By the Numbers
Where one or more lighting outlet(s) are installed for interior stairways, there shall be a listed wall mounted control device at each floor level and landing level that includes an entryway to control the lighting outlet(s) where the stairway between floor levels has _____ risers or more.
What is 6
This is the maximum number of #14 THHN copper conductors that will fit in a 3/8" flexible metal conduit.
What is 4? Annex table C.3
Pass or fail: A type AC cable in installed in the mortar joint of a block wall to a box where an outside outlet is installed.
Fail: 320.12(5)
Aluminum has this many electrons in the valance shell.
What is 3?
This is the size of the grounding electrode conductor for the ground rod of a 200A residential service.
What is #6?
For habitable spaces in a dwelling unit, a receptacle outlet shall be installed within _____’ of a doorway.
What is 6'
This is the maximum number of #6 XHHW conductors allowed in a 2" EMT conduit that is 23" in length.
What is 34?
What is the ambient temperature correction factor for a conductor in the 75 deg column at 135 deg F ambient temperature?
What is .58?
This is how total resistance is calculated in a series circuit.
What is adding them all together?
This is the required minimum working space around a panel in a dwelling unit.
What is 30" wide, 36" deep and 6'-6" high?
In a dwelling unit, receptacles shall be installed such that no point measured horizontally along the floor line of any wall space is more than _______’ from a receptacle outlet.
What is 6'
This is the maximum number of #14 XHHW copper conductors allowed in a 3/8" flexible metal conduit where the fitting is installed inside of the conduit.
What is 2? 348.22
A new inspector fails an inspection for not maintaining at least a 1-1/4" clearance from the edge of the 2X4 wall. The wall is done with EMT; is the inspector correct?
The inspector is incorrect for EMT. 300.4(A)(1)
If a group of lights are run more than three hours; what is the maximum number of 100W lights that can be installed on a 15A circuit?
What is 14?
If a raceway has 12 current carrying conductors, the ampacity of those conductors must be adjusted to this percentage of the conductor’s ampacity.
What is 50%?
Where the number of current carrying conductors exceeds _______ in a raceway or group of cables not maintaining spacing for a distance of more than 24” the ampacity of the conductors shall be reduced as shown in table 310.15(B)(3)(a).
What is 3?
This is the grounding conductor fill for a box with 4 #14-2 romex cables.
What is 2 Cu In
This is the size of the cold water ground for a 400A residential service.
What is 1/0? 250.66
This is the total circuit resistance for the following parallel resistances: 1-36 ohm, 1 - 2.5K ohm, 1 - 47 ohm and 1 - 300 ohm.
What is 18.94 ohms?
A 4 X 2-1/8” box has 3 - #12-2 and 2 - #14-2 Romex cables coming into the box; there are internal clamps, one GFI receptacle and one single pole switch(12 gauge terminated on the GFI and 14 guage terminated on the switch), the box has a drywall ring that is stamped 3.25 cu/in. Is the box large enough?
What is 30.3 + 3.25 cu in for the box for a total of 33.55 cu in. ? Wire volume = #12 -6, #14 -4, Ground - #12, Devices 2- #12 & 2 -#14, Clamps 1 -12. Wire 6 X 2.25 = 13.5, 4 X 2 = 8, 1 X 2.25 = 2.25, 2 X 2.25 = 4.5, 2 X 2 = 4, 1 X 2.25 = 2.25. Total wire volume = 34.5 Total box volume 33.55 The box is too small
What is the minimum number of 15A lighting branch circuits required for a 2450 sq ft dwelling unit?
What is 5?
What is the minimum size Liquidtight Flexible non-metallic conduit (LFNC-A) if it contains the following conductors: 12-#6 XHHW, 6-#10 Z, 6-#12 FEPB and 3-#2 RHH aluminum without outer covering.
#6 XHHW .0590 X 12 = .708
#10 Z .0191 X 6 = .1146
#12 FEPB .0137 X 6 = .0822
#2 RHH AL .1194 X 3 = .3582
Total Cu In for conductors = 1.263
What is 2" LFNC-A (1.337)?
This is the smallest copper conductor that can be installed for a 200A residential service.
What is #2/0 Copper? 310.15(B)(7)
This is the input current for a 35 KVA 480V three phase transformer.
What is 42A?
This is the ampacity of the conductors of 4 #12-2 type NM cables run together in an attic in direct contact with the insulation. All of the conductors are considered current carrying.
What is 20A?