Article 90 &
NEC Chapter 1
NEC Chapter 1
On a 480v delta transformer with the midpoint grounded the conductor with the higher volts to ground shall be ____________ in color.
What is Orange?
110.15
In damp or wet locations, surface-type cabinets shall be placed or equipped so as to prevent moisture from entering and accumulating within the cabinet, and shall be mounted so that there is at least _______” airspace between the enclosure and the wall.
What is 1/4 inch?
312.2
Wire installed in a conduit, located in a trench filled with concrete, are installed in a __________ location.
What is wet?
300.5(B)
There are __________W per Horsepower in a 100% efficient electric motor.
What is 746 Watts?
Theory
If multiple rod, pipe or plate electrodes are installed, they shall not be less than ______ ft apart.
What is 6 feet?
250.53(A)(3)
The dedicated equipment space of a 240V panelboard installed indoors is the width and depth of the equipment and extends to how many feet above the equipment?
What is 6 feet?
110.26(E)
_______ is the minimum vertical clearance needed for 240V overhead service conductors above a residential driveway?
What is 12 feet?
230.24(B)(2)
A USE cable feeds a 240/120V residential service shall be protected by an enclosure or raceway extending from the minimum cover distance below grade to a point at least ________’ above finished grade.
What is 8 feet?
300.5(D)(1), 230.32
______ is the full load current for a three phase 208V, 5H.P. wound rotor motor?
What is 16.7A?
T430.250
_______ is the minimum size equipment grounding conductor needed for equipment fed from a 40A breaker?
What is #10 AWG?
250.102(D) & T250.122
The required working space for access to live parts of equipment operating at 300 volts-to-ground, where there are exposed live parts on both sides of the workspace is ________ ft.
What is 4 feet?
T110.26(A)(1) condition 3
Type S fuses shall be classified at not over 125V for the following ampacity ranges _____.
What is 0-15A, 16-20A & 21-30A?
240.53(A)
______ is the minimum length between conduit entries required for a straight pull box that contains four #1/0 THW inside of a 2 ½” EMT?
What is 20 inches?
314.28 (2 ½” x 8 = 20”)
A transformer with no secondary protection has a primary rated at 480V at 14A. the primary overcurrent device can be sized no more than ________% of the rated primary current.
What is 125%?
T450.3(B)
When a ground ring is used as a grounding electrode, it shall be buried at a depth below the earth’s surface of not less than _________.
What is 30 inches?
250.53(F)
Conductor ampacity shall be determined using the _______ column of Table 310.16 for circuits rated 100A or less or marked for 14 AWG through 1 AWG conductors.
What is 60° Celsius?
110.14(C)(1)
__________ receptacles or more would be required for a dwelling unit living room wall measuring 30 feet in length?
What is three receptacles? (6'+12'+12')
210.52(A)(1)
______ is the de-rated ampacity of a #10 AWG THHN run in an ambient temperature of 110°F?
What is 34.8A?
(40x.87= 34.8A), T310.15(B)(2)(a) & T310.16
A single phase transformer has a turns ratio of 96:24. If the primary winding has a voltage of 24V applied and is drawing 3A of current, then how much current is on the secondary winding?
What is 12A?
Theory 96:24= 4:1, 24/4=6V, 24Vx3A=6Vx12A
A premises wiring system supplied by a grounded AC service shall have a grounding electrode conductor connected to the grounded service conductor at _______________.
What is "Each Service"?
250.24(A)
The working space in front of the electric equipment shall not be less than ______ in. wide, or the width of the equipment, whichever is greater.
What is 30 inches?
110.26(A)(2)
What is the minimum size service entrance conductor needed to feed a water heater rated at 120V, 5A?
What is #14 AWG?
230.79(A) & 230.42(B)
A minimum size of ______” EMT is required to hold four #12 AWG THHN, four #10 AWG THHN and four #8 AWG THHN
What is 1 inch?
Table 4 & 5 of Chapter 9
(4x .0133= .0532) + (4x .0211= .0844) + (4x .0366= .1464) = .284 sq. in. = 1”
If all terminals are rated for 75°C, the minimum size THW conductor is needed for a branch circuit supplying a 40 gallon water heater rated 240V at 22A is _____.
What is #10 AWG?
22A x 125%= 27.5A, 422.13, 310.15(B)(16)
__________ shall not be considered as an effective ground-fault current path.
What is the Earth?
250.4(A)(5)