Unit 12: General Practice Flashcards
Strengthen problem-solving strategies, review key formulas, and build confidence for exam readiness.
Fill in the blank:
All of the following wiring methods are permitted to be present in a ceiling space used as a return-air plenum EXCEPT ________.
PVC conduit
Fill in the blank:
Cabinets housing overcurrent protective devices shall not be located ________.
over steps of a stairway
Fill in the blank:
For the purpose of determining conductor fill in a device box, a three-way switch is counted as equal to ________ conductor(s), based on the largest conductor connected to the switch.
two
Fill in the blank:
A transformer vault is required to be provided with a door sill or curb with a height of not less than ________.
4 in.
Fill in the blank:
Single-phase, 125-volt, 15- and 20-ampere receptacle outlets installed in floors of dwelling units shall not be counted as part of the required number of receptacle outlets, if they are located more than ________ from the wall.
18 in.
Fill in the blank:
When exceptions are not applicable, where a feeder serves a continuous load of 240 amperes the overcurrent protection device protecting this circuit shall have a MINIMUM ampere rating of ________.
300 amperes
240 amperes x 125% = 300 amperes
Fill in the blank:
Grounding conductors and bonding jumpers shall not be connected by ________.
sheet metal screws
Determine the initial standard size time-delay fuses permitted for branch-circuit, short-circuit and ground-fault protection for a 50 hp, 3-phase, 460-volt, induction-type motor with a FLA rating of 61 amperes marked on the nameplate. Hint: Use only one exception.
125 amperes
FLC of motor = 65 amperes x 175% = 113.75 amperes
The next standard size fuses with a rating of 125 amperes should be selected.
Fill in the blank:
Each commercial occupancy accessible to pedestrians shall be provided with at least one sign outlet supplied by a branch circuit rated at LEAST ________.
20 amperes
Fill in the blank:
The MAXIMUM number of size 14 AWG TW conductors permitted in a trade size 3/8 in. flexible metal conduit (FMC) with connector fittings on the outside of the FMC is ________.
four
3 - #14 TW + 1 #14 TW equipment grounding conductor = 4 - #14 TW
Fill in the blank:
Class 1 power-limited conductors of MINIMUM size ________ shall be permitted to be used, provided they supply loads that do not exceed the ampacities given in 402.5 and are installed in a raceway, an approved enclosure, or a listed cable.
18 AWG
Fill in the blank:
Luminaires mounted in the walls of a permanently installed swimming pool, shall be installed with the top of the luminaire lens not less than ________ below the normal water level of the pool, unless the luminaire is listed and identified for use at lesser depths
18 in.
Fill in the blank:
A point on a wiring system at which current is taken to supply fixtures, receptacles, lamps, luminaires, heaters, motors and other utilization equipment is considered a ________.
supply
Fill in the blank:
A ground ring consisting of a size 2 AWG bare copper conductor encircling the building or structure is permitted for use as a grounding electrode however, the conductor must have a length of 20 feet or more and be buried below the earth’s surface at a depth of not less than ________.
30 in.
Apply the optional method of calculations for dwelling units and determine the demand load, in kW, on the ungrounded (line) service entrance conductors where an eight (8) unit multifamily condo has an 8 kW electric range in each dwelling unit.
27.52 kW
8 kW x 8 units = 64 kW x 43% (demand factor) = 27.52 kW demand
Fill in the blank:
In the patient bed location in the general care (Category 2) spaces of a healthcare facility, each patient bed location shall be supplied by at least two (2) branch circuits, and the branch circuits shall not be a part of a ________.
multiwire branch circuit
Which type of flexible cord is permitted to be immersed in water to supply luminaires in a permanently installed fountain at an amusement park?
type SOW
Fill in the blank:
Extreme ________ may cause PVC conduit to become brittle, and therefore more susceptible to damage from physical contact.
cold
Fill in the blank:
According to the NEC®, if used to connect to equipment where flexibility is necessary after installation, trade size ¾ in. flexible metal conduit (FMC) will require additional support if the FMC exceeds ________ from the last point where the FMC is securely fastened.
8 feet
Fill in the blank:
In an aircraft maintenance or storage hangar, the area that extends upward from the floor to a level ________ above the surface of aircraft wings, power plants and fuel tanks shall be classified as a Class I, Division 2 or Zone 2 location.
10 feet
Fill in the blank:
For new installations in residential outdoor areas where permanently installed swimming pools are located, ceiling-suspended (paddle) fans installed above the pool or the area extending 5 feet horizontally from the inside walls of the pool, shall be installed at a height of not less than ________ above the maximum water level of the swimming pool.
12 feet
Fill in the blank:
For conductors of more than 1000 volts, multiconductor or multiplexed single-conductor cables having individual shielded conductors, the MINIMUM bending radius is ________ times the diameter of the individually shielded conductors or 7 times the overall diameter, whichever is greater.
12
Fill in the blank:
Where wire-type equipment grounding conductors are installed in parallel in multiple metallic raceways, they shall be sized in accordance with ________ of the NEC®.
Table 250.122
Fill in the blank:
Where chain-link metal fences are surrounding an electrical substation and located within a MINIMUM distance of ________ from the exposed electrical conductors or equipment, the fence shall be bonded to the grounding electrode system with wire-type bonding jumpers.
16 feet
