Deck 9: Services and Electrical Equipment

Question 1

The radius of the curve of the inner edge of any bend in service-entrance cable must be at least ____ times the diameter of the cable.

A) two
B) three
C) four
D) five

Answer 1

D

Question 2

Overhead service conductors, accessible only to pedestrian traffic, must have a minimum ____-ft vertical clearance above finished grade.

A) 6
B) 8
C) 10
D) 12

Answer 2

C

Question 3

Entrance cables must be supported within ____ in. of every raceway or enclosure connection.

A) 6
B) 12
C) 18
D) 24

Answer 3

B

Question 4

All switchboards, switchgear, panelboards, distribution boards, and motor control centers must be located ____ and must be protected from damage.

A) in dedicated spaces
B) along bearing walls
C) within crawl spaces
D) inside duct work

Question 5

Underground service conductors are defined as the underground conductors between the service point and the ____ to the service-entrance conductors in a terminal box.

A) first interior branch
B) first point of connection
C) primary junction
D) secondary branch

Question 6

Panelboards include overcurrent devices as well as ____.

A) appliance branches
B) buses
C) main box nuts
D) line splitters

Question 7

The ampere rating of any circuit breaker rated at ____ amperes or less, and 1000 volts or less, must be molded, stamped, etched, or similarly marked into the handle or escutcheon area.

A) 75
B) 100
C) 125
D) 150

Question 8

Circuit breakers and fuses can be connected in parallel provided they are ____.

A) rated at 100 amperes or less
B) installed along the main feeder line
C) rated at 100 amperes or more
D) factory assembled and listed as a unit

Question 9

Although not stipulated in the NEC, some local jurisdictions have adopted ____ for service conductors.

A) specific distance requirements
B) load capacities
C) insulation materials
D) waterproofing standards

Question 10

Type ____ cable can be formed in a gooseneck and taped with a self-sealing weather-resistant thermoplastic.

A) SL
B) ME
C) SE
D) WE

Question 11

Service-entrance and overhead service conductors shall be arranged so that ____.

A) lightening rods will extend above them
B) water shall not enter the service raceway or equipment
C) sealed service head is not exposed
D) the main body is supported by rigid masting

Question 12

Type USE cable used for service laterals can ___.

A) be contained in a raceway
B) be locally grounded
C) emerge aboveground at outside terminations
D) be indirectly buried

Question 13

Conductors must have a vertical clearance of at least ____ ft above the roof surface.

A) 2
B) 4
C) 6
D) 8

Question 14

Working space illumination shall not be ____.

A) controlled by a switch plate
B) applied via a branch circuit
C) controlled by automatic means only
D) located along a bearing wall

Question 15

Voltage between overhead conductors does not exceed ____ volts.

A) 100
B) 200
C) 300
D) 400

Question 16

Wireways are ____ with hinged or removable covers used to house and protect electric wires and cables.

A) service boxes
B) raceways
C) non-metallic sheaths
D) troughs (sheet metal or nonmetallic)

Question 17

Circuit breakers must have a voltage rating (clearly marked) ____ voltage.

A) no more than the nominal system
B) within a predetermined range
C) no less than a predetermined range
D) no less than the nominal system

Question 18

Concrete, brick, or tile walls are recognized as ____.

A) insulated
B) grounded
C) waterproof
D) defacto raceways

Question 19

Panelboards shall be mounted in cabinets, cutout boxes, or identified enclosures and shall be ____.

A) removable
B) drop down
C) dead front
D) metallic

Question 20

Two to ____ circuit breakers or sets of fuses are acceptable as the overcurrent device to provide overload protection.

A) three
B) four
C) six
D) eight

Question 21

A one-family dwelling service disconnecting means must have a minimum rating of ____.

A) 120 amperes, 4-wire
B) 100 amperes, 2-wire
C) 100 amperes, 3-wire
D) 120 amperes, 3-wire

Question 22

Fuseholders for current-limiting fuses must not ____.

A) allow water seepage
B) allow cross-over sparking
C) permit insertion of non-current-limiting fuses
D) permit rewiring

Question 23

Main bonding jumpers and system bonding jumpers must be made of ____ or other corrosion-resistant material.

A) aluminum
B) stainless steel
C) sheathed aluminum
D) copper

Question 24

Cartridge fuses and fuseholders are classified according to ____.

A) voltage and amperage ranges
B) ampere ranges and melt-down
C) wattage or heat capacity
D) voltage ranges

Question 25

Splices in wire-type grounding electrode conductors are acceptable only if by means of irreversible compression-type connectors (listed as grounding and bonding equipment) or by the ____.

A) endothermic welding process
B) exothermic welding process
C) cold fusion
D) hot spark technique

Question 26

Fuses must be plainly marked (by printing on or a label attached to the fuse barrel), showing the following: (1) ampere rating, (2) voltage rating, (3) ____, (4) "current-limiting" where applicable, and (5) the name or trademark of the manufacturer.

A) material capacity
B) interrupting rating if other than 10,000 amperes
C) date of manufacture
D) interrupting rating if other than 1,000 amperes

Question 27

Conductor sizes are expressed in American Wire Gage (AWG) or in ____.

A) circular mils
B) copper gauge units
C) diameter in inches
D) millimeters squared