STC EIT 260 Midterm
The smallest wire size for which overcurrent protection is specified in the Code is ____.
14 AWG NEC 210.24, Table 210.24, and 240.3(D)(3)
Specify the maximum overcurrent protection permitted for following the circuit conductor sizes: 14 AWG copper, 12 AWG copper, 10 AWG copper
15 amperes20 amperes30 amperes NEC 240.4(D)
The ampacity of Type NM cable shall be in accordance with ____ conductor temperature rating
60°C (140°F) NEC 334.80
A continuous load shall not exceed ____ of the rating of the branch circuit
80%
What are the two different types of ground-fault protection recognized by the Code?
The two types are ground-fault circuit-interrupter (GFCI) protection for personnel and ground-fault protection for equipment. NEC 590.6(A)(1)
Match the following switch types with their drawing symbols "S3"
Three-way
When an existing two-wire, non-grounding-type receptacle is replaced in a location where the Code requires a GFCI receptacle, it is permitted to be replaced by a ____.
two-wire, non-grounding-type receptacle NEC 406.4(D)(2)
The NEC requires that switching be done only in ____ conductors.
ungrounded NEC 404.2(A)
To avoid inductive heating in metallic raceways, the NEC requires that ____.
all circuit conductors be run in the same raceway NEC 300.3(B)
In order that the connections inside an outlet box remain accessible, the NEC requires that a surface extension from an outlet box cover be made using ____.
flexible conduit NEC 314.22 Exception
The purpose of electrical symbols on plans is ____.
to graphically represent electrical products and systems
Any receptacle installed to serve countertop surfaces and located within ____________________ of a wet bar sink must be GFCI protected.
6 ft NEC 210.8(A)(7)
Wall receptacles in a habitable room must be placed so they are no further than ____ feet from any point along the wall.
6 ft. NEC 210.52(A)(1)
Name the kitchen receptacles that are not required to be protected by ground-fault circuit-interrupters.
The receptacles include those located behind a refrigerator, serving a gas range, or under a sink serving a food waste disposer. NEC 210.8(A)(6)
Devices are equipment whose primary function is to carry current, not ____.
utilize electric energy Article 100 Def.
In walls or ceilings constructed of noncombustible material, what is the set back?
¼"
Article 210 applies to branch circuits, but branch-circuit calculations are covered in ____.
Article 220
Where noncombustible surface material is used on walls or ceilings, outlet boxes must be mounted so that they will be set back not more than ____ from the face of the surface material.
1/4 in. NEC 314.20
Class A GFCI devices trip (open) when a ground-fault in the range of ____ milliamperes occurs.
4 to 6
The total rating of utilization equipment fastened in place, other than luminaires (lighting fixtures), shall not exceed ____ percent of the branch-circuit ampere rating, where lighting units, cord and plug connected utilization equipment not fastened in place, or both, are also supplied
50% NEC 210.23(A)(2)
When is a re-identified white conductor is not permitted to be used?
A re-identified white conductor is not permitted to be used if the return conductor from the switch to the switched outlet.
How is an outlet defined by the NEC?
An outlet is a point on a wiring system where current is taken to supply utilization equipment Article 100 Def.
Phase conductors 6 AWG and smaller ____ permitted to be re-identified as equipment ground conductors using green paint, tape, or other effective means.
Are Not NEC 210.5(B), NEC 250.119 and NEC 310.110(B)
The Code indicates the rooms in a dwelling that are required to have switched lighting outlets or switched receptacles. Write yes (switch required) or no (switch not required) for the following areas [see NEC 210.70(A)]:
Attic(Yes), stairway (yes), crawl space (where used for storage) (yes), hallway (yes), bathroom (yes), clothes closet (no) NEC 210.70(A)
Why were immersion detection circuit interrupters (IDCIs) and appliance leakage current interrupters (ALCIs) introduced in older homes?
Because older homes probably do not have GFCI receptacles in bathrooms, immersion detection circuit interrupters (IDCIs) and appliance leakage current interrupters (ALCIs) were introduced to provide people with shock protection. NEC 422.41 NEC 215.10 and 517.17
The use of the word shall indicates a(n) ____________________ rule.
Mandatory NEC 90.5(A)
Explain what is meant by a nominal voltage rating
Nominal means typical or in name only. Circuits are rated at a nominal 120 volts. However, the actual operating voltage may be 110V, 115V, or 117V. NEC 100 Def.
What is the NEC definition of a qualified person?
One who has skills and knowledge related to the construction and operation of the electrical equipment and installations and has received safety training to recognize and avoid the hazards involved. NEC 100 Def.
Nationally Recognized Testing Laboratories (NRTL) test and evaluate products for ____________________.
Safety
The National Electrical Code is a minimum ____ standard.
Safety
Match the following switch types with their drawing symbols "S"
Single-pole
____________________ provide additional information about a job that may not be found on the blueprints.
Specifications
The NEC requires that conductors 8 AWG and larger must be ____ when installed in a raceway.
Stranded NEC 310.106(C)
GFCI protection is not required for ____.
a built-in dishwasher NEC 210.8
The meaning of approved is ____.
acceptable to the authority having jurisdiction Article 100 Def.
AFCI protection must be provided for ____________________ branch circuits supplying outlets installed in dwelling unit bedrooms.
all 120-volt, single phase, 15- and 20-ampere NEC 210.12(A)
Under certain circumstances, the grounded (neutral) conductors of a residential service ____ permitted to be sized smaller than the phase conductors.
are NEC 215.2(A)(2) and NEC 230.42(C)
The NEC requires that a(n) ____ be installed at each conductor splice connection point.
box or conduit body NEC 300.15
Unused knockouts in boxes, spaces for ____________________ in a panel, meter socket enclosures, and all other similar equipment must be effectively closed.
circuit breakers NEC 110.12(A) & 408.7
Branch circuit conductors shall have an ampacity ____ the maximum to be served.
not less than NEC 210.19(A)
The rating of a branch circuit is determined by its ____.
overcurrent protective device (fuse or circuit-breaker)
As defined in Article 100, a dwelling unit has the following feature(s): ____.
permanent provisions for living, sleeping, cooking, and sanitation Article 100 Def.
When a conductor that is carrying current breaks or when a loose connection occurs, it is a ____________________ arcing fault because the current is trying to travel in its intended path.
series
All 125-volt, 15- and 20-ampere receptacles in a dwelling are required to be ____.
tamper resistant NEC 406.12
The NEC recommends a voltage drop no greater than ____________________ percent for feeders and no greater than ____________________ percent total for feeders and branch circuits together.
3% and 5% feeders NEC 210.19 Info Note 4
Name several factors that must be taken into account when sizing boxes per the NEC.
Factors include devices installed, circuit wires, hickeys and studs, clamps, and equipment grounding conductors.
What is the purpose of the National Electrical Code?
The purpose is the practical safeguarding of persons and property from hazards arising from the use of electricity.
The 20-ampere appliance circuits required by NEC are permitted to serve no other loads, except for
clock outlets and receptacles that are installed to plug in the cords of gas-fired ranges, ovens, or counter-mounted cooking units NEC 210.52(B)(2) Exception 1 and 2
When using individual conductors in raceway, all of the following colors of insulation are permitted for the grounded conductor (neutral), except for ____.
green with three white stripes NEC 200.7(A)
NEC Article 210 provides ____ guidelines for locating receptacle outlets in residences.
mandatory Article 210
Describe what NEC 250.148 requires to maintain the continuity of the equipment grounding path.
When more than one equipment grounding conductor enters a box, they shall be spliced so that the continuity of the grounding path is not interrupted if the receptacle or other wiring device is removed.
Table 310.15(B)(2)(a) gives allowable ampacities of copper conductors with various types of insulation. When conductors will be used in ambient temperatures exceeding 30°C (86°F), the ____ for the table must be applied.
correction factors
All of the following are included when calculating the usable area of a dwelling to compute the required lighting load, except for ____.
crawl space NEC 220.12
The authority having jurisdiction over electrical construction is generally the ____________________.
electrical inspector
The common point on a wye-connected polyphase system or the mid-point on a single phase system is the _________________________.
neutral point Article 100 Def.