Worksheets4_ok
Total questions: 12
Worksheet time: 6mins
An assembly of a fuse support with either a fuseholder, fuse carrier, or disconnecting
blade. The fuseholder or fuse carrier may include a conducting element (fuse link) or may
act as the disconnecting blade by the inclusion of a nonfusible member.
fuse cutout
fuse system
fuse holder
fuse link
Cable limiters or other current-limiting devices are applied ahead of the service
disconnecting means for the following reasons except for
Faulted cable(s) are all isolated.
Continuity of service is maximized even though one or more cables are faulted.
The possibility of severe equipment damage or burn down as a result of a fault
on the service conductors is reduced.
The current-limiting feature of cable limiters can be used to provide protection
against high short-circuit currents for services.
Systems such as emergency lighting, fire alarms, fire pumps, standby power, and
sprinkler alarms are permitted to be connected ahead of the normal service
disconnecting means only if such systems are provided with a
Separate disconnecting means and overcurrent protection
Ground fault circuit interrupter
Fuse cutout
Cable fault limiter
Which of the following is written in the code
The service overcurrent device will not protect the service conductors under
short-circuit or ground-fault conditions on the line side of the disconnect.
Protection against ground faults and short circuits is provided by the special
requirements for service conductor protection and the location of the conductors.
On multiwire circuits, two or three single-pole switches or circuit breakers that are
capable of individual operation are permitted as one protective device.
A circuit breaker or a fuse must be installed in series with each grounded
service conductor to provide overload protection only.
Power Loss Hazard. Conductor overload protection shall not be required where the
interruption of the circuit would create a hazard. The following are the types of materials
except for.
material-handling magnet circuit
fire pump circuit
ferromagnetic material
flyers
Devices Rated 800 Amperes or Less. The next higher standard overcurrent device rating
(above the ampacity of the conductors being protected) shall be permitted to be used,
provided all of the following conditions are met except for.
The conductors being protected are not part of a multioutlet branch circuit
supplying receptacles for cord-and-plug-connected portable loads.
Bundled circuit conductor.
The ampacity of the conductors does not correspond with the standard ampere
rating of a fuse or a circuit breaker without overload trip adjustments above its
rating (but that shall be permitted to have other trip or rating adjustments).
The next higher standard rating selected does not exceed 800 amperes.
Which of the following is incorrect with regards with the code
The overhead branch-circuit and feeder conductors shall not be installed beneath
openings through which materials may be moved, such as openings in farm and
commercial building
Where buildings exceed three stories or 15 m (50 ft) in height, overhead lines
shall be arranged, where practicable, so that a clear space (or zone) at least 1.8 m
(6 ft) wide will be left either adjacent to the buildings or beginning not over 2.5 m
(8 ft) from them to facilitate the raising of ladders when necessary for fire fighting
Conductors run above the top level of a window shall be permitted to be less than
the 900-mm
Overhead spans of open conductors and open multiconductor cables shall
have a vertical clearance of not greater than 2.5 m (8 ft) above the roof
surface
What is the minimum clearance of power conductor crossing through the railway?
5600 mm
8100 mm
4400 mm
4100 mm
Where the service drop is secured to the mast, a guy wire may be installed to
support the mast and provide adequate mechanical strength to support the service
drop. Communications conductors such as those for cable TV or telephone service
are _______to be attached to the service mast.
not permitted
permitted
required
isolated
Surge arresters installed on circuits of less than 1000 volts shall be _____ for the purpose
identified
approved
listed
grounded
At least _______ of free conductor, measured from the point in the box where it emerges
from its raceway or cable sheath, shall be left at each outlet, junction, and switch point for
splices or the connection of luminaires (fixtures) or devices.
150 mm
300 mm
75 mm
65 mm
A switch or circuit breaker in a wet location or outside of a building shall be enclosed in a
________enclosure or cabinet. Switches shall not be installed within wet locations in tub or
shower spaces unless installed as part of a listed tub or shower assembly.
waterproof
weatherproof
concealed
accesible
