Cabinets, Enclosures & Cutout Boxes (NEC 312/314)

Question 1: What is the minimum volume allowance required per a No 16 AWG conductor?

• 1.75 volume cu in
• 2.0 volume cu in
• 2.25 volume cu in
• 2.5 volume cu in

NEC Reference: NEC 316.14(B)

Question 2: A cabinet or enclosure cannot be used as a raceway.

• True
• False

NEC Reference: NEC 312.8

Question 3: Splices and taps can be installed in enclosures if they not fill more than ............... % of the white space with in the enclosure.

• 75
• 70
• 60
• 80

NEC Reference: NEC 312.8

Question 4: According to NEC, locknuts, bushings and internal cable clamps are not counted for box fill calculations.

• True
• False

NEC Reference: NEC 314.16(B)

Question 5: Which of the following conductors that will not be counted for box fill calculations?

• conductors that originate and terminate with in the box
• conductor loop less than 12-inch long
• conductor that terminates in a box

NEC Reference: NEC 314.16(B)(1)

Question 6: A junction box contains two receptacles, four 12 AWG conductors and two 12 AWG equipment grounding conductors. What is the total volume of conductors and devices in the box?

• 20.25 cu.in
• 22.50 cu.in
• 18 cu.in
• 24.75 cu.in

NEC Reference: NEC 314.16

Question 7: The remaining volume of outlet box is 14.40 cu.in. How many number of No 14 AWG conductors are permitted to use in the remaining volume?

• 4
• 5
• 6
• 7

NEC Reference: NEC 14.40

Question 8: How many No 10 AWG conductors can be sliced in 11 cu in conduit body?

• 2
• 3
• 4
• 5

NEC Reference: NEC 314.16(B)

Question 9: Which of the following systems a box must be installed at each termination point?

• lighting system
• communication system
• control conductors
• signaling conductors

Question 10: A 3 wire, single phase 120/240 volts circuit supplies 1000 W , 120 volts electric heater and 600 W, 120 volts electric dryer. What is the operating voltage of the heater?

• 90 volts
• 100 volts
• 120 volts
• 110 volts

NEC Reference: NEC 14.4