RESIDENTIAL WIRING 21ST 1-4 CHAP QUESTIONS AND
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS
GUARANTEED PASS | LATEST EXAM UPDATE
1. What code sets the standard for electrical installation work in the United
States? - CORRECT ANSWERS-The NEC is the basic standard; local and state
codes are to be considered also.
What entity enforces the requirements set by the NEC? - CORRECT
ANSWERS-The local electrical inspection authority or Authority Having
Jurisdiction(AHJ)
Does the NEC provide minimum or maximum standards? - CORRECT
ANSWERS-minimum
What do the letters "UL" signify? - CORRECT ANSWERS-When shown on an
electrical product or in a certification mark, it means the product is Listed by
Underwriters Laboratories. It also means that the product met applicable safety
standards when it left the manufacturer's plant.
What section of the NEC states that all listed or labeled equipment shall be
installed or used in accordance with any instructions included in the listing or
labeling? - CORRECT ANSWERS-NEC 110.3(B)
When the word "shall" appears in an NEC reference, it means that it(must)(may)
be done. - CORRECT ANSWERS-Must
, What is the purpose of the NEC? What section can this statement be found in? -
CORRECT ANSWERS-The NEC states in 90.2(A) that "The purpose of this Code
is the practical safeguarding of persons and property from hazards arising from
the use of electricity."
Does compliance with the NEC always result in an electrical
installation that is adequate, safe, and efficient? Why? - CORRECT ANSWERS-
No. The NEC states in 90.2(B) that "This Code contains
provisions that are considered necessary for safety. Compliance and proper
maintenance results in an installation that is essentially free from hazard but not
necessarily efficient, convenient, or adequate for good service or future
expansion of electrical use."* Informational Note: Hazards often occur because
of overloading of wiring systems by methods or usage not in conformity with
this Code.
This occurs because initial wiring did not provide for increases in the use of
electricity. An initial adequate installation and reasonable provisions for system
changes will provide for future increases in the use of electricity.
Name two nationally recognized testing laboratories. - CORRECT ANSWERS-
Underwriters Laboratories (UL) and Intertek Testing Services
(ETL listing mark). There are other testing laboratories such as
Canadian Standards Association (CSA), Factory Mutual (FM), and others the
student might refer to that may be acceptable to the authority enforcing the
Code.
a. Do Underwriters Laboratories and the other recognized testing
laboratories "approve" products?
b. What do these testing laboratories do? - CORRECT ANSWERS-a. No.
Approval is up to the Authority Having Jurisdiction.
ANSWERS | VERIFIED AND WELL DETAILED ANSWERS
GUARANTEED PASS | LATEST EXAM UPDATE
1. What code sets the standard for electrical installation work in the United
States? - CORRECT ANSWERS-The NEC is the basic standard; local and state
codes are to be considered also.
What entity enforces the requirements set by the NEC? - CORRECT
ANSWERS-The local electrical inspection authority or Authority Having
Jurisdiction(AHJ)
Does the NEC provide minimum or maximum standards? - CORRECT
ANSWERS-minimum
What do the letters "UL" signify? - CORRECT ANSWERS-When shown on an
electrical product or in a certification mark, it means the product is Listed by
Underwriters Laboratories. It also means that the product met applicable safety
standards when it left the manufacturer's plant.
What section of the NEC states that all listed or labeled equipment shall be
installed or used in accordance with any instructions included in the listing or
labeling? - CORRECT ANSWERS-NEC 110.3(B)
When the word "shall" appears in an NEC reference, it means that it(must)(may)
be done. - CORRECT ANSWERS-Must
, What is the purpose of the NEC? What section can this statement be found in? -
CORRECT ANSWERS-The NEC states in 90.2(A) that "The purpose of this Code
is the practical safeguarding of persons and property from hazards arising from
the use of electricity."
Does compliance with the NEC always result in an electrical
installation that is adequate, safe, and efficient? Why? - CORRECT ANSWERS-
No. The NEC states in 90.2(B) that "This Code contains
provisions that are considered necessary for safety. Compliance and proper
maintenance results in an installation that is essentially free from hazard but not
necessarily efficient, convenient, or adequate for good service or future
expansion of electrical use."* Informational Note: Hazards often occur because
of overloading of wiring systems by methods or usage not in conformity with
this Code.
This occurs because initial wiring did not provide for increases in the use of
electricity. An initial adequate installation and reasonable provisions for system
changes will provide for future increases in the use of electricity.
Name two nationally recognized testing laboratories. - CORRECT ANSWERS-
Underwriters Laboratories (UL) and Intertek Testing Services
(ETL listing mark). There are other testing laboratories such as
Canadian Standards Association (CSA), Factory Mutual (FM), and others the
student might refer to that may be acceptable to the authority enforcing the
Code.
a. Do Underwriters Laboratories and the other recognized testing
laboratories "approve" products?
b. What do these testing laboratories do? - CORRECT ANSWERS-a. No.
Approval is up to the Authority Having Jurisdiction.
