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Every 2024 IRC section and the IBC as it loads, by number or topic, plus the local rules for your city. Free to search.

Detached houses, duplexes and townhouses up to 3 stories with their own exits use the IRC; every other building uses the IBC (IBC 101.2).

41 sections matching “E3905” for San Antonio, TX, the 2024 IRC and IBC

  • E3905.1

    Box, Conduit Body or Fitting—Where Required

    • A box or conduit body goes at every splice, junction, termination, transition, switch, pull point and outlet, using fittings only with their listed methods (NEC 300.15).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.3

    Nonmetallic Boxes

    • Nonmetallic boxes are used only with nonmetallic wiring unless they have internal bonding between all entries (NEC 314.3).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.4

    Minimum Depth of Boxes for Outlets, Devices, and Utilization Equipment

    • Boxes are deep enough to mount equipment without damaging conductors (NEC 314.24).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.5

    Boxes Enclosing Flush-Mounted Devices or Flush Equipment

    • Boxes for flush devices enclose them on back and sides, and box-mounting screws don't hold the device (NEC 314.19).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.6

    Boxes at Luminaire Outlets

    • Luminaire outlet boxes are designed to support the fixture (NEC 314.27(A)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.8

    Boxes at Fan Outlets

    • Fan-support boxes are marked for fans and carry no more than 70 lb (marked weight if over 35 lb); habitable-room ceiling boxes where a fan could go are fan-rated or allow access to framing (NEC 314.27(C)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.9

    Utilization Equipment

    • Boxes supporting other equipment meet the luminaire weight rules; 6 lb or less may use other boxes with two #6 screws (NEC 314.27(D)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.10

    Conduit Bodies, Handhole Enclosures and Junction, Pull and Outlet Boxes to Be Accessible

    • Boxes and conduit bodies stay accessible without removing building parts or digging up paving; buried listed boxes are marked (NEC 314.29).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.11

    Damp or Wet Locations

    • Boxes in damp or wet locations keep water out, wet ones are listed, and field drain holes are 1/8 to 1/4 in (NEC 314.15).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12

    Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies

    • Box and conduit body volume is at least the calculated fill (NEC 314.16).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.13

    Screw or Other Fasteners

    • Field screws into wiring spaces are blunt machine screws: cover screws at most 3/8 in in, others at most 5/16 in, flush in boxes up to 100 cu in.

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.1.2

    Protection

    • No box where cable enters or leaves a protective sleeve, but the sleeve ends get fittings (NEC 300.15(C)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.1.3

    Integral Enclosure

    • Devices with an identified integral enclosure may replace a box with NM cable in frame construction (NEC 300.15(E)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.1.7

    Wiring Methods With Interior Access

    • Wireways, multioutlet assemblies, gutters and surface raceways with accessible removable covers need no separate boxes (NEC 300.15(A)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.3.1

    Nonmetallic-Sheathed Cable Entering Boxes

    • NM cable sheath enters the box at least 1/4 in and is secured, except in single-gang boxes no larger than 2 1/4 x 4 in where the cable is stapled within 8 in (NEC 314.17(B)(2)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.3.2

    Conductor Rating

    • Nonmetallic boxes are rated for the lowest-temperature conductor entering (NEC 314.17(B)(4)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.4.1

    Outlet Boxes Without Enclosed Devices or Utilization Equipment

    • Boxes without devices are at least 1/2 in deep (NEC 314.24(A)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.4.2

    Utilization Equipment

    • Device boxes: equipment depth + 1/4 in if it projects over 1 7/8 in; 2 1/16 in for 8-4 AWG; 1 3/16 in for 12-10 AWG; 15/16 in for 14 AWG and smaller (NEC 314.24(B)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.6.1

    Vertical Surface Outlets

    • Wall luminaire boxes are marked with their weight limit if not 50 lb; fixtures 6 lb or less may hang from other boxes with two #6 screws (NEC 314.27(A)(1)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.6.2

    Ceiling Outlets

    • Ceiling lighting boxes support at least 50 lb; heavier luminaires are supported independently unless the box is listed for the weight (NEC 314.27(A)(2)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.6.3

    Weight-Supporting Ceiling Receptacles (WSCR) and Weight-Supporting Attachment Fittings (WSAF)

    • Lighting and fan boxes may hold listed weight-supporting ceiling receptacles with matching attachment fittings, counted in box fill (NEC 314.27(E)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.1

    Box Volume Calculations

    • Box volume includes rings and covers marked with volume; barriers take 0.5 cu in (metal) or 1.0 (nonmetallic) if unmarked (NEC 314.16(A)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.2

    Box Fill Calculations

    • Box fill adds up conductors, clamps, fittings, devices, grounds and terminal blocks; locknuts and bushings don't count (NEC 314.16(B)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.3

    Conduit Bodies

    • Conduit bodies for 6 AWG and smaller have twice the area of the largest attached conduit and carry its conductor count (NEC 314.16(C)(1)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.1.2

    Other Boxes

    • Other boxes up to 100 cu in and all nonmetallic boxes are marked with their volume (NEC 314.16(A)(2)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.2.1

    Conductor Fill

    • Each conductor entering counts once by its size volume; long loops count twice; pigtails that never leave don't count; up to four small fixture wires and a ground from a canopy are free (NEC 314.16(B)(1)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.2.4

    Device or Equipment Fill

    • Each device yoke adds two volumes for its largest conductor, more for wide devices (NEC 314.16(B)(4)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.2.5

    Equipment Grounding Conductor Fill

    • Up to four EGCs add one volume; each additional adds a quarter (NEC 314.16(B)(5)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.2.6

    Terminal Block Fill

    • Each terminal block adds one volume for its largest conductor (NEC 314.16(B)(6)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.3.1

    Splices, Taps or Devices

    • Only conduit bodies marked with their volume may hold splices, taps or devices (NEC 314.16(C)(2)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

  • E3905.12.3.2

    Short-Radius Conduit Bodies

    • Short-radius bodies like capped elbows and service-entrance ells hold no splices or devices (NEC 314.16(C)(3)).

    International Residential Code, 2024 · Chapter 39, Power and Lighting DistributionRead the full text (opens UpCodes in a new tab)

Searches all 4,276 IRC 2024 sections, 5,532 IBC 2024 sections and defined terms (Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33 so far) and each city's local rules as they are added. Section numbers and titles from the International Residential Code and International Building Code, 2024 editions, copyrighted by the International Code Council; the IRC's electrical chapters (34 to 43) follow NFPA 70, the National Electrical Code. Requirements are summarized in our words (IRC Chapters 3 to 43, IBC Chapters 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33); read the full text at the link on each result. Local values come from each city's published documents.

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