Once there, click on their link to free access to the 2017 NEC ® edition of NFPA 70.
Volume of plaster ring code#
See the actual NEC ® text at NFPA.ORG for the complete code section. 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. Metal barriers that are not marked with their volume are now considered to have a cubic inch volume of ½ inch. Some barriers are already marked with their volume to indicate how much space they take up inside the box while other barriers are not. 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. Without knowing the mud ring volume, a 4-inch-square by 2-inch-deep box. Rectangle: Cylinder: Sphere: Height (inches)XWidth (inches) XDepth (inches) Volume (cubicinches)(3.14) Xradius(inches)2XDepth(inches)Volume (cubic inches)4/3 X(3.14)Xradius (inches) Volume (cubic inches) STEP 2 Lookup lbs needed of plaster and water. Volume of wet mortar 0.45 + (0.45 x (30/100)) 0.45 + 0.135 0.585 m³ Now, to find out the dry volume of mortar, add extra 25 of wet volume. Volume of mortar 10 7.7 2.3 m 3 Adding 10 wastage 2.3 + 2.3 × 10 2.53 m 3 Adding 25 for dry mortar weight (Dry mortar weight > wet mortar weight) Volume of dry mortar 2.53 + 2.53 × 25 3.16 m 3 approx 3.2 m 3 Now, Volume of cement 3.2 / 7 3 Volume of sand 3.2 0. Similar language for receptacles is found in 406.5(J). Every outlet box has a specific amount of space for conductors, devices, and. Wet Volume Plaster Length of wall x Height of wall x Thickness of Plaster 10m x 3m x 0.015m 0.45m³ For, filling up joints and for uneven surface, 30 more mortar is required. 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. Code Change Summary: Code language was added to address box volume for a fixed barrier inside a box.
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