CIW Chapter 8

Question 1

A grounding ___ is a metal component that contacts the earth and has a conductor connect to it.

Answer 1

electrode

Question 2

Panelboards in commercial and industrial facilities are often 480/277 V panel boards or ___ panel boards.

Answer 2

208/120 V

Question 3

Mechanical grounding connectors are typically composed of high- ___ alloy.

Answer 3

copper

Question 4

When installing service disconnects, they must be grouped together with no more than ___ in one location.

Answer 4

six

Question 5

A(n) ___ is an electrical conductor used to connect non-current carrying metal parts of equipment or enclosures to the system grounding conductor or grounding electrode.

Answer 5

equipment grounding conductor (EGC)

Question 6

Examples of separately derived systems include ___, solar photovoltaic systems, generators, and transformers.

Answer 6

batteries

Question 7

A(n) ___ is a device located over and around contacts to cool and extinguish an electrical arc when contacts open under load.

Answer 7

arc chute

Question 8

___ transformers isolate the power circuit from the control circuit, providing additional safety for the circuit operator.

Answer 8

Control

Question 9

If an EGC is larger than 6 AWG, ___-colored insulation is used

Answer 9

black

Question 10

A ___ point is the point at which utility conductors are connected to a facility wiring system.

Answer 10

service

Question 11

Transformer hum is the sound produced by the vibrations of the metal ___ of a transformer core.

Answer 11

laminations

Question 12

Typically, motors that operate above 100 V are expected to operate at 90% to ___% of their voltage rating.

Answer 12

110

Question 13

A ___ is an electrical device that switches and transforms incoming distribution voltages down to plant-distribution voltage levels.

Answer 13

unit substation

Question 14

A metering ___ is a group of electrical service meters in a facility.

Answer 14

system

Question 15

A(n) ___ washer is a round washer that is split, slightly bent, and installed between a nut and the surface of the workpiece.

Answer 15

lock

Question 16

A(n) ___ is a connection for electrical service equipment that ties together the equipment grounding conductor (EGC) and the grounding electrode conductor (GEC).

Answer 16

main bonding jumper (MBJ)

Question 17

Electrical insulation on most conductors used in systems rated at 480 V and below is rated for ___ V maximum.

Answer 17

600

Question 18

The AC energy transfer in a transformer is made magnetically through the ___.

Answer 18

iron core

Question 19

Bonding methods are used to protect personnel and equipment from ___.

Answer 19

ground-fault conditions

Question 20

As a distribution system operates, the ___ can vary due to loads cycling on and off.

Answer 20

voltage

Question 21

The NEC does not permit the use of conductors smaller than ___ AWG for copper for wiring in applications up to 2000 V.

Answer 21

14

Question 22

When electrical equipment is stored, temporary space heaters can be used to maintain a temperature that is ___.

Answer 22

10 degrees above ambient temperature

Question 23

A typical ___ combines individual control units into standard modular structures, which are joined together for convenience.

Answer 23

motor control center

Question 24

___ of transformers can be provided by covering, shielding, fencing, enclosing, or otherwise prohibiting approach or contact by persons or objects.

Answer 24

Physical protection

Question 25

A typical ___ ignites powdered copper-oxide and aluminum to produce a heat reaction.

Answer 25

exothermic welding process