Splicing and terminating (low voltage)

Question 1

list 4 common classes of of terminations/connections

Answer 1

1. soldered
2. fused
3. mechanical
4. compression

Question 2

What is exothermic welding most often used for?

Answer 2

For connecting grounding and bonding conductors.

Question 3

True or false? Compression connections are considered to be of the nuts and bolts type.

Answer 3

False

Question 4

True or false? The soldering process is used to tin stranded conductors.

Answer 4

True

Question 5

What methods should be used to remove insulation from a conductor

Answer 5

penseling and stripping with appropriate tool for the cable

Question 6

True of false? Insulation should be removed from a conductor by ringing the insulation at 90 degree to the conductor.

Answer 6

false

Question 7

What problems can a scored conductor introduce.

Answer 7

It can break & can have its section reduced

Question 8

What is the key feature of a tool designed to remove the outer sheath of a multi conductor cable?

Answer 8

It must remove only the sheath without damaging the insulation of the underlying conductors OR it must remove the insulation without damaging the underlying conductor itself.

Question 9

What four properties must be considered when selecting splicing insulation material

Answer 9

1. Max. voltage
2. Max. temperature
3. Material and form of the cable
4. Environmental conditions

Question 10

Name 4 materials that can be used to reinstall a spliced conductor.

Answer 10

1. Tapes
2. Heat shrinkable tubing
3. Preformed insulating covers and boots
4. Splicing compound

Question 11

List the 3 types of wire or cable connections.

Answer 11

1. splices
2. taps
3. terminations

Question 12

What is a splice?

Answer 12

The joining of two or more conductors of the same size and ampacity.

Question 13

What is a tap?

Answer 13

The joining of two or more conductors with a conductor of a smaller size and ampacity.

Question 14

What is a termination of a conductor?

Answer 14

The final destination of a conductor at a control or utilization device.

Question 15

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

Answer 15

10 AWG

Question 16

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

Answer 16

clockwise

Question 17

What must be considered when selecting a compression tool and die to attach a compression terminal to a conductor?

Answer 17

It must be the correct tool, recommended by the manufacturer.

Question 18

In which direction must twist-on connections be twisted?

Answer 18

clockwise

Question 19

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

Answer 19

Sharp edges must be filed.

Question 20

What is important to remember when terminating stranded conductors?

Answer 20

To confine all the strands in the terminal.

Question 21

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

Answer 21

1. When the connection must be taken apart many times.

2. When vibrations may affect the connection.

Question 22

List 4 problems relating to aluminum conductors.

Answer 22

1. Oxidation
2. Cold Flow
3. Thermal Expansion
4. Galvanic corrosion

Question 23

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

Answer 23

CU/AL or CO/ALR

Question 24

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

Answer 24

3/4 of the way wrapped in clockwise direction.

Question 25

What danger is there when removing the insulation from aluminum conductors?

Answer 25

They could be easily scored and broken.

Question 26

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

Answer 26

Anti-oxidant

Question 27

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

Answer 27

Copper must be underneath, in order to prevent copper oxide salts from flowing onto aluminum and causing corrosion.