Once there, click on their link to free access to the 2017 NEC ® edition of NFPA 70. If the volume is not listed, measure the electrical box, and use. The volumes of standard boxes that are not marked with their volume shall be as given in Table 314.16(A). Additional wiring enclosure sections, like plaster rings, domed covers, or extension rings, should also be marked with the volume.
Plaster rings and domed coveres code#
See the actual NEC ® text at NFPA.ORG for the complete code section. 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). 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. Nonmetallic barriers that are not marked with their volume are considered to have a cubic inch volume of 1 inch.īelow is a preview of Article 314. Where used, the space provided by plaster rings, domed covers and extension rings that are marked with their volume in cubic inches is included. Metal barriers that are not marked with their volume are now considered to have a cubic inch volume of ½ inch. The volume of a wiring enclosure (box) shall be the total volume of the assembled sections, and, where used, the space provided by plaster rings, domed covers, extension rings, etc. the assembled 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). Electrical Device Box Covers, Rings, & Accessories Electrical Box Covers Weatherproof Box Covers Electrical Box Accessories Plaster Rings Extension Rings. Some barriers are already marked with their volume to indicate how much space they take up inside the box while other barriers are not. Partially protected external locations under canopies, marquees, roofed (open) porches, and similar sites are considered. Now, in the 2017 NEC, a divider or barrier inside a box must be counted since it takes up space inside the box. Section 314.16 provides rules on calculating box fill and includes an allowance for conductors, devices, internal cable clamps and support fittings but has never required a specific allowance for a fixed barrier installed inside the box. sections, and, where used, the space provided by plaster rings, domed covers, extension rings, etc., that are marked with their volume in cubic inches. Similar language for receptacles is found in 406.5(J). Section 404.8(B) states that a snap switch shall not be grouped or ganged in enclosures with other snap switches, receptacles, or similar devices, unless they are arranged so that the voltage between adjacent devices does not exceed 300 volts, or unless they are installed in enclosures equipped with identified, securely installed barriers between adjacent devices. Sometimes the code requires a barrier inside a junction or device box. Plaster (mud) Volume in boxes can be increased by using rings, domed covers, extension rings, or similar items.
Website by Lorn J.Code Change Summary: Code language was added to address box volume for a fixed barrier inside a box.
Selection will refresh the page with new results. Use a modern browser like Chrome, Edge, or Foxfire for best results. Electrical Box Covers and Accessories Plaster Rings Skip to content Skip to navigation menu. Any reliance you place on such information is strictly at your own risk. A) volume of the box B) size and number of raceways C) number of rings and the volume of. Q20: Box calculations for 4 AWG and larger conductors (under 600 volts) are performed based on the. A) plaster (mud) B) polymer C) hybrid D) drilled. Summary of NEC Table 314.6(A) Metal Boxes Box Trade Sizeĭisclaimer: The information contained on this website is for general information purposes only. Volume in boxes can be increased by using rings, domed covers, extension rings, or similar items. What is the LARGEST equipment grounding conductor in the box? How many EQUIPMENT GROUNDING conductors are in the box? How many "gangs" are required to mount device #10?ģ14.16(B)(5) Equipment Grounding Conductor Fill
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