NEC Chapter 5 Review questions
Cartridges fuses with no markings are rated for _____A.
10,000
Plug fuses have a voltage rating of _____V between conductors in most applications.
125
______ AWG and larger ungrounded conductors installed in a raceway that enters a box shall be protected by an identified insulating fitting.
4
Circuit breakers that are not marked have an interrupting rating of ______A.
5,000
The three basic classifications of insulation rating are 60C (140F), 75C (167F), and ________ C (194F).
90
Overcurrent protective devices are permitted to be installed in clothes closets if they are located at least 12" from combustible materials.
F
T or F. All conductors installed in electrical distribution systems shall be insulated.
F
T or F. Overcurrent devices are permitted in bathrooms.
F
T or F. The maximum standard rating for a fuse is 5000 A.
F
T or F. Type S fuses are designed for circuits no exceeding 100 V.
F
T or F. When used for equipment grounding purposes, only covered or insulated conductors are permitted.
F
A(n) ________ is a circuit breaker with an intentional delay between the time when the fault or overload is sensed and the time when the CB operates.
ITCB (inverse time)
T or F. Conductors used for direct burial shall be identified for such use.
T
________ conditions included installations where the conductors are exposed to oils, greases, vapors, etc. that break down the integrity of the conductors' insulation.
corrosive
Locations can be classified as either dry, ______ , or wet.
damp
A(n) _____ fuse is a plug fuse that incorporates a screw configuration that is interchangeable with fuses of other ampere ratings.
edison braised
Ampacity of feeder taps not over 25' shall not be less than 1/3 of the rating of the overcurrent protective device protecting the ______ conductors.
feeder
Equipment grounding conductors, in general when they are insulated, shall be provided with an outer finish that is ______ in color.
green
In general, insulated grounded conductors (neutral) sizes 6 AWG or smaller shall be identified with an outer finish that is white or _______.
grey
_______ is generated when current flows through a conductor.
heat
Plug fuses of 15 A and lower are identified by a(n) _____ configuration of the fuse window.
hexagonal
The next ________ standard size OCPD of 800 A or less is permitted to be used where the OCPD does not correspond to a standard size.
higher
No conductor shall be installed in such a manner that the operating temperature of its ______ is exceeded.
insulation
Insulated conductors installed in wet locations shall be of a type _____ for the use.
listed
A(n) ______ is any current in excess of that for which the conductor or equipment is rated.
over current
In general, fuses and circuit breakers shall not be connected in ______.
parallel
When conductors are run in parallel in separate raceways, the raceways shall have the same _____ characteristics.
physical or electrical
Circuit breakers used as switches for a 120 V fluorescent lighting circuit shall be listed and marked "SWD" or "HID".
T
T or F. Circuit breakers shall clearly indicate whether they are in the open or closed position.
T
T or F. Copper and aluminum conductors shall not be terminated in a manner that causes the dissimilar metals to come in direct contact with each other.
T
T or F. Flexible cords and cables shall be protected against overcurrent in accordance with their capacities.
T
T or F. Insulated conductors are the most common conductors installed in electrical systems.
T
T or F. Paralleled conductors shall all be the same length.
T
T or F. THW conductors are permitted to be installed in wet locations.
T
T or F. The least potentially damaging overcurrent occurs when there is an overload.
T
