Unit 12: General Practice Flashcards
Review complex calculations, assess mastery of core topics, and refine problem-solving techniques.
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
Where should cabinets housing branch-circuit overcurrent protective devices not be located?
- over uneven surfaces
- 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 _________.
two
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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 ampere rating of _________.
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, 480-volt, induction-type motor with a FLA rating of 61 amperes marked on the nameplate.
125 amperes
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
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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 _________.
an outlet
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 multi family condo has an 8 kW electric range in each dwelling unit.
27.52 kW
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 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 Code, 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.
3 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.
3 feet
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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, multi conductor 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 of over 1000 volts are located within a minimum distance of _________ from the exposed electrical conductors or equipment, the fences shall be bonded to the grounding electrode system with wire-type bonding jumpers.
16 feet
