Code Book
Every ___ the National Electrical Code is revised.
What is every three years ?
The first step in planning a wiring project.
What is determining the load, as this influences all other decisions ?
An arc flash can produce temperatures of 35,000°F.
What is True ?
Susan insisted, "Ground wires are just decorative!" Now her metal lamp gives a friendly tingle when touched.
What is not grounding the metal lamp ?
The voltage values used throughout the text book for all calculations.
What is 120v and 240 v ?
NEC Table 220.14(J) states that the minimum load requirement for dwelling units is...
What is 3 volt-amperes per square foot ?
The required size of conductor for a 20-amp branch circuit.
What is #12 AWG ?
Aluminum wiring was commonly used in homes during the mid-1960s to early 1970s.
What is True ?
Dad thought one 15A circuit could handle the basement fridge, freezer, and space heater. The breaker trips every winter.
What is exceeding circuit ampacity per NEC 210.23 ?
You need to run five (5) 12 AWG THHN copper wires in EMT conduit. The minimum size EMT conduit required is...
What is 1/2 EMT conduit ?
- 0.0133 in2 per conductor
- 5 wires × 0.0133 in2 = 0.0665 in2
According to NEC 210.52(A)(1), the maximum distance that a receptacle outlet can be located from any point along a wall space in a dwelling unit is....
What is 6 ft?
GFCI outlets trip when they detect a current imbalance of this many milliamps.
Galvanic action occurs when two similar metals are in contact under dry conditions.
What is False ?
Handy Hank installed a standard outlet in his garage 18" off the floor. The inspector failed it for missing this feature.
What is GFCI protection per NEC 210.8(A)(2) ?
This size of copper conductor is required for a 50A, 240V circuit.
What is 6 AWG ?
- NEC Table 310.16
The minimum clearance required for LED drivers according to the NEC.
This device is required to protect 120V circuits from overcurrent and must match the wire gauge.
What is a circuit breaker ?
Gray insulation on a conductor can be used as an ungrounded "hot" conductor.
What is False ?
For his backyard shed, Carl used 135 feet of #12 wire on a 20A circuit. The LED lights glow like candlelight.
What is ignoring voltage drop per NEC 210.19(A) ?
The maximum number of 120V, 15A lighting circuits needed for a 2,400 sq. ft. dwelling.
What is 4 circuits ?
- 2,400 sq. ft. × 3 VA/sq. ft. = 7,200 VA
- 7,200 VA / 120V = 60A
- 60A / 15A = 4 circuits
The definition of a bathroom according to the NEC.
What is an area with a sink and one or more fixtures such as a toilet, shower, or tub ?
This material is unsuitable for push-in terminal connections.
What is stranded conductors ?
GFCI receptacles are designed to trip when the current imbalance reaches or exceeds 3-8 milliamperes.
What is False ?
Greg installed a 30A dryer outlet using 14 AWG wire "because it was cheaper." The melting smell started after 10 minutes.
What is undersized conductors for circuit ampacity per NEC 310.15 ?
Calculate the box fill for a switch box with four 12 AWG Romex, two clamps, and a dimmer.
What is 27 in3 // 4 11/16 x 1 1/2
- 8 conductors x 2.25 = 18 in3
- 4 grounds ( 1 x 2.25 ) = 2.25 in3
- 2 clamps ( 1 x 2.25 ) = 2.25 in3
- dimmer ( 2x 2.25 ) = 4.5 in3