Splicing and Terminating (Low Voltage)

Question 1

What is an exothermic reaction?

Answer 1

A reaction that lets off heat.

Question 2

What is exothermic welding?

Answer 2

It is the process of fusing (or melting) two materials together, such as copper and copper or copper and steel, using the heat from an exothermic reaction.

Question 3

Which method is often used to make grounding and bonding connections?

Answer 3

Exothermic weld method

Question 4

The three basic wire or cable connections are:

Answer 4

• splices
• taps
• terminations

Question 5

What is a requirement that all three basic wire and cable connections must have?

Answer 5

They must be mechanically and electrically secure.

Question 6

What is a splice?

Answer 6

A splice is the joining of two or more conductors of the same size and ampacity.

Question 7

What is a tap?

Answer 7

A tap is the joining of conductors where at least one of the conductors is smaller than the other(s).

Question 8

What is a termination?

Answer 8

The termination is the connection of a conductor to its final destination at a control or utilization device.

Question 9

Switches, circuit breakers, control panels and controllers are examples of ___ ___.

Answer 9

control devices.

Question 10

Receptacles, motors, heaters and appliances are examples of ___ ___.

Answer 10

utilization devices.

Question 11

What is the maximum size conductor that the CEC allows to be terminated under a screw without the use of the mechanical or compression connector?

Answer 11

10 AWG

Question 12

In which direction must a conductor wrap around a wire binding screw for proper termination?

Answer 12

Clockwise

Question 13

What must you consider when selecting a compression tool and die to attach a compression terminal to a conductor?

Answer 13

Tools and dies must be for this specific terminal size and manufacturer.

Question 14

In which direction must twist-on connectors be twisted?

Answer 14

Clockwise

Question 15

Why may you require a file when using a split bolt to make a splice?

Answer 15

To remove any sharp edges

Question 16

What is important to remember when terminating stranded conductors?

Answer 16

All the strands must be contained in the connection.

Question 17

Set screw type wire connectors are often used when either of these two conditions are encountered:

Answer 17

• The need for taking apart and putting the joint back together and
• where significant vibration may be encountered

Question 18

What are 4 problems relating specifically to aluminum conductors?

Answer 18

• Oxidation
• Cold flow
• Thermal expansion
• Galvanic corrosion

Question 19

What markings must be on a receptacle if it is to be used with aluminum conductors?

Answer 19

CO/ALR or CU/AL

Question 20

How must an aluminum conductor be terminated under a wire binding screw?

Answer 20

Three-quarters of the way around, wrapped in the clockwise direction.

Question 21

What type of compound must be used when making aluminum conductor connections?

Answer 21

anti-oxidant

Question 22

When aluminum conductors are joined to copper conductors, what environmental condition must be avoided in order to prevent corrosion?

Answer 22

Moisture

Question 23

When making open air connections between aluminum and copper conductors, which conductor must be underneath and why?

Answer 23

The copper conductor must be underneath in order to prevent copper oxide salts from flowing onto the aluminum and causing corrosion.

Question 24

The four most common classes of cable joints or terminations are:

Answer 24

1. Soldered connections
2. Fused connections
3. Mechanical connections
4. Compression connections