IEC Year 1 Final

Transfer switches use a ___ to prevent the feedback of electricity between the generator power and the normal utility power.

mechanical interlock

A standby power system has been installed at a dwelling. The NEC® requires the electrician to place a sign at the service-entrance equipment. What information about the standby power system must appear on the sign?

Location

___ shall be suitable for the intended use and shall be listed, designed, and installed so as to prevent the inadvertent interconnection of all sources of supply in any operation of the transfer of equipment.

Transfer equipment

During a power outage, a standby power system supplied by a cord-connected portable generator ___.

requires a manual or supervised startup

A portable (temporary) generator should be operated outside and in open air because ___.

Question 5 Select one:

a.

a generator does not look good in a living room

b.

vibrations would cause paint to chip off the walls

c.

the noise would disturb sleep

d.

the exhaust gases are toxic

e.

All of these

the exhaust gases are toxic

When portable generators are stored until needed by a homeowner or small business owner to operate cord-connected equipment, these are commonly referred to as ___ power sources.

backup

NEC® Section ___ requirement is that an optional standby system shall be capable of supplying the full load that is transferred by the automatic transfer equipment.

702.4

The NEC® requires that all 125-volt and 125/250-volt, single-phase, 15-, 20-, and 30-ampere receptacle outlets that are a part of a ___ kW or smaller portable generator have listed ground-fault circuit-interrupter protection for personnel.

15

When installing any audio/video/data cables, the cable runs should ___.

Question 1 Select one:

a.

be bundled loosely with other cables

b.

not be kinked or knotted

c.

be secured with rounded or depth-stop staples

d.

All of these

All of these

When installing any audio/video/data cables, the conductors should be untwisted about ___ inch(es) at the point of termination.

1/2

Home automation controllers that utilize infrared (IR) ___.

require the receiver to be in sight of the sender

Cat 5e and 6 cables are highly ___ to interference from power wiring.

immune

Cat 5 cable should be installed so that bends are not less than ___ times the diameter of the cable.

4

Metal signs installed inside a fountain are required to be grounded.

True

Panelboards that are not part of the service equipment and that supply any electrical equipment associated with the fountain are required to be grounded.

True

Proper grounding and bonding of all the metal parts in and around a pool area ___.
  I.      assures that all conductive surfaces are at the same ground potential
 II.      reduces the shock hazard to persons
III.      ensures that OCPDs (circuit breakers and fuses) operate properly in the event of a fault

I, II, & III

The Code requires that all metal parts of a pool installation be bonded to a common bonding grid by ___ AWG or larger solid copper wire.

8

All electrical equipment within ___ feet of the inside walls of an indoor spa or hot tub must be grounded.

5

The steel walls of a bolted or welded metal pool may be used as a common grid to bond metal parts of a pool and equipment in a pool.

True

When swimming pool installations are made, Article ___ in the NEC® provides the requirements for these installations

680

The maximum suggested immersion time in a hot tub with a water temperature of 104 degrees Fahrenheit is ___ minutes

15

When in a swimming pool, a person may sustain electrical shock by ___ contact.
I.  direct          II.  indirect

either I or II

GFCI protection for personnel ___ protect a person against the sensation of feeling a shock.

does not

Does the NEC® permit a panelboard to be installed in a bathroom in a dwelling?

No

When installed in a safety switch, fuses ___ permitted to be connected to a neutral conductor.

are not

The panel shown in Figure 132.101 is 120/208-volt, 3Ø, 4-wire. The disconnect switch is fused with plug fuses and supplied from a 2-pole breaker in space 6-8 in the panel. This ___ a Code violation.

is not

A fused switch is permitted to be located ___.
  I.      in the bathroom in a house
 II.      in an electrical room in a school
III.      in a bathroom in a hotel room

II only

Generally, fuses must be ___.

readily accessible

Which of the following types of current travel through a circuit breaker?

Select one:

a.

Short-circuit

b.

Ground-fault

c.

Normal

d.

Overload

e.

All of these

all of these

The NEC® has limitations on where OCPDs, such as panelboard installations, can be installed due to the presence of combustible materials. These are specified at ___.

240.24(D)

Self-tapping sheet metal screws (TEK screws) ___ permitted to be used to connect the equipment grounding conductor to a metal box.

are not

The grounding electrode conductor shall be ___.

Question 2 Select one:

a.

copper

b.

copper or aluminum

c.

copper, aluminum, or copper-clad aluminum

d.

aluminum or copper-clad aluminum

copper, aluminum, or copper-clad aluminum

An equipment bonding jumper (BJ) is the connection between two or more portions of the ___ conductor.

equipment grounding

To minimize conductor insulation damage and arcing damage to electrical equipment during a ground fault or a short circuit, ___ should be minimized.

Question 5 Select one:

a.

time duration of the fault

b.

ampere level of the fault current

c.

Both a and b

d.

Neither a nor b

time duration of the fault

Article ___ in the NEC® covers grounding and bonding of electrical systems.

250

___ can be described as the point of demarcation between where the serving utility ends and the premises wiring begins

service point

Service conductors shall have a clearance of not less than ___ feet from windows, doors, or similar locations that open.

3

10.05 cents equals $___.

.1005

What term defines the conductors and equipment required to deliver energy from the electric supply source to the wiring system of the premises?

service

Services for one- and two-family dwellings are most often rated ___

120/240-volt, single-phase, 3-wire

Which term best describes a service lateral?

Underground feed

What is the result if the neutral wire becomes open on a multiwire circuit having unequal loads?

Question 2 Select one:

a.

No effect.

b.

No effect until one load is turned off or opens.

c.

The load of lesser resistance would overheat and probably be damaged.

d.

The load of higher resistance would overheat and probably be damaged.

The load of higher resistance would overheat and probably be damaged.

Two 20-amp circuits with a shared neutral are fed from a 120/240-volt, 1Ø panel. If the ungrounded circuit conductors are connected to breakers 1 and 2, which of the following will happen when a 16-amp load is connected to Circuit 1 and a 14-amp load is connected to Circuit 2?

The grounded (neutral) conductor will be overloaded.

Circuits 7 and 9 share a neutral. This is a multiwire branch circuit. If Ckt. 7 is drawing 13 amps and Ckt. 9 is drawing 16 amps, how much current is flowing in the neutral?

3

Figure 128.203

Refer to Figure 128.203. The voltage across Lamp 1 is ___ volts

120