Article 314 2008 Flashcards Preview

NEC 2008 > Article 314 2008 > Flashcards

Flashcards in Article 314 2008 Deck (44):
1

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.

2

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

3

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.

4

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.

5

The total volume occupied by two internal cable clamps, six 12AWG conductors, and single pole switch is

20.25 cubic inches

#12 AWG =2.25 cu. in. ( 6 x 2.25 = 13.5)

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.

6

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

7

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

314.16(B)(1)

314.16 

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.

8

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

314.16(B)(1) exception

314.16

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.

9

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

314.16(B)(2)

314.16 

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.

 

10

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

314.16(B)(3)

314.16 

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.

11

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.

314.16(B)(4)

314.16

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.

 

12

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.

314.16(B)(4)

314.16

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.

13

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.

314.16(B)(5)

314.16

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.

14

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

314.16(C)(2)

314.16 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.

15

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

314.17(C) exception

314.17

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.

 

16

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.

17

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.

18

Plaster, drywall, or plasterboard surfaces that are broken or incomplete around boxes employing a flush-type cover or faceplate shall be repaired so there will be no gaps or open spaces larger than ____ at the edge of the box.

1/8 inch

314 

Box Fill

314.21

Repairing Plaster and Drywall or Plasterboard.

Plaster, drywall, or plasterboard that are broken or incomplete around boxes employing a flush-type cover or faceplate shall be repaired so there will be no gaps or open spaces greater than 1/8 inch at the edge of the box.

19

Surface extensions shall be made by mounting mechanically securing an extension ring over the box, unless otherwise permitted.

True     or     False

True

314

Box Fill

314.22 Surface Extensions.

Surface extensions shall be made by mounting and mechanically securing an extension ring over the box.

20

In completed installations, each outlet box shall have a _____.

Cover, faceplate, lampholder, or luminaire canopy

314

Box Fill

314.25 Covers and Canopies.

In completed installations,each box shall have a cover, faceplate, lampholder, or luminaire canopy, except where the installation complies with 410.24(B).

21

A _____ wiring method can be used for a surface extension from a cover, and the wiring methohd shall include an equipment grounding conductor.

Flexible wiring method

314 

Box Fill

314.22 Exception

314.22

Surface Extensions.

Exception: A surface extension shall be permitted to be made from the cover of a box where the cover is designed so it is unlikely to fall off or be removed if it securing means becomes loose. The wiring method shall be flexible for a length sufficient to permit removal of the cover and provide access to the box interior, and arranged so that any grounding continuity is independent of the connections btween the box and cover.

22

Surface-mounted enclosures shall be ____. 

Rigid and securely fastened in place.

314 

Box Fill

314.23(A)

314.23 Supports

(A) Surface Mounting.

An enclosure mounted on a building or other surface shall be rigidly and securely fastened in place. If the surface does not provide rigid and secure support, additional support in accordance with other provisions of this section shall be provided.

23

____ can be used to fasten boxes to structual members of a building using brackets on the outside of the enclosure.

Nails and Screws

314

Box Fill 

314.23(B)(1)

314.23 Supports

(B) Structual Mounting

(1) Nails and Screws.

Nails and Screws, where used as a fastening means,shall be attached by using brackets on the outside of the enclosure, or they shall pass through the interior withing 1/4 inch of the back or ends of the enclosure. Screws shall not be permitted to pass through the box unless exposed threads in the box are protected using approved means to avoid abrasion of conductor insulation.

24

A wood brace used for supporting a box for structual mounting shall have a cross-section not less than nominal _____.

1 inch x 2 inch

314 

Box Fill

314.23(A)(2)

314.23 Supports

(A) Surface Mounting

(2) Braces. 

Metal braces shall be protected against corrosion and formed from metal that is not less than .02 inches thick uncoated. Wood braces shall have a cross section not less than 1 in x 2 in.  Wood braces in wet locations

25

When mounting an enclosure in a finished surface, the enclosure shall be ____ secured to the surface by clamps, anchors, or fittings identified for the application.

Rigidly secured 

314 

Box Fill

314.23(C)

314.23 Supports.

(C) Mounting on Finished Surfaces.

An enclosure mounted in a finished surface shall be rigidly secured thereto by clamps, anchors, or fittings identified for the application.

26

Outlet boxes can be secured to suspened-ceiling framing members by mechanincal means such as _____, or by other means identified for the suspened-ceiling framing members.

bolts, screws, and rivets

314

Box Fill

314.23(D)(1)

314.23 Supports

(D) Suspended Ceilings

(1) Framing Members.

An enclosure shall be fastened to the framing members by mechanical means such as bolts, screws, or rivets, or by the use of clips or others securing means identified for use with the type of ceiling framing member(s) and enclosure(s) employed.  The framing members shall be adequately supported and securely fastened to each other and the building structure.

 

27

Enclosures not over 100 cubic inches having threaded enteries and not containing a device shall be considered to be adequately supported where _____ or more conduits are threaded wrenchtight ainot the enclosure and each conduit is secured within 3 Ft of the enclosure.

2 or more conduits

314 

Box Fill

314.23(E)

314.23 Supports.

(E) Raceway Supported Enclosure, Without DEvices, Luminaires, or Lampholders.

An enclosure that does not contain a device(s) other than splicing devices or support a luminaire(s), lampholder, or other equipment and is supported by entering raceways shall not exceed 100 cubic inches in size. It shall have threaded entires or have hubs identified for the purpose. It shall be supported by two or more conduits threaded wrenchtight into the enclosure or hubs. Each conduit shall be secured within 3 feet of the enclosure, or within 18 inches of the enclosure if all conduit enteries are on the same side.

28

Two intermediate metal or ridged metal conduits threaded wrenchtight into the enclosure can be used to support an outlet box containing devices or luminaires, if each raceway is supported within _____ of the box.

18 inches

314 

Box Fill 

314.23(F)

314.23 Supports.

(F) Raceway- Supported Enclosures, with Devices, Luminaires, or Lampholders.

An enclosure that contains a device(s), other than splicing devices, or supports a luminaire(s), lampholder, or other equipment and is supported by entering raceways shall not exceed 100 cubic inches

in size. It shall have threaded enteries or have hubs identified for the purpose. It shall be supported by two or more conduits threaded wrenchtight into the enclosure or hubs. Each conduit shall be secured within 18 inches of the enclosure.

29

Boxes can be supported from a mulitconductor cord or cable, provided the conductors are protected from ______.

Strain

314 Box Fill 

314.23(I)

314.23 Supports

(I) Flexible Cord. 

A box shall be supported from a multiconductor cord or cable in an approved manner that protects the conductors against strain, such as strain relief connector threaded into a box with a hub.

30

Boxes used at luminaire or lampholder outlets in a ceiling shall be designed for the purpose and shall be required to support a luminaire weighing a minimum of _____.

50 Lbs.

314

Box Fill 

314.27(A)

314.27 Outlet Boxes.

(A) Boxes at Luminaire Outlets.

Boxes used as luminaire or lampholder outlets in a ceiling shall be designed  for the purpose and shall be required to support a luminaire weighing a minimum of 50 lbs. Boxes used at a luminaire or lampholder outlets in a wall shall be designed for the purpose and shall be marked on the interior of the box to indicate the maximum weight of the luminaire that is permitted to be supported by the box in the wall, if other than 50 Lbs. At every outlet used exclusively for lighting, the box shall be designed or installed so that a luminaire may be attached. 

31

A wall-mounted luminaire weighing not more than _____ can be supported to a device box with no fewer than two No. 6 screws.

6 Lbs.

314

6 Lbs

Box Fill

314.27 Exception

314.27 Outlet Boxes.

Exception: A wall-mounted luminaire weighing not more than 6 Lbs. shall be permitted to be supported on other boxes or plaster rings that are secured to other boxes, provided the luminaire or its supporting yoke is secured to the box with no fewer than two NO. 6 or larger screws. (6/32 or larger)

 

32

A luminaire that weighs more than ____ can be supported by an outlet box that is listed and marked for the weight of the luminaire.

50 Lbs. 

314 

Box Fill

314.27(B)

314.27 Outlet Boxes.

(B) Maximum Luminaire Weight. 

Outlet boxes or fittings designed for the support of luminaires and installed as required by 314.23 shall be permitted to support a luminaire weighing 50 Lbs. or less. A luminaire that weighs more than 50 Lbs. shall be supported independently of the outlet box unless the outlet box is listed and marked for the maximum weight to be supported.

33

Floor boxes shall be ____ specifically for this purpose.

Listed specifically

314

Box Fill

314.27(C)

314.27 Outle Boxes

(C) Floor Boxes

Boxes listed specifically for this application shall be used for receptacles located in the floor.

34

Listed outlet boxes to support ceililng- suspended fans that weigh more than ____ lb shall have their allowable weight marked on the box. 

35 lbs.

314 

Box Fill

314.27(D)

314.27 Outlet boxes

(D) Boxes at Ceiling- Suspended (paddle) Fan Outlets.

Outlet boxes or outlet box systems used as the sole support of a ceiling-suspended (paddle) fan shall be listed, shall be marked by their manufacturer as suitable for this purpose, and shall not support ceiling- suspended (paddle) fans that weigh more than (70 lb). For outlet boxes or outlet box systems designed to support ceiling-suspended (paddle) fans that weigh more than 35 lb, the require marking shall include the maximum weight to be supported.

35

Equipment weighing less than 6 lb can be supported to any box or plaster ring secured to a box, provided the equipment is secured with at least two ____ or larger screws.

No. 6 screw or larger

314

Box Fill

314.27(E) exception

314.27 Outlet boxes 

(E) Utilization Equipment.

Exception: Utilization equipment weighing not more than 6 lb. shall be permitted to be supported on other boxes or plaster rings that are secured to other boxes, provided the equipment or its supporting yoke is secured to the box with no fewer that two No.6 or larger screws.

36

In staight pulls, the length of the box shall not be less than ___ times the trade size of the larges raceway

8 times (8 is straight)

314 

Box Fill

314.28(A)(1)

314.28 Pull and Junction Boxes and Conduit Bodies.

(A) Minimum Size. 

(1) Straight Pulls.

In staight pulls the length of the box shall not be less than eight (8) times the trade size of the larges raceway.

37

Where angle or U pulls are made , the distance between each raceway entry inside the box and the opposite wall of the box shall not be less than ____ times the trade size of the larges raceway in a row.

Six Times 

314

Box Fill 

314.28(A)(2)

314.28

Pull and Junction Boxes and Conduit Boxes. 

(A) Minimum Size

(2) Angle or U Pulls, or Splices. 

Where splices or where angle or U pulls are made, the distance between each raceway entry inside the box and the opposite wall of the box shall not be less than six times the trade size of the largest raceway. This distance shall be increased for additional entries by the amount  of the sum of the diameter of all other raceway entries in the same row on the same wall of the box. Each row shall be calculated individually, and the single row that provides the maximum distance shall be used.

38

Pull boxes or junction boxes with any dimension over ____ shall have all conductors cabled or racked in an approved manner.

Boxes over 6 feet

314 
Box Fill 

314.28(B)

314.28

Pull and Junciton Boxes, and Conduit Bodies

(B) Conductors in Pull or Junction Boxes.

In pull boxes or junction boxes having a dimension over 6 feet all conductors shall be cabled or racked up in an approved manner.

39

Listed boxes and handhole enclosures designed for underground installation can be directly buried when covered by _____, if their location is effectively identified and accesible.

gravel, light agrgate, non-cohesive granulated soil.

314 Box Fill

314.29 exception 

314.29

Boxes, Conduit Boxes, and Handhole Enclosures to Be Accesible

Exception: 

Listed boxes and handhole enclosures shall be permitted where covered by grave, light aggregate, or non-cohesive granulated soil if their location is effectively identified and accesible for excavation.

40

Handhole enclosures shall be designed and installed to withstand ______

all loads likely to be imposed.

314 

Box Fill

314.30 Handhole Enclosures.

Handhole enclosures shall be designed and installed to withstand all loads likely to be imposed to them.  They shall identified for use in underground systems.

41

Underground raceways and cable assemblies entering a handhole enclosure shall extend into the enclosure, but they are not required to be _____.

not required to be mechanically connected to handhole enclosure.

314

Box Fill

314.30 (B)

314.30 Handhole Enclosures

(B) Wiring Entries.

Underground raceways and cable assemblies entering a handhole enclosure shall extend into the enclosure, but they shall not be required to be mechanically connected to the enclosure.

 

42

Conductors, splices or terminations in a handhole enclosure shall be listed as ___.

suitable for wet locations

314

Box Fill

314.30(C)

314.30

Handhole Enclosures

(C) Enclosed Wiring.

All enclosed conductors and any splices or terminations, if present, shall be listed as suitable for wet locations.

43

Handhole enclosure covers shall have an identifying _____ that pominently identifies the function of the enclosure, such as "electric".

mark and logo

314 

Box Fill

314.30(D)

314.30

Handhole enclosures

(D) Covers.

Handhole enclosure covers shall have an identifying mark or logo that pominently identifies the function of the enclosure such as "electric". Handhole enclosure covers shall require the use of tools to open, or they shall weigh over 100 lbs. Metal covers and other exposed conductive surfaces shall be bonded in accordance with 250.96(A) if the conductors in the handhole are feeder or branch-circuit conductors.

44

Handhole enclosure covers shall require the use of tools to open, or they shall weigh over ____.

100 lb.

314 

Box Fill

314.30(D)

314.30

Handhole enclosures

(D) Covers.

Handhole enclosure covers shall have an identifying mark or logo that pominently identifies the function of the enclosure such as "electric". Handhole enclosure covers shall require the use of tools to open, or they shall weigh over 100 lbs. Metal covers and other exposed conductive surfaces shall be bonded in accordance with 250.96(A) if the conductors in the handhole are feeder or branch-circuit conductors.