Article 314 2008 Flashcards
Nonmetallic boxes can be used with
Nonmetallic cables, nonmetallic raceways, flexible cords
314
Outlet, Device Pull, and Junction Boxes, Conduit Bodies; Fittings and handholes.
314.3 Nonmetallic Boxes.
Nonmetallic boxes shall be permitted only with oopen wiring on sinsulators, concealed knob-and-tube wiring, cabled wiring methods with entirely nonmetallic sheaths, flexible cords, and nonmetallic raceways.
Metal boxes shall be _____ in accordance with Article 250.
Metal boxes shall be grounded and bonded
314
Outlet, Device Pull, and Junction Boxes, Conduit Bodies; Fittings and handholes.
314.4 Metal Boxes.
Metal boxes shall be grounded and bonded in accordance to Article 250
Short-radius conduit bodies such as capped elbows, and service-entrance elbows that enclose conductors 6 AWG and smaller shall not contain ____, ____, _____.
Splices, Taps, Devices
314
Outlet, Device Pull, and Junction Boxes, Conduit Bodies; Fittings and handholes.
314.5 Short-Radius Conduit Boxes.
….6 AWG or smaller, and aer only intended to enable the installation of the raceway and the contained conductors, shall not contain splices, taps, or devices and shall be of sufficient size to provide free space for all conductors enclosed in the conduit body.
True or false.
Boxes, conduit bodies, and fittings installed in wet locations shall be required to be listed for use in wet locations.
True
314
Outlet, Device Pull, and Junction Boxes, Conduit Bodies; Fittings and handholes.
314.15 Damp and Wet Locations.
In damp or wet locations, boxes, conduit bodies, and fittings shall be placed or equipped so as to prevent moisture from or accumilating within the box, conduit body, or fitting. Boxes, conduit bodies, and fitting installed in wet locations shal be listed for use in wet locations.
The total volume occupied by two internal cable clamps, six 12AWG conductors, and single pole switch is
12 AWG =2.25 cu. in. ( 6 x 2.25 = 13.5)
20.25 cubic inches
Device( 2 x 12 AWG cu. in.)= ( 2 x 2.25 = 4.5)
Clamp ( 1 x 12 AWG cu. in.)= ( 1 x 2.25 = 2.25)
13.5 + 4.5 + 2.25 = 20.25 cu. in.
According to the NEC, the volume of a 3 x 2 x 2 inch device box is _____.
10 cubic inches
314
Box Fill
Table 314.16(A)
Metal Boxes
3 x 2 x 2=10 cubic inches
When counting the number of conductors in a box, a conductor running through the box with an unbroken loop or coil not less than twice the minimum length required for free conductors shall be counted as _____ conductor(s).
2 conductors
314 Box Fill
- 16(B)(1)
- 16
Number of conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies
(B) Box Fill Calculations
(1) Conductor Fill
Each conductor that originates outside the box and terminates or is spliced within the box shall be counted as once, and each conductor that passes through the box without a splice or termination shall be counted as once. Each loop or coil of unbrokend conductor not less than twice the minumum length required for free conductors in 300.14 shall be counted twice.
Equipment grounding conductor(s) and not more than ______fixture wires smaller than 14 AWG can be omitted from the calculations where they enter the box from a domed luminaire or similar canopy and terminate with that box.
not over 4 wires 14 awg or less
314
Box Fill
- 16(B)(1) exception
- 16
Number of Conductors in a Outlet, Device Box,and Junction Boxes, and Conduit Bodies.
(B) Box Fil Calculations
(1) Conductor Fill
Exception: An Equipment grounding conductor(s) not over four fixture wires smaller than 14 AWG, or both, shall be permitted to be omitted from the calculations where they enter a box from a domed luminaire or similar canopy and terminate within that box.
Where one or more internal cable clamps are present in the box a single volume allowance in accordance with Table 314.16(A) shal be made, based on the largest conductor present.
TRUE OR False
True.
314 Box Fill
- 16(B)(2)
- 16
Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Devices.
(B) Box Fill Calculations
(2) Clamp Fill.
Where one or more internal cable clamps, whter factory or field supplied, are present in the box, a single volume allowance in accordance with 314.16(B) shall be made based on the largest conductor present in the box. No allowance shall be required for a cable connector with its clamping mechanism outside the box.
Where luminaire or hickey is present in the box, a ___ volume allowance in accordance with Table 314.16(B) shall be made for each type of fitting, based on the largest conductor present in the box.
Single
314
Box Fill
- 16(B)(3)
- 16
Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies
(B) Box Fill Calculations
(3) Support Fitting Fill.
WHere one or more luminaire studs or hickeys are present in the box, a single volumer allowance in accordance with Table 314.16(B) shall be made for each type of fitting based on the largest conductor present in the box.
Each strap containing one or more devices shall count as a ____ volume allowance in accordance with Table 314.16 (B) based on the largest conductor connected to a device(s) or equipment supported by the strap.
Double
314
Box Fill.
- 16(B)(4)
- 16
Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies
(B) Box Fill Calculations
(4) Device or Equipment Fill.
For each yoke or strap containing on or more devices or equipment, a double volume allowance in accordance with Table 314.16(B) shall be made for each yoke or strap based on the largest conductor connected to a device(s) or equipment supported by that yoke or strap. A device or utilization equipment wider than a single 2 inch device box as described in the table 314.16(A) shall have double volume allowances provided for each gang required for mounting.
A device or utiliztion equipment wider than a single 2 inch device box shall have ____ volume allowances provided for each gang required for mounting.
Double
314
Box Fill.
- 16(B)(4)
- 16
Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies
(B) Box Fill Calculations
(4) Device or Equipment Fill.
For each yoke or strap containing on or more devices or equipment, a double volume allowance in accordance with Table 314.16(B) shall be made for each yoke or strap based on the largest conductor connected to a device(s) or equipment supported by that yoke or strap. A device or utilization equipment wider than a single 2 inch device box as described in the table 314.16(A) shall have double volume allowances provided for each gang required for mounting.
Where one or more equipment grounding conductors enter a box, a ____ volume allowance in accordance with Table 314.16(B) shall be made, based on the largest equipment grounding conductor.
Single
314
Box Fill.
- 16(B)(5)
- 16
Number of Conductors in Outlet, Device, and Junction Boxes, and Conduit Bodies
(B) Box Fill Calculations
(5) Equipment Grounding Conductor Fill.
Where one or more equipment grounding conductors or equipment bonding jumpers enter a box, a single volume allowance in accordance with Table 314.16(B) shall be made based on the largest equipment grounding conductor or equipment bonding jumper present in the box. Where an additional set of equipment grounding conductors, as permitted by 250.146(D), is present in the box, an additional volume allowance shall be based on the largest equipment grounding conductor in th additional set.
Conduit bodies that are durably and legibly marked by the manufacturer with their volume can contain spices, taps, or devices.
True or False
True
314
Box Fill
- 16(C)(2)
- 16 Number of Conductors in Outlet, Devices, and Pull Boxes, and Conduit Bodies
(C) Conduit Bodies.
(2) With Splice, Taps, or Devices.
Only those conduit bodies that are durably and legibly marked by the manufacturer with their volume shall be permitted ot contain splices, taps, or devices. The maximum number of conductors shall be calculated in accordance with 314.16(B). Conduit bodies shall be supported in a rigid and secure manner.
When type NM cable is usedc with nonmetallic boxes not larger than 2 1/4 x 4 inches, securing th cable to the box shall not be required if the cable is fastened withing ____ of the box.
8 inches
314
Box Fill
- 17(C) exception
- 17
Conductors Entering Boxes, Conduit Bodies, or Fittings.
(C) Nonmetallic Boxes and Conduit Bodies
Exception: Where Nonmetallic sheathed cable or multiconductor UF cable is used with single gang boxes not larger than a nominal size 2 1/4inches x 4 inches mounted in walls or ceilings, and where the cable is fastened within 8 inches of the box measured along the sheath andd where the sheath extends through a cable knockout not less than 1/4 inch securing the cable to the box shall not be required. Multiple cable entries shall be permitted in a single cable knockout opening.
In a noncombustible wall(s) or ceilings, the front edge of a box, plaster ring, extension ring, or listed extender employing a flush-type cover, shall be set back not more than ____ from the finished surface.
1/4 inch for noncombustible
(* combustible flush mounted)
314
Box Fill
314.20
In Wall or Ceiling.
In walls or ceiling with a surface of concrete, tile, gypsum, or other noncombustible material, boxes employing flush type cover or faceplate shall be installed so that the front edge of the box, plaster, ring, extension ring, or listed extender will not be set back of the finished surface more than 1/4 inch.
In walls and ceilings constructed of wood, or other combustible surface material, boxes, plaster rings, extension rings, or listed extenders shal be flush with the finished surface or project therefrom.
In walls constructed of wood or other combustible surface material, boxes, plater rings, extension rings, or listed extenders shall _____.
be flush with the surface
314
Box Fill
314.20
In Wall or Ceiling.
In walls or ceiling with a surface of concrete, tile, gypsum, or other noncombustible material, boxes employing flush type cover or faceplate shall be installed so that the front edge of the box, plaster, ring, extension ring, or listed extender will not be set back of the finished surface more than 1/4 inch.
In walls and ceilings constructed of wood, or other combustible surface material, boxes, plaster rings, extension rings, or listed extenders shal be flush with the finished surface or project therefrom.
