

  (6) All gas vents shall extend through the roof flashing, roof jack, or roof thimble and terminate with a listed cap or listed roof assembly.

  (7) A gas vent shall terminate at least 3 feet (914 mm) above a forced air inlet located within 10 feet (3048 mm). [NFPA 54:12.7.3]

  FIGURE 509.6.1

  TERMINATION LOCATIONS FOR GAS

  VENTS WITH LISTED CAPS 12 INCHES OR LESS IN SIZE

  AT LEAST 8 FEET FROM A VERTICAL WALL

  [NFPA 54: FIGURE 12.7.3]

  TABLE 509.6.1

  ROOF SLOPE HEIGHTS

  [NFPA 54: TABLE 12.7.3]

  ROOF SLOPE	H (minimum) (feet)
  Flat to6⁄12	1.0
  Over6⁄12 to7⁄12	1.25
  Over7⁄12 to8⁄12	1.5
  Over8⁄12 to9⁄12	2.0
  Over9⁄12 to10⁄12	2.5
  Over10⁄12 to11⁄12	3.25
  Over11⁄12 to12⁄12	4.0
  Over12⁄12 to14⁄12	5.0
  Over14⁄12 to16⁄12	6.0
  Over16⁄12 to18⁄12	7.0
  Over18⁄12 to20⁄12	7.5
  Over20⁄12 to21⁄12	8.0

  For SI Units: 1 inch = 25.4 mm, 1 foot = 304.8 mm

  509.6.1.1 Insulation Protection Shield. Where a vent passes through an insulated assembly, an approved metal shield constructed of steel having a thickness of not less than 26 gauge (0.0179 inch) (0.45 mm) (No. 26 gauge) shall be installed between the vent and insulation. The shield shall extend not less than 2 inches (51 mm) above the insulation and be secured to the structure in accordance with the

  manufacturer’s installation instructions.

  509.6.2 Size of Gas Vents. Venting systems shall be sized and constructed in accordance with Section

• CRC § 802.2.5. High relevance — show source text

  (b) Gas vents that are over 12 inches (300 mm) in size or are located less than 8 feet (2438 mm) from a vertical wall or similar obstruction shall

  terminate not less than 2 feet (610 mm) above the highest point where they pass through the roof and not less than 2 feet (610 mm) above a portion of a building within 10 feet (3048 mm) horizontally.

  (c) Industrial appliances as provided in Section 802.2.5.

  (d) Direct vent systems as provided in Section 802.2.6.

  (e) Appliances with integral vents as provided in Section 802.2.7.

  (f) Mechanical draft systems as provided in Section 802.3.3 through Section 802.3.3.4.

  (g) Ventilating hoods and exhaust systems as provided in Section 802.3.4.

  (2) A Type B or a Type L gas vent shall terminate at least 5 feet (1524 mm) in vertical height above the highest connected appliance draft hood or flue collar.

  (3) A Type B-W gas vent shall terminate at least 12 feet (3658 mm) in vertical height above the bottom of the wall furnace.

  (4) A gas vent extending through an exterior wall shall not terminate adjacent to the wall or below eaves or parapets, except as provided in Section 802.2.6 and Section 802.3.3 through Section 802.3.3.4.

  (5) Decorative shrouds shall not be installed at the termination of gas vents except where such shrouds are listed for use with the specific gas venting system and are installed in accordance with the manufac turer’s installation instructions.

  (6) All gas vents shall extend through the roof flashing, roof jack, or roof thimble and terminate with a listed cap or listed roof assembly.

  (7) A gas vent shall terminate at least 3 feet (914 mm) above a forced air inlet located within 10 feet (3048 mm). [NFPA 54:12.7.3]

  FIGURE 802.6.1

  TERMINATION LOCATIONS FOR

  GAS VENTS WITH LISTED CAPS 12 INCHES OR LESS IN

  SIZE NOT LESS THAN 8 FEET FROM A VERTICAL WALL

  [NFPA 54: FIGURE 12.7.3]

  2025 CALIFORNIA MECHANICAL CODE 157

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  CHIMNEYS AND VENTS

  TABLE 802.6.1

  ROOF SLOPE HEIGHTS

  [NFPA 54: TABLE 12.7.3]

• CRC § 2-17. High relevance — show source text

  Notes in reference to Figure 2-17.

  1. Customers must provide a 78-inches x 36-inches x 4-inches concrete pad with minimum #4 rebar.

  2. Customers must provide a 3-inch ANSI 150 flat-face flange to connect to PG&E facilities.

  3. If the meter set is built next to a building wall, place the vertical leg of the riser and the houseline 20 inches away from the wall. This is to ensure the meter set components are built in a straight line.

  4. The finished grade must be below the bury-line marking on the service riser.

  5. PG&E’s weld elbow is optional.

  6. The regulator vent must not terminate near any sources of ignition or openings into the building. The riser must be a minimum distance of 36 inches from sources of ignition and openings into the building, or any wet facility. This clearance area extends 10 feet above the highest regulator vent, 36 inches below the lowest regulator vent, and 12 inches beyond the farthest PG&E meter-set equipment.

  2-31 2022 – 2023

  Section 2, Gas Service

  2.4.2. (continued) 5. Figure 2-18 represents a rotary gas meter with 7,001 through 16,000 scfh at an approved delivery pressure.

  Enclosure Requirements

  Figure 2-18 Gas Meter Connection Using an 11M or 16M Rotary Gas Meter

  Notes in reference to Figure 2-18.

  1. Customers must provide a 96-inch x 36-inch x 4-inch concrete pad with minimum #4 rebar.

  2. Customers must provide a 4-inch ANSI 150 flat−face flange to connect to PG&E facilities.

  3. If the meter set is built next to a building wall, place the vertical leg of the riser and the houseline 20-inches minimum away from the wall. This ensures the meter set components are built in a straight line.

  4. The finished grade must be below the bury-line marking on the service riser.

  5. PG&E’s weld elbow is optional.

  6. The regulator vent must not terminate near any sources of ignition or openings into the building. The riser must be a minimum distance of 36 inches from sources of ignition, openings into the building, or any wet facility. This clearance area extends 10 feet above the highest regulator vent, 36 inches below the lowest regulator vent, and 12 inches beyond the farthest PG&E meter-set equipment.

  2022 – 2023 2-32

  Section 2, Gas Service

  2.4.2. (continued)

  Contact your local project coordinator about possible locations for regulator vents. (The regulations for large, industrial meter sets can vary.)

  D. Minimum Meter Set Clearance Requirements

  Figure 2-19, “Electric and Gas Meter Set Separation Dimensions and Clearances,” below; Figure 2-20, “Gas Meter Set Clearance from Building Openings,” on Page 2-35; and Figure 2-21, “Gas Regulator Set Clearance Requirement from Sources of Ignition,” on Page 2-36, all represent various metering facilities’ clearance requirements. If applicants install enclosures on their premises, the enclosures must meet the clearances provided in these illustrations.

  See Figure 2-20 and Note 5 on Page 2-35

  Figure 2-19 Electric and Gas Meter Set Separation Dimensions and Clearances

  Notes in reference to Figure 2-19.

• CRC § 2-21 High relevance — show source text

  8’ Min.

  Pad-Mounted Transformers,. All Electric Equip. and Air-Intake Vents Exhaust Fan	Col2	Col3	Col4
  Wiring (e.g., Central Air, Exhaust Fan) (See Notes 1 & 2) 3’ Min. 3’ Min. Air-Intake Vents (See Notes 1 & 2	Wiring (e.g., Central Air, Exhaust Fan) (See Notes 1 & 2) 3’ Min. 3’ Min. Air-Intake Vents (See Notes 1 & 2	Wiring (e.g., Central Air, Exhaust Fan) (See Notes 1 & 2) 3’ Min. 3’ Min. Air-Intake Vents (See Notes 1 & 2	Wiring (e.g., Central Air, Exhaust Fan) (See Notes 1 & 2) 3’ Min. 3’ Min. Air-Intake Vents (See Notes 1 & 2

  Figure 2-21 Gas Regulator Set Clearance Requirement from Air-Intake and Exhaust Fans

  Notes in reference to Figure 2-21.

  1. An 8-foot minimum horizontal and 10-foot minimum vertical clearance is required from the gas service riser to air-intake vents.

  2. For a large meter set or multimeter manifold, this clearance requirement will extend 8 feet beyond the farthest PG&E meter equipment.

  E. Panel Replacements and Conduit Connections to Existing Electric Panels, 400 Amps and Less, within the Gas Clearance Area

  Electric panel upgrades, “like-for-like” panel replacements, and new electric conduit connections to existing electric meter panels may be allowed for an existing electric meter panel that resides within the gas clearance area as shown in Figure 2-19, “Electric and Gas Meter Set Separation Dimensions and Clearances, on Page 2-33, if all the following requirements are met:

  1. The electric panel and electric conduit and equipment must not reside within the 36-inch radius from the gas regulator vent opening.

  2. The electric panel must not reside within 12 inches on either side of PG&E gas facilities and 10 feet above the regulator vent opening as shown in Figure 2-22, “Clearance Requirements for an Existing Electric Meter/Panel,” on Page 2-38. If any portion of the existing electric panel resides within this area, the electric panel must be relocated outside all clearance areas shown in Figure 2-22 before the panel is replaced and any conduit connection is made.

  3. Additional electric equipment/devices must not be installed within the clearance areas shown in Figure 2-22.

  2022 – 2023 2-36

  2.4.2. (continued)

  Section 2, Gas Service

  Exception: A continuous metallic conduit with no couplings or joints can run completely through and terminate/connect outside of the 36−inch radial clearance from the gas regulator vent opening.

  4. All minimum clear and level working space requirements for the electric meter panel and gas meter set must be met.

  2-37 2022 – 2023

  Section 2, Gas Service

• CRC § 2-32 High relevance — show source text

  4. The finished grade must be below the bury-line marking on the service riser.

  5. PG&E’s weld elbow is optional.

  6. The regulator vent must not terminate near any sources of ignition or openings into the building. The riser must be a minimum distance of 36 inches from sources of ignition, openings into the building, or any wet facility. This clearance area extends 10 feet above the highest regulator vent, 36 inches below the lowest regulator vent, and 12 inches beyond the farthest PG&E meter-set equipment.

  2022 – 2023 2-32

  Section 2, Gas Service

  2.4.2. (continued)

  Contact your local project coordinator about possible locations for regulator vents. (The regulations for large, industrial meter sets can vary.)

  D. Minimum Meter Set Clearance Requirements

  Figure 2-19, “Electric and Gas Meter Set Separation Dimensions and Clearances,” below; Figure 2-20, “Gas Meter Set Clearance from Building Openings,” on Page 2-35; and Figure 2-21, “Gas Regulator Set Clearance Requirement from Sources of Ignition,” on Page 2-36, all represent various metering facilities’ clearance requirements. If applicants install enclosures on their premises, the enclosures must meet the clearances provided in these illustrations.

  See Figure 2-20 and Note 5 on Page 2-35

  Figure 2-19 Electric and Gas Meter Set Separation Dimensions and Clearances

  Notes in reference to Figure 2-19.

  1. Electric meter panel locations are subject to utility approval and must comply with the applicable code requirements. PG&E does not have specific requirements for the distance from the electric panel to the outside building corner. See Section 5, “Electric Metering: General,” for properly locating the electric meters. See Subsection 5.4.4., “Working Space,” on Page 5-17, for electric meter working space.

  Notes continued on the next page

  2-33 2022 – 2023

  Section 2, Gas Service

  2.4.2. (continued)

  Notes in Reference to Notes in reference to Figure 2-19 (continued).

  2. Applicants must not install any electrical devices or equipment, including wires, cables, metering enclosures, telecommunication enclosures, bond wires, clamps, or ground rods within the shaded area around the gas meter. The 36-inch distance can be reduced to 18 inches for electrical devices or equipment certified for NEC Class I, Division 2 locations.

  3. A solid and continuous conduit without couplings, joints, or connections is allowed to run completely through the shaded area at 6 feet or higher above the gas meter regulator vent.

  4. Place the gas service riser 6 inches to 9 inches from the finished wall. The completed customer houseline at the service delivery point must extend a minimum of 4 to 6 inches from the finished wall where the meter is to be set and must be 26 inches above the finished grade. See Figure 2-14 on Page 2-28, Figure 2-15 on Page 2-29, and Subsection 2.5. on Page 2-49.

• CRC § 802.8.3 High relevance — show source text

  802.8.3 Vent Terminals. Vent systems for Category IV appliances that terminate through an outside wall of a building and discharge flue gases perpendicular to the adjacent wall shall be located not less than 10 feet (3048 mm) horizontally from an operable opening in an adjacent building.

  Exception: This shall not apply to vent terminals that are 2 feet (610 mm) or more above or 25 feet (7620 mm) or more below operable openings. [NFPA 54:12.9.3]

  802.9 Condensation Drain. Provision shall be made to

  collect and dispose of condensate from venting systems serving Category II and Category IV appliances and noncategorized condensing appliances. [NFPA 54:12.10.1]

  802.9.1 Installation. Drains for condensate shall be

  installed in accordance with the appliance and vent manufacturers’ installation instructions. [NFPA 54:12.10.2]

  802.10 Vent Connectors for Category I Appliances. A vent connector shall be used to connect an appliance to a gas vent, chimney, or single-wall metal pipe, except where the gas vent, chimney, or single-wall metal pipe is directly connected to the appliance. [NFPA 54:12.11.1]

  802.10.1 Materials. A vent connector shall be made of

  noncombustible, corrosion-resistant material capable of

  «

  «

  TABLE 802.7.3.3 CLEARANCE FOR CONNECTORS* [NFPA 54: TABLE 12.8.4.4]	Col2	Col3	Col4	Col5
  MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL (inches)	MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL (inches)	MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL (inches)	MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL (inches)	MINIMUM DISTANCE FROM COMBUSTIBLE MATERIAL (inches)
  APPLIANCE	LISTED TYPE B GAS VENT MATERIAL	LISTED TYPE L VENT MATERIAL	SINGLE-WALL METAL PIPE	FACTORY-BUILT CHIMNEY SECTIONS
  Listed appliance with draft hoods and appliance listed for use with Type B gas vents	As listed	As listed	6	As listed
  Residential boilers and furnaces with listed gas conversion burner and with draft hood	6	6	9	As listed
  Residential appliances listed for use with Type L vents	Not permitted	As listed	9	As listed
  Listed gas-fired toilets	Not permitted	As listed	As listed	As listed
  Unlisted residential appliances with draft hood	Not permitted	6	9	As listed
  Residential and low-heat appliance other than those above	Not permitted	9	18	As listed
  Medium-heat appliance	Not permitted	Not permitted	36	As listed

  For SI units: 1 inch = 25.4 mm

  • These clearances shall apply unless the installation instructions of a listed appliance or connector specify different clearances, in which case the listed clearances shall apply.

  160 2025 CALIFORNIA MECHANICAL CODE

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  CHIMNEYS AND VENTS

• CRC § 10-09 High relevance — show source text

  3. Mechanical fans and all other electric devices must be explosion proof and meet the requirements of the NFPA-70: National Electric Code for Class I, Division 1, Group D locations.

  4. Mechanical fans and detection equipment must be continuously monitored in case of failure. Alarms for trouble and failure must be installed in accordance with NFPA-72, National Fire Alarm Code.

  Prepared by: AAJ7 PG&E Internal Information, SL2 © 2013 Pacific Gas & Electric Company. All Rights Reserved. Page 5 of 11

  Gas Meter Room J-16

  Rev. #03a 10-09-13

  Natural Gas Regulator Requirements

  1. Natural Gas Regulators

  Typically PG&E will install natural gas service regulators and overpressure protection devices outside of a meter room. Applicants/customers who want to install gas service regulators and overpressure protection devices inside of a meter room must provide PG&E with the written justification as part of the application. The preferred gas riser, meter and regulator location is outside and adjacent to the building being served. On an exception basis, gas meters and regulators may be installed in a specially designed gas meter room. PG&E must approve all gas meter and regulator installations and the gas meter room design in advance of any construction. If acceptable to PG&E, the following additional conditions apply:

  A. Each gas service regulator installed within a building must be located as near as practical to the point of the service line entrance into the meter room, and as specified by PG&E.

  B. PG&E will specify materials and designs for any overpressure protection devices needed, as outlined in Items 2 and 3 below.

  2. Regulator Vent Lines

  A. Regulators and any additional overpressure protection equipment installed indoors must be vented to the outdoors. The customer is required to provide holes (penetrations) through walls or ceilings for these vents. In rare situations where the meter room location is not adjacent to an outside wall, the customer is required to install the vent piping from the meter room to the outside wall (PG&E will determine pipe size and location). PG&E will be responsible for connecting the vent piping to the regulator or overpressure protection device.

  B. PG&E will position gas regulators to minimize the length of the regulator vent lines and to ensure adequate venting capacity.

                                                          - “ −
  

  C. PG&E will specify regulator vent lines, in accordance with Gas Design Standard H 93, Regulator Vent Lines

  Above Ground,” when required.

  3. Regulator Vent Locations

  A. Service regulator vents must terminate in a safe outside location that complies with the following criteria:

  (1) The regulator vent must not terminate near any sources of ignition or openings into the building. The regulator vent must be 36 inches horizontally from sources of ignition and openings into the building, and this clearance area will extend 10 feet above and 36 inches below the regulator vent termination.

  (2) A minimum lateral distance of 8 feet from a forced air intake. This includes the intake vents for the gas meter room.

  (3) Within any location that is under display platforms or show windows in commercial buildings, including any permanent, elevated, display floors or platforms associated with the window.

  (4) Within any location that is under building overhangs, where the overhang is likely to direct venting gas into a building opening.

• CRC § 2-13 Medium relevance — show source text

  A. Applicants must not install any electrical devices or equipment including wires, cables, metering and telecommunication enclosures, bond wires, clamps, or ground rods within 36 inches of the gas service riser.

  2-13 2022 – 2023

  Section 2, Gas Service

  2.3.4. (continued)

  This distance can be reduced to 18 inches for electrical devices or equipment certified for National Electric Code (NEC) Class I, Division 2 locations. See Figure 2-19, “Electric and Gas Meter Set Separation Dimensions and Clearances,” on Page 2-33, and Figure 2-21, “Gas Regulator Set Clearance Requirement from Air-Intake and Exhaust Fans,” on Page 2-36.

  B. Applicants must keep the area immediately behind gas meters, service facilities, and risers free and clear of all other facilities or equipment (i.e., pipes, building vents, or conduits). This requirement also applies to the area between those facilities and the premises or structure being served.

  Before installing utility conduits or gas service piping, applicants must discuss the service arrangements and coordinate the final PG&E-approved meter locations and joint trench requirements with a PG&E project coordinator.

  The joint trench composite drawing must include details of the sizes and quantities of all the equipment sharing the trench. PG&E inspectors must approve the trench after installation is complete.

  Applicants must ensure that the gas and electric meters are installed according to Figure 2-19 on Page 2-33, providing the minimum separation clearances. Refer to the following sections of this manual for acceptable electric meter utility locations.

    - [Section 2, “Gas Service,” Subsection 2.4., “Set Requirements for Gas](https://ecmappwlsp01c2.comp.pge.com/TILVIEWER?chronicleId=09131aad80dfc687&vd=false&device=false)
  

  Meters” (on Page 2-18)

    - [Section 5, “Electric Metering: General”](https://ecmappwlsp01c2.comp.pge.com/TILVIEWER?chronicleId=09131aad80e04aeb&vd=false&device=false)
  
  
    - [Section 6, “Electric Metering: Residential](https://ecmappwlsp01c2.comp.pge.com/TILVIEWER?chronicleId=09131aad80df9fc5&vd=false&device=false)
  
  
    - [Section 7, “Electric Metering: Nonresidential, Industrial, and](https://ecmappwlsp01c2.comp.pge.com/TILVIEWER?chronicleId=09131aad80e06c30&vd=false&device=false)
  

  Agricultural”

  Wet-utility piping or facilities are not permitted in a joint trench. Examples of wet utilities that are not allowed in a joint trench include the following:

    - Propane lines
  
  
    - Pressurized water lines
  
  
    - Sewer, sanitary, or storm drains
  

  Both PG&E Standard S5453, Form B, “Job Estimate Authorization for [Joint Trench Construction,”](https://www.pge.

• CRC § 3-3 Medium relevance — show source text

  Services that cross third-party property also require a 10-foot-wide easement. In some instances, the PUE may need to be wider than 10 feet. See Figure 3-3, PG&E Trench and Equipment in PUE – Example,” on Page 3-8.

  In locations along the path of the PUE where subsurface enclosures and pad-mounted equipment will be installed, the PUE must be wider to encompass the equipment being installed and to meet the minimum required working space clearances that surround the equipment. See Numbered Document 051122. If the PUE does not provide adequate space for equipment and minimum clearances, an easement granted to PG&E will be required.

  Contact your local project coordinator for questions on PUE requirements, determining the best locations for distribution facilities, and high-density housing projects with short setbacks from the property line.

  3-7 2022 – 2023

  Section 3, Electric Service: Underground

  3.2.7. (continued)

  Figure 3-3 PG&E Trench and Equipment in PUE − Example

  3.2.8. Clearances Around PG&E Facilities

  Applicants must not construct structures or install equipment, including, but not limited to, buildings, homes, customer generation equipment, agricultural wells, or expansions of existing structures over, under, to the sides, or between PG&E overhead or underground facilities, either in the public right-of-way or on private property, without maintaining the proper clearances. PG&E facilities are typically covered by an easement, right-of-way, or land-right agreement, and require minimum clearances be maintained around the facilities. When in doubt, contact the PG&E Land Department and your local project coordinator for help in determining the land rights and clearances required for existing PG&E facilities.

  3.3. Underground Service Installation Requirements

  3.3.1. Installing Services from Underground Distribution Systems

  PG&E serves applicants from an underground service if the site or lot is located in an area that is supplied from an existing underground distribution system. PG&E owns, maintains, and installs the underground service lateral conductors. PG&E provides underground-to-underground service along the shortest, most practical, and most available route to the applicant’s service-termination facility.

  Typically, the termination facility is on or within the building or structure, as shown in Figure 3-4, “Underground-to-Underground Service Connection,” on Page 3-9. PG&E installs the conductors in conduit.

  Substructures include conduit, boxes, and transformer pads. Applicants must follow PG&E’s guidelines and specifications, including those specified in Electric Rule 16 .

  PG&E installs the transformer, if required, and connects the service lateral conductors to the applicant’s termination facilities.

  2022 – 2023 3-8

  3.3.1. (continued)

  Section 3, Electric Service: Underground

  Col1	Col2	Col3	Col4

  PG&E’s Distribution Box Manhole or Switch Enclosure

  Figure 3-4 Underground-to-Underground Service Connection

  Notes in reference to Figure 3-4.

• CRC § 509.7.3.4 Medium relevance — show source text

  [See Figure 509.7.3.4(2) and Figure 509.7.3.4(3)] 5 At least 1 inch (25.4 mm) shall be between clearance reduction systems and combustible walls and ceilings for reduction systems using a ventilated air space. 6 Where a wall protector is installed on a single flat wall away from corners, it shall have a minimum 1 inch (25.4 mm) air gap. To provide adequate air circulation, the bottom and top edges, or only the side and top edges, or all edges shall be left open. 7 Mineral wool batts (blanket or board) shall have a minimum density of 8 pounds per cubic foot (lb/ft 3 ) (128 kg/m 3 ) and a minimum melting point of 1500°F (816°C). 8 Insulation material used as part of a clearance reduction system shall have a thermal conductivity of 1.0 British thermal unit inch per hour square foot degree Fahrenheit [Btu•in/(h•ft [2] - °F)] [0.1 W/(m•K)] or less. 9 At least 1 inch (25.4 mm) shall be between the appliance and the protector. The clearance between the appliance and the combustible surface shall not be

  reduced below that allowed in this table. 10 All clearances and thicknesses are minimum; larger clearances and thicknesses are acceptable. 11 Listed single-wall connectors shall be installed in accordance with the terms of their listing and the manufacturer’s installation instructions.

  2025 CALIFORNIA PLUMBING CODE 99

  ), Copyright © 2025 IAPMO, and may not be used for any other purpose or distributed to any other persons or parties.

  WATER HEATERS

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  509.8.2 Annular Spaces. Where vents, including those for direct-vent appliances or combustion air intake pipes, penetrate outside walls of buildings, the annular spaces around such penetrations shall be permanently sealed using approved materials to prevent entry of combustion products into the building. [NFPA 54:12.9.2] 509.8.3 Vent Terminals. Vent systems for Category IV appliances that terminate through an outside wall of a building and discharge flue gases perpendicular to the adjacent wall shall be located not less than 10 feet (3048 mm) horizontally from an operable opening in an adjacent building.

  Exception: This shall not apply to vent terminals that are 2 feet (610 mm) or more above or 25 feet (7620 mm) or more below operable openings. [NFPA 54:12.9.3]

  509.9 Condensation Drain. Provision shall be made to collect and dispose of condensate from venting systems serving Category II and Category IV appliances and noncategorized condensing appliances. [NFPA 54:12.10.1]

  509.9.1 Installation. Drains for condensate shall be installed in accordance with the appliance and vent manufacturers’ installation instructions. [NFPA 54:12.10.2] 509.10 Vent Connectors for Category I Appliances. A vent connector shall be used to connect an appliance to a gas vent, chimney, or single-wall metal pipe, except where the gas vent, chimney, or single-wall metal pipe is directly connected to the appliance. [NFPA 54:12.11.1]