Article 240-2008

Plug fuses of the Edison-base type shall have a maximum rating of_____. A) 2OA B) 30A C) 40A D) 50A

B) 30A

Plug fuses of the Edison-based type shall be used ________. A) Where overfusing is necessary B) As a replacement in existing installations C) As a replacement for Type S fuses D) 5OA and above

B) As a replacement in existing installations

Circuit breakers used to switch high- intensity discharge lighting circuits shall be listed and marked as_________ A) SWD B) HID C) A or B D) A and B

B) HID

Circuit breakers used to switch 120V or 277V fluorescent lighting circuit shall be listed and marked A) UL B) SWD or HID C) Amps D) VA

B) SWD or HID

A circuit breaker with a ______ voltage rating, such as 240V or 480V can be used where the nominal voltage between any two conductors does not exceed the circuit breakers voltage rating. A) Straight B) Slash C) High D) Low

B) Slash

Which the following is not standard size fuses or inverse time circuit breakers? A) 45A B) 70A C) 75A D) 80A

C) 75A

Outside feed tap conductors can be of unlimited length without over current protection at the point they receive their supply if A) The tap conductors are suitably protected from physical damage B) The tap conductors terminate at a single circuit breakers or a single set of fuses that limits the load to the ampacity of the conductors C) A and B D) None of these

C) A and B

Outside feeder tap conductors can be of unlimited length without overcurrent protection at the point they receive their supply if A) The conductors are suitably protected from physical damage B) The tap conductors terminate at a single circuit breaker or a single set of fuses that limits the load to the ampacity of the conductors C) A and B D) None of these

C) A and B

Flexible cords approved for and used with a specific listed Appliance or Luminaire shall be considered to be protected by the branch circuit overcurrent device when... A) Not more than 6 ft in length B) 20 AWG and larger C) Applied within the listing requirements D) 16 AWG and larger

C) Applied within the listing requirements

An 800A fuse rated a6 600v _______ on a 250V system. A) Shall be not be used B) Shall be used C) Can be used D) none of these

C) Can be used

Circuit breakers shall be capable of being closed and opened by manual operation. Operation by other means, such as electrical or pneumatic, shall be permitted if means for _____ operation is also provided. A) Automated B) Timed C) Manuel D) Shunt trip

C) Manuel

Type ____ fuse adapters shall be designed so that once inserted in a fuse holder that cannot be removed. A) A B) E C) S D) P

C) S

The maximum length of a feeder tap conductor in a high bay manufacturing building over 25 ft. high-bay manufacturing building over 35 ft high shall be A) 15 ft B) 20 ft C) 50 ft D) 100 ft

D) 100 ft

Overcurrent devices shall be readily accesible and installed so the center of the grip of the operating handle of the switch or circuit breaker, when in its highest position, is not more than ________ above the floor or working platform. A) 2ft B) 4 ft 6 in C) 5 ft D) 6 ft 7 in

D) 6 ft 7 in

Cartridge fuses and fuseholders shall be classified according to _________ ranges. A) Voltage B) Amperage C) A or B D) A and B

D) A and B

Which of the following is true about Type S fuses A) Adapters fit Edison base fuse holders B) Adapters are designed to be easily removed C) Type S fuses shall be classified as not over 125 V and 30 amps D) A and C

D) A and C

Overcurrent devices shall not be located _______ A) Where exposed to physical damage B) Near easily ignitable materials, such as clothes closet C) In a bathroom of dwelling units D) All of these

D) All of these

Overcurrent protection shall not exceed A) 15A for 14 AWG copper B) 20A for 12 AWG copper C) 30A for 10 AWG copper D) All of these

D) All of these

Circuit breakers shall _______ all ungrounded conductors of the circuit A) Open B) Close C) Isolate D) Inhibit

A) Open

The standard amp ratings for fuses includes... A)1 amp B) 6 amps C) 601 amps. D) All of these

D) All of these

Ground fault protection of equipment shall be provided for solidly Grounded Wye electrical systems of more than 150 volts to ground, but not exceeding 1000v phase to phase for each individual device used as a building or structure mean disconnecting means rated _____ or more. A) 1,000A B) 1,500A C) 2,000A D) 2,500A

A) 1,000A

Circuit breakers having an interrupting current rating of other than ______ shall have their interrupting rating marked on the circuit breaker. A) 5000A B) 10,000A C) 22,000A D) 50,000A

A) 5000A

If the circuit overcurrent device exceeds ________, the conductor ampacity must have a rating not less than the rating of the overcurrent device A) 800A B) 1,000A C) 1,200A D) 2,000A

A) 800A

Conductor overload protection shall not be required where the interruption of the _____ would create a hazard, such as in Material Handling magnet circuit or fire pump circuit. However, short circuit protection is required. A) Circuit B) Line C) Phase D) System

A) Circuit

Over-current protection for conductors and equipment is designed to ________ open the circuit. if the current reaches a value that will cause an excessive or dangerous temperature in conductors or conductor insulation. A) Open B) Close C) Monitor D) Record

A) Open

A circuit breaker with a _______ voltage rating, such as 240V or 480V, can be used where the nominal voltage between any two conductors does not exceed the circuit breaker's voltage rating. A) Straight B) Slash C) High D) Low

A) Straight

Conductors supplied under the tap rules are allowed to supply another conductor using the tap rules. A) True B) False

A) True

Single-pole breakers with identified handle ties can be used to protect each ungrounded conductor for line-to-line connected loads. A) True B) False

A) True

Supplementary overcurrent devices used in luminaries or appliances are not required to be readily accessible. A) True B) False

A) True

Enclosure for overcurrent devices shall be mounted in a ________ position unless impracticable. A) Vertical B) Horizontal C) Knife switches D) Transformers

A) Vertical

Supplementary overcorrect protection A) Shall not be used in luminaires B) May be used substitute for a branch-circuit-over current device C) May be used to protect internal circuits of equipment D) Shall be readily accessible

C) May be used to protect internal circuits of equipment

Overcurrent devices shall be A) Accessible (as if applied to wiring methods) B) Accessible ( as applied to equipment) C) Readily accessible D) Inaccessible to unauthorized personnel

C) Readily accessible

Flexible cords used in listed extension cord shall be considered protected against overcurrent when used within/(in)_____________. A) Indoor installations B) Unclassified locations C) The extension cord's listing requirements D) 50 ft of the branch circuit panelboard.

C) The extension cord's listing requirements

A device that, when interrupting currents in its current limiting range, reduces the current flowing in the faulted circuit to a magnitude substantially less than that obtainable in the same circuit if the device were replaced with a solid conductor having comparable impedance, is a(n) "_____ protective device." A) Short-circuit B) Overload C) Ground fault D) Current limiting

D) Current limiting

Fuseholders for cartridge fuses shall be so designed that it is difficult to put a fuse of any given class into a fuseholder that is designed for a ____lower or a______higher than that of the class to which the fuse belongs. A) Voltage, wattage B) Wattage, voltage C) Voltage, current D) Current, voltage

D) Current, voltage

__________ shall not be located over the steps a stairway. A) Disconnect switches B) Overcurrent devices C) Knife switches D) Transformers

D) Transformers