![]() This applies to all equipment grounds except for an isolated equipment ground often installed on computer circuits. The allowance is based on the largest equipment grounding conductor. Where one or more equipment grounding conductors enters a box, a single volume allowance is required to be made.If a receptacle has #12 wire connected to it, a volume allowance of 2 x 2.25 or 4.5 cubic inches must be made. For example, if a switch has #14 wire 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 individually where more than one item is contained in the box. For each yoke or strap containing one or more devices or equipment, a double volume allowance is required for each yoke or strap.The hickey is no longer popular and has been replaced with hanger straps that are fastened to the box. A hickey is a fitting that can be described as a coupling that has threads the same size as the fixture stem and has an oval-shaped hole on one or more sides for the fixture wires to exit inside the box. A fixture stud is a fitting that mounts to the top of the box, usually inserts through the knockout of a metal box and is threaded to accommodate the fixture stem. Where one or more fixture studs or hickeys are present in the box, a single volume allowance is required to be made for each type of fitting in the box.No allowance is required for small fittings like locknuts and bushings.A calculation must be made of the cubic inch capacity that is required where conductors of different sizes are installed as in section 314.16(b) Box Fill Calculations. This number of conductors permitted in various boxes, as shown in the Table, applies only where all conductors are the same size.The minimum cubic inch capacity for each size is given along with the maximum number of conductors of sizes #18 through #6 that are permitted in the box. A “standard” box is one that is included in the Table. The NEC Table 314-16(a) covers the maximum number of conductors permitted within a standard metal box.Where practicable, an extension ring that is the same shape as the box can be installed that will add adequate space so the original box does not have to be replaced. Sometimes more conductors end up in boxes than were originally intended. TAYMAC 1-Gang Non-Metallic Weatherproof Recessed Box and While-In-Use Cover Kit TAYMAC 1-Gang Non-Metallic Weatherproof Recessed Box and While-In-Use Cover Kit Compare Add To List Sku 3613435 18.23 each You Save 2.25 each with Mail-In Rebate Shipping ADD TO CART Sigma Engineered Solutions 2-Gang Non-Metallic Clear While-In-Use Weatherproof.The box must have a cubic-inch capacity that equals or exceeds the total of the contained items. The cubic inch area required for each wire, clamp, support fitting, device and equipment ground is added together. The total volume determines the number and size of conductors and wiring devices that are permitted to be contained in the box.Boxes described in Table 314.16(A) that have a volume larger than is designated in the table shall be permitted to have their volume marked as required by this section. Boxes 1650 cm3 (100 in.3) or less, other than those described in Table 314.16(A), and nonmetallic boxes shall be durably and legibly marked by the manufacturer with their volume.The volumes of standard boxes that are not marked with their volume shall be as given in Table 314.16(A). ![]() What kind of wiring project do you have in mind? Our staff will help you figure out the best equipment you'll need for a successful project. And our same-day shipping will bring your order to your door more quickly. Because we work with large quantities of products and we don't have storefronts to manage and maintain, we can offer you discounts and low prices that other hardware stores can't beat. We also offer plates and boxes in a variety of styles and shapes to better fit whatever space you're working in. ![]() Hardware World is an electrician's best friend: We offer a large line of box covers, plaster rings and other outlet accessories in order for you to provide power safely and securely.Ī double gang cover can offer critical protection from the elements for an outdoor outlet, for instance. If you're taking on your own wiring project, you need components that can handle that wiring safely, without damaging your home. ![]()
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