Splicing

Question 1

An ideal cable joint (splice) should be as strong and reliable, both ? , as the cable in which it is installed.

Answer 1

electrically and physically

Question 2

There are ? factors that cause longitudinal stresses in a splice.

Answer 2

3

Question 3

Of the factors that cause longitudinal stresses in a splice, using unlike splicing materials is not one of them.

Answer 3

False

Question 4

The way the different parts fit together in relation to each other (geometry) in a joint is one of the factors that cause longitudinal stresses in a splice.

Answer 4

True

Question 5

The ? is another factor that causes longitudinal stresses in a splice

Answer 5

Connector shape

Question 6

A great deal of emphasis is placed on the elimination of air voids in a joint (splice) because they may be potential sources of ? .

Answer 6

Corona

Question 7

When the stress in the air voids in a joint exceeds the breakdown value it ?

Answer 7

Ionizes
Produces ozone
Becomes conductive

Question 8

The product that first allowed medium and high voltage splices to be connected using standard crimp-type (compression) connectors is ? .

Answer 8

Semi-conducting tape

Question 9

The yellow (color coded) mastic material refers to the ? .

Answer 9

Stress relief mastic

Question 10

A ? can be defined as two or more conductors joined with a suitable connector, re-insulated, re-shielded, and re-jacketed with compatible materials applied to a properly prepared surface.

Answer 10

Splice

Question 11

There are ? reasons for splicing shielded cables.

Answer 11

5

Question 12

Tapping into an existing cable is one of the reasons for splicing shielded cables.

Answer 12

True

Question 13

The industry standard that establishes electrical ratings and test requirements of shielded cable splices (joints) is the IEEE Standard ? ,

Answer 13

404

Question 14

A hand-wrapped tape splice is no longer one of the common types of splices used because it is too difficult to apply.

Answer 14

False

Question 15

One of the common types of splices used is the ? elbow splice.

Answer 15

600 amp

Question 16

There are two shrink splices in common use

Answer 16

Heat shrink
Cold Shrink

Question 17

One function of a medium or high voltage splice is to maintain metallic shield continuity.

Answer 17

True

Question 18

Controlling ? in the connector area is a function of a medium or high voltage splice.

Answer 18

Electrical stress

Question 19

A function of a medium or high voltage splice is to provide for ? of service life.

Answer 19

30-40+

Question 20

There are ? basic steps in building a splice.

Answer 20

5

Question 21

The proper type of connector for joining the aluminum conductors of two 15-kilovolt shielded cables is a(n) ? connector.

Answer 21

aluminum (AL/CU) inline compression

Question 22

Modern manufactured splice kits are normally easier and faster to install than traditional splices. However, they are generally more sensitive to ?

Answer 22

Proper Kit Selection
Cable preparation dimensions
Unique installation steps

Question 23

There is/are ? layer(s) of shielding that must be replaced when constructing a medium or high voltage splice.

Answer 23

3

Question 24

The functions that a splice jacket perform include are

Answer 24

Mechanical protection
Moisture sealing

Question 25

The key to a reliable medium or high voltage splice installation is

Answer 25

Good workmanship

Question 26

List three common reasons splicing may be required.

Answer 26

Supplied cable length is too short, cable failure, tapping into an existing cable.

Question 27

Why were old splices considered weak points?

Answer 27

Primitive tapes caused hot spots and de-rated the cable.

Question 28

What is the purpose of terminations or elbows?

Answer 28

They are required for terminating the ends of every shielded cable run.

Question 29

How do modern splices compare to cables in terms of quality?

Answer 29

Properly installed modern splices are generally as good as, or better than, the cables.

Question 30

What is IEEE Standard 404?

Answer 30

The standard for shielded cable joints rated 2,500–500,000 V, requiring 100% production testing.

Question 31

What must always be matched when selecting a splice?

Answer 31

The splice’s voltage rating must match the cable’s rating.

Question 32

List two main electrical functions of a splice.

Answer 32

Control electric stress in the connector area and insulate between conductor and ground.

Question 33

What are the five basic steps in building a splice?

Answer 33

1) Prepare cables, 2) Join conductors, 3) Re-insulate, 4) Re-shield, 5) Re-jacket.

Question 34

What is the standard connector for medium/high voltage splicing?

Answer 34

Compression (crimp) connector.

Question 35

What connector is acceptable for aluminum and copper conductors?

Answer 35

Aluminum-bodied connector.

Question 36

What is used to re-insulate splices in traditional and modern methods?

Answer 36

Traditional: Rubber splicing tape; Modern: Pre-molded, cold shrink, or heat shrink kits.

Question 37

What shielding layers must be replaced during re-shielding?

Answer 37

Semi-conducting strand shield, semi-conducting insulation shield, and metallic shield.

Question 38

Name three types of optional jacketing materials.

Answer 38

Heat shrink tubing, resin, and metal sleeves with potting compound.