Chapter 1 General Requirement
The authority having jurisdiction will uses section ________ in the NEC as a basis to approve the materials and electrical equipment that are installed in a one- and two-family dwelling electrical system.
110.2
Precaution needs to be exercised when installing more then ______ Type NM cables through the same opening in wood framing members.
2
Generally, the overcurrent protection shall not exceed ______ amperes for a 12 AWG copper conductor after any correction factors for ambient temperature and for number on conductors have been applied.
20
Which of the following is the maximum ampacity for three 12 AWG Type THWN aluminum conductors installed in a raceway?
20 amps
Ampacity correction factors are required to be applied where the ambient temperature exceeds:
30 degrees C (86 degrees F)
(16The allowable ampacities of NEC Table 310.15 (B)(16) of IRC Table E3705.1 are determined at an ambient temperature of:
30 degrees C and 86 degrees F
The maximum ampacity for each of three single insulated 75 degrees C rated 6 AWG Type THWN copper conductors in a raceway is:
5 amps
Three 12-3 Type NM-B (with ground) cables and two 10-3 Type NM-B (with ground) cables are bundled longer than 600mm (24in) without maintaining spacing. All but the equipment grounding conductors are considered to be current-carrying. Which of the following adjustments factors must be applied?
50 percent
A metal cabinets or enclosures installed in a damp or wet location must be installed so there is at least ______ airspace between the enclosure and the wall or other supporting surface.
6-mm (1/4-in)
In comparing the following sizes of conductors, the ______ AWG is the smallest of the group.
8
Conductors with Type THW insulation that installed in an ambient temperature of 106 degrees F must have a correction factor _____ percent applied.
82
Type XHHW-2 conductors in a dry location have a maximum insulation temperature rating of:
90 degrees C
Terminals for more than one conductor and terminals used to connect ____________ shall be so identified.
Aluminum
Type THHN 8 AWG copper conductors are permitted to be installed in:
Ambient temperatures at 90 degrees C, 194 degrees F
Which of the following statements about integrity of electrical equipment and connection is false?
Cleaners or abrasives may be used to remove paint overspray from panelboard busbars
"The unit of electrical current which will flow through one ohm under a pressure of one volt in one second" is described as a watt. True or False
False
14 AWG aluminum conductors are suitable for dwelling unit branch-circuits. True or False
False
Derating factors are applicable to conductors installed in raceway nipples shorter than 600mm (24 in)
False
The relationship between current, voltage, and resistance in an electrical circuit was discovered by George Simon Ohm in 1726. True or False
False
Splicing devices for underground cables are required to be covered with insulation equivalent that of the conductors or with an insulating device that is:
Identified and listed for such use
Ordinary locations defined in the NEC and IRC include all the following EXCEPT:
Moist Locations
Which of the following statements about enclosures is true?
Must be identified for use in the operating environment (such as wet or damp locations)
The ________ recogizes qualified electrical testing laboratories that perform electrical evaluations, testing, and certification of certain products to ensure that they meet the requirements of both the construction and general industry electrical standards.
Occupational Safety and Health Administration (OSHA)
Which of the following insulated conductors can be used in wet locations as recognized by the NEC?
THW
Which of the following statements about the general requirements for 1/0 AWG conductors is true?
They are permitted to be terminated at 75 degrees C ampacity
Which of the following statements about the general requirements for 6 AWG conductors is true?
They are required to be terminated at 60 degrees C ampacity
"The unit of measurement of the energy flowing in an electrical circuit at any given moment" is described as a watt. True or False
True
A premises wiring system begins at the service point and extends to the outlet and wiring from and including the power source to the outlets where there is no service point. True or False
True
The following equation is used to change watts to horsepower: hp=watts/746 746 watts= 1 hp True or False
True
The purpose of the NEC is the practical safeguarding of persons and property from hazards arising from the use of electricity. True or False
True
The term volt describes "the unit of electrical pressure that is required to force one ampere through a resistance of one ohm." True or False
True
The unit of electrical resistance described as "the resistance through which one volt will force one ampere" is called an ohm. True or False
True
Mechanical power is usually expressed in horsepower and electrical power in:
Watts
The determination of a damp, wet or dry location is typically the responsibility of the _____ using the definitions and listing and labeling by a third-party testing agency.
authority having jurisdiction
Unused opening, other than those intended for the operation of equipment, those intended for mounting purposes, or those permitted as part of the design for listed equipment shall be:
closed to afford protection substantially equivalent to the wall of the equipment
Type THWN copper conductors are permitted to be installed in:
dry and wet locations
A wire connector for securing an aluminum wire in combination with a copper or copper-clad aluminum conductor, where physical contact occurs between the wires of different metals, is limited to ________ only and marked "AL-CU"
dry locations
By special permission, the authority having jurisdiction may wave specific requirements in this code or permit alternative methods where it is as establishing and maintaining effective safety. This rule requires the AHJ to state in ______ that the code variation is authorized.
wet locations