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CABLE

CABLE

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University

Hard

Created by

NURUL SYAFIQAH

Used 5+ times

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20 Slides • 17 Questions

1

CABLE

Electrical Cables

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2

What is electrical cable?

  • Electrical cable is a wire that is made up of 2 or more wires running side by side and bonded, twisted or braided together to form a single assembly.

  • The end of wire cable is connected to 2 devices.

3

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Example of bonded wire cable

4

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Example of twisted wire cable

5

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Example of braided wire cable

6

Purposes of wire cable

  • To transfer electrical signals from one device to the other.

  • It is used extensively in electronic devices for power and signal circuits.

7

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Examples : Undersea cables is used for long distance communication

8

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Example : Power cable to transmit bulk of electrical power whether in AC or DC

9

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Example : Electrical cables that is used in building wiring for lighting, power system and control circuits

10

Multiple Select

Which is TRUE about the purpose of electrical wire cable?

1

To transmit electrical energy from one end to the other.

2

To propagate the electrical signal from the emitter to the receiver.

3

As a pathway to transfer electrical energy

4

As a medium for electrical distribution system.

11

Multiple Select

Is the electrical distribution and electrical transmission system are the same?

1

Yes

2

No

12

Parts of wire cable

  • Wire cable can be categorized in of 3 different parts which are Conductor, Insulator and Sheathing (Inner and Outer).

  • This 3 parts played different roles and important for the safety usage of the wire cable itself.

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13

Multiple Choice

Which item is not the main parts of a wire cable?

1

Insulator

2

Sheathing

3

Conductor

4

Resistor

14

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Figure 1 : Parts of wire cable

15

Fill in the Blank

From Figure 1: Name part A

16

Fill in the Blank

From Figure 1: Name part B

17

Multiple Choice

From Figure 1: Name part C

1

Insulation

2

Conductor

3

Sheathing

4

Inner sheath

18

Multiple Choice

From Figure 1: Name part D

1

Insulator

2

Inner Sheath

3

Outer sheath

4

Armoring

19

Cable Conductor

  • It mainly used to carry electrical power from one device to the other.

  • Is made up of highly conductive material such as copper.

  • It can be categorized into classes based on the number of strands in it.

  • Higher the class, more number of strands in conductor involved

  • Class 1: Solid , Class 2: Stranded (7 or 19 strands), Class 5: Flexible (Due to multi-stranded) and Class 6 : Extra flexible (For dynamic used such as cords or welding)

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20

Multiple Choice

Is Class 1 type of conductor is more fragile than Class 5 type?

1

Yes

2

No

21

Multiple Select

Beside Copper, choose the material can be used as a conductor

1

Rubber

2

Silver

3

Aluminium

4

Glass

22

Cable insulation

  • To prevent the electrical current from leaking out of the cable.

  • Mainly made up of high insulation material such as Poly Vinyl Chloride (PVC), Cross Linked Poly Ethylene (XLPE) or Rubber (Various type of rubber)

  • Material used mostly based on its ambient operating temperature to enable in resisting high temperature.

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23

Cable sheath

  • To bundle the conductors together if there are multiple wires inside a cable.

  • The cavity inside the sheath can also be filled with lubrication oil or insulation to protect the conductors.

  • It can be divided in 2 category which are inner sheath (bedding) and outer sheath.

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24

Multiple Choice

What is the main function of cable insulator?

1

To transmit electrical voltage from one point to another.

2

To resist the electrical voltage flow through the wire cable.

3

To prevent the electrical voltage from leaking out of the cable.

4

To provide support for the wire cable.

25

Multiple Choice

What is the suitable material used for some part of the wire cable?

1

Conductor - Rubber

2

Insulator - PVC

3

Sheathing - Copper

26

Multiple Select

Which sentence is true about Inner sheath ?

1

Carry power from one end to the other

2

Mostly used in multi-core cable

3

Provide bedding to armour or braid

4

Mainly made up of PVC or Rubber

27

Multiple Select

Which sentence is true about outer sheath?

1

Made up of PVC or Rubber

2

Outermost cover of the cable.

3

Provide from external resistance such as mechanical, weather, chemical and electrical.

4

Provide bedding to armour or braid

28

Reaction of cables to a fire

  • Cables are backbone of electrical power and communication system.

  • It is important to test its reaction towards the fire in order to determine their contribution might affect the fire growth or safe evacuation.

  • BASEC is a specific party who is appointed to develop more reliable and consistent test in this field.

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29

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The test of the wire cable toward a fire is based on its 3 main technical group

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  1. Reaction to fire
  • The test is conducted in order to see how does the cable react when it is exposed to fire.

  • They are usually performed on a non-energized cable with a gas burner applied to the cable for a fixed period of time

  • Measurement criteria are usually based around linear spread of burning, or the emission of gases or smoke from the cable

31

2.Fire resistance (Circuit Integrity)

  • Circuit integrity tests are generally performed on an energized cable at maximum operating voltage using a ribbon burner.

  • Measurement criteria are usually based on how long the cable can continue to operate for a specific time period without failure.

32

3.Material Properties

  • It is carried out on a small length of cable or piece of material

  • Measurement criteria are usually based on physical properties or chemical measurements

  • Tests include smoke emission (3 m cube test, IEC 60134), corrosive and acidic gas emission or halogen content (tube furnace tests, IEC 60754), carried out on a small length of cable or piece of material

33

Multiple Select

What is 3 main technical group to test wire cable interaction towards fire?

1

Smoke emission

2

Reaction to fire

3

Material properties

4

Fire resistance

34

Multiple Choice

What is BASEC stand for?

1

British appliance service for cable

2

British approval service for cable

3

British authorization service for cable

4

British approval system for cable

35

Multiple Choice

From the answer below, which is related to the reaction to fire group?

1

To determine the emission of hazardous smoke during burning.

2

To measure the efficiency of operating wire cable during burning.

3

To measure the propagation of fire along the cable.

36

Multiple Select

Why cable sockets need to be securely attached and locked on to the terminal?

1

To avoid wire cable from being loose and lead to short circuit.

2

To prevent arcing and overheating surround the wire cable which lead to a fire.

3

To avoid from direct contact to the user which may lead to electrocution.

37

End of slides

Thank you.

CABLE

Electrical Cables

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