If a receptacle has 12 AWG wire connected to it, a volume allow-ance of 2 x 2.25 or 4.5 cubic inches must be made for that particular device. For example, if a switch has 14 AWG conductors connected to it, a volume allowance of 2 x 2.0 cubic inches or 4 cubic inches is required. Each device or equipment is considered individu-ally where more than one item is contained in the box. This volume allowance is based on the largest conductor connected to a device(s) or equip-ment supported by that yoke or strap. Table 314.16(B) gives the volume allowance. A double volume allow-ance is required for each yoke or strap containing one or more devices or equipment. Minimum requirements for device or equipment fill are also provided in the Code. So the Code assigns to each conductor, clamp, support fitting, device and equipment grounding conductor an associated volume allowance. June 2012 Box Fill Calculations for Switch Boxes take up space within the box. Conductors, internal clamps, sup-port fittings, and devices such as switches and receptacles 74 IAEI NEWS May. This total volume (space) determines the number and size of conductors and wiring devices permitted to be contained in the box. Total volume is the volume of the box plus the volume of any attached plaster rings, extension rings, or domed cover. If the extension ring is made of metal and corresponds to a size listed in NEC Table 314.16(A), the appropriate volume for that size box is used as the volume of the extension ring. Where used, the space provided by plaster rings, domed covers and extension rings that are marked with their volume in cubic inches is included. Volume of a box is the total volume in cubic inches of the assembled sections. This sufficient space is needed to allow proper dissipation of heat from the contained conductors with proper air flow and circulation around the conductors. sections and, where used, the space provided by plaster rings, domed covers, extension rings, and so forth, that are marked with their volume or are made from boxes the dimensions of which are listed in Table 314.16(A). Switch boxes and other device boxes must have ade-quate volume of space (cubic inches) in order to contain the required conductors and devices (switches, etc.) to be enclosed in said box. Spare switched conductors at ceiling box will requires ceiling fan support box. Offenders may be banned.International Association of Electrical Inspectors May/June 2012: Any links to a website or blog will be removed. This is not a place to advertise products and or services. We do not endorse any contractors, and proceeding with a contractor you've met via this sub should be done at your own risk. We're all here to learn and help each other out - enjoy! No question is too stupid, too simple, or too basic. Name-calling, abusive, or hateful language is not tolerated, nor are disrespectful, personal comments. through 6 AWG) permitted in various standard size metal. This sub is not for contractors, flippers, landlords, tradesfolk or questions about ADUs/AirBnB/short-term rentals, we only allow discussion surrounding improvements to one's personal home - and posters will be met with a permanent ban.Ĭomments must be on-topic, helpful, and kind. 5.0 (2 reviews) The maximum number of conductors (for sizes 18 AWG. These guidelines, and more, can be read here before posting. We want to keep the conversations here in the sub, not just drive it away. Project-sharing posts must include narrative as well as basic info such as product details (brands/prices/purchase locations), overall budget, and a brief description of the project in the reddit text itself (not in the imgur album). Aunt, with a delicately, Wedding, BFF, Or treat yourself to a dashing and stylish. Unique Gifts For Women: Jewelry makes a great gift for Mother’s Day. Also feel free to post projects that you've completed (not in-progress). 0 Comments engagement rings are for a life time, Mom, Best Friend or Treat Yourself, Heres the ring that will change your life, Mommy, Grandmother. If you are asking a question, be as detailed as possible and include your location and multi-angled pictures if you can. This sub is for redditors to ask advice on personal home improvement projects. Images need to be uploaded through sites like and the links shared in the text of your post. Only text post submissions are allowed here.
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