Job Information Level 1: Lesson 10 Using and Installing Twist-On Wire Connectors

Question 1

Improper electrical terminations lead to high ? connections, which in turn lead to electrical system failures.
Select one:

a.
amperage

b.
capacitance

c.
cost

d.
resistance

Answer 1

resistance

Question 2

The first consideration in making good electrical connections is the type of conductor ? involved. The NEC recognizes copper, aluminum, and copper-clad aluminum; each of which has different physical characteristics.
Select one:

a.
diameter

b.
insulation

c.
length

d.
material

Answer 2

material

Question 3

If conductors of ? materials are to be used, the termination device shall be identified for use with both types.
Select one:

a.
aluminum

b.
copper

c.
dissimilar

d.
the same

Answer 3

dissimilar

Question 4

Splicing devices and terminations utilizing mechanical pressure are common in the electrical industry. Most commonly, ? wire connectors are used for splicing conductors.
Select one:

a.
aluminum

b.
copper

c.
twist-on

d.
set-screw

Answer 4

twist-on

Question 5

The ? connector utilizes mechanical pressure to establish a splice that maintains excellent mechanical and electrical properties. This type of splicing device is commonly used when tapping one conductor from another.
Select one:

a.
lugs

b.
screw-on

c.
split-bolt

d.
wire connector

Answer 5

split-bolt

Question 6

? are commonly used for both low-voltage and medium-voltage applications. They are easy to use and are frequently found where power distribution conductors terminate in transformers and power panelboards.
Select one:

a.
Lugs

b.
Screw-on

c.
Split-bolt

d.
Wire connectors

Answer 6

Lugs

Question 7

One disadvantage with lugs is that the termination is subject to influences that might impact the overall reliability of the termination. Vibration or heat cycling might result in a loose connection that raises the resistance of the connection, thus, subjecting the termination ? .
Select one:

a.
to an increase in mechanical pressure

b.
to an increase in reliability

c.
to an increase in wear

d.
to an increased temperature

Answer 7

to an increased temperature

Question 8

Compression connectors are also widely used within the electrical industry and can be utilized for both low-voltage and medium-voltage applications. The principle behind the compression connector is the application of ? pressure, either pneumatically or by hand, to ensure the connection.
Select one:

a.
irreversible

b.
limited

c.
low

d.
reversible

Answer 8

irreversible

Question 9

When the termination is a terminal block, care must be taken to ensure a good electrical connection without damaging the conductor. Terminals should not be used for more than ? conductor(s), unless they are identified for such use.
Select one:

a.
one

b.
two

c.
three

d.
four

Answer 9

one

Question 10

If the splice is underground, the device shall be ? for direct-burial use.
Select one:

a.
designed

b.
identified

c.
listed

d.
manufactured

Answer 10

listed

Question 11

Equipment, such as conductors, are rated according to how much ? can occur at the conductor termination.
Select one:

a.
corrosion

b.
heat rise

c.
insulation breakdown

d.
pressure

Answer 11

heat rise

Question 12

In general, equipment terminations for circuits rated 100 A or less, or designed for 14 AWG through 1 AWG conductors, are rated for use on ? . Conductors with a higher rated insulation termination are allowed, provided the conductor’s ampacity is selected from the lower rating.
Select one:

a.
30°C conductors

b.
60°C conductors

c.
75°C conductors

d.
90°C conductors

Answer 12

60°C conductors

Question 13

Both the conductor and equipment temperature ratings shall be considered when designing or installing electrical systems. The ? of the conductor shall be selected so that the lowest temperature rating of the conductor or any equipment in the circuit is never exceeded.
Select one:

a.
ampacity

b.
resistance

c.
temperature

d.
voltage

Answer 13

ampacity

Question 14

To understand how to make proper electrical connections, the Electrical Worker needs to understand ? .
Select one:

a.
proper termination techniques

b.
the compatibility of the connector to the conductor

c.
the environment in which the connection is to be made

d.
all of the above

Answer 14

all of the above

Question 15

When a connector is marked with “AL-CU,” the connector is suitable for use with copper, copper-clad aluminum, and aluminum conductors.
Select one:
True
False

Answer 15

True

Question 16

? connectors are made up of a thermoplastic or nylon insulating cap that has a threaded core of plastic or corrosion-resistant spring steel.
Select one:

a.
Bolted-type lug

b.
Compression-type

c.
IDC

d.
Run and Tap

e.
Twist-on

Answer 16

Twist-on

Question 17

Twist-on connectors without the spring-steel coils (plastic threads only) are suitable for making branch-circuit connections.
Select one:
True
False

Answer 17

False

Question 18

The standard color code for determining the number and size of conductors that can be used in twist-on wire connectors is ? .
Select one:

a.
blue, orange, yellow, and red

b.
gray, blue, orange, yellow, and red

c.
gray, blue, orange, yellow, red, tan, and green

d.
none of the above (There is no standard color code used for twist-on connectors.)

Answer 18

none of the above (There is no standard color code used for twist-on connectors.)

Question 19

The maximum voltage rating for wire connectors used to terminate inside building wire is 600 volts.
Select one:
True
False

Answer 19

True

Question 20

Standard twist-on wire connectors are not suitable for terminating or splicing aluminum or copper-clad aluminum conductors.
Select one:
True
False

Answer 20

True