Question 1

A structural ceiling may not ____.

Accepted Answer

A)   contain any wiring
B)   contain any lighting
C)   be a suspended or drop type
D)   contain ductwork C

Question 2

All mechanical elements used to terminate a grounding electrode conductor or bonding jumper to a grounding electrode shall be ____.

Accepted Answer

A)   painted
B)   waterproof
C)   accessible
D)   lubricated C

Question 3

According to the NEC , live parts of electric equipment operating at 50 to 1000 volts, nominal, shall be guarded against ____ by approved enclosures.

Accepted Answer

A)   water damage
B)   overvoltage
C)   accidental contact
D)   phase transformations C

Question 4

Overcurrent protection for transformers over ____ volts, nominal, is required.

Accepted Answer

A)   300
B)   500
C)   600
D)   1000

Question 5

Where ungrounded conductors are increased in size for any reason other than as required in 310.15(B) or 310.15(C), wire-type equipment grounding conductors (where installed) shall be increased in size ____, according to the circular mil area of the ungrounded conductors.

Accepted Answer

A)   proportionately
B)   inversely
C)   directly
D)   indirectly

Question 6

The alternating current phase arrangement on 3-phase busses are ____ from front to back, top to bottom, or left to right, as viewed from the front of the switchboard, switchgear, or panelboard.

Accepted Answer

A)   A, B, C
B)   C, B, A
C)   1, 2, 3
D)   3, 2, 1

Question 7

The ____ phase must be that phase having the higher voltage to ground on 3-phase, 4-wire, delta-connected systems.

Accepted Answer

A)   A
B)   B
C)   C
D)   D

Question 8

Premises wiring (system) is defined as ____, including power, lighting, control, and signal circuit wiring together with all their associated hardware, fittings, and wiring devices, both permanently and temporarily installed.

Accepted Answer

A)   interior and exterior wiring
B)   interior wiring
C)   exterior wiring
D)   main service wiring

Question 9

A system that supplies a ____ and is derived from a transformer rated no more than 1000 volt-amperes does not require a grounding electrode conductor.

Accepted Answer

A)   Class A, EE, AE circuit
B)   main branch circuit
C)   secondary circuit
D)   Class 1, 2, or 3 circuit

Question 10

Equipment rated ____ amperes (or more) and over 6 ft (1.8 m) wide requires an entrance to and egress from the required working space at least 24 in.(610 mm) wide and 6½ ft (2.0 m) high at each end of the working space.

Accepted Answer

A)   700
B)   1000
C)   1100
D)   1200

Question 11

Ground-fault protection that functions to open the service disconnect will afford no protection from faults on the ____ of the protective element.

Accepted Answer

A)   circuit side
B)   panel box side
C)   underside
D)   line side

Question 12

One access means to a working space is permitted where the location provides ____.

Accepted Answer

A)   a continuous and unobstructed exit
B)   adequate sprinkler coverage
C)   balcony exits
D)   adequate overhead clearance

Question 13

A(n) ____ minimum vertical clearance is required above finished grade for sidewalks, or from any platform or projection from which overhead conductors (of 150 volts, or less, to ground) might be reached.

Accepted Answer

A)   9-ft (2.7-m) 
B)   10-ft (3.0-m) 
C)   11-ft (3.3-m) 
D)   12-ft (3.7-m)

Question 14

The connection between the grounded circuit conductor (neutral) and the equipment grounding conductor at the service is the ____.

Accepted Answer

A)   main switching lead
B)   main bonding jumper
C)   central lead
D)   transverse bridge

Question 15

Vertical wiring clearances apply to ____.

Accepted Answer

A)   commercial services
B)   residential services
C)   all electrical feeder and service installations
D)   dwellings over six stories

Question 16

Live generator parts operating at more than ____ volts ac to ground shall not be exposed to accidental contact by unqualified persons.

Accepted Answer

A)   25
B)   50
C)   75
D)   100

Question 17

A ____ is a large single panel, frame, or assembly of panels with front- or rear-mounted switches, protective devices (overcurrent, etc.), buses, and, usually, instruments.

Accepted Answer

A)   panelboard
B)   switchboard
C)   circuit cabinet
D)   panel cabinet

Question 18

All panelboards shall have a rating not less than the ____ required for the load calculated in accordance with Part III, IV, or V of Article 220.

Accepted Answer

A)   minimum feeder capacity
B)   maximum feeder capacity
C)   50% of maximum feeder capacity
D)   50% of minimum feeder capacity

Question 19

The maximum rating for overcurrent protection on a primary unit is ____.

Accepted Answer

A)   125%
B)   250%
C)   300%
D)   350%

Question 20

Where rear access is required to work on nonelectrical parts at the back of enclosed equipment, a minimum working space of ____ horizontally is required.

Accepted Answer

A)   20 in.(508 mm) 
B)   30 in.(762 mm) 
C)   36 in.(914 mm) 
D)   40 in.(1 m)

Exam 14: Services Feeders and Equipment