Page 51 - Electrician - TT (Volume 1)

ELECTRICIAN - CITS

3 According to the cross-sectional area of conductor.
2 and 3 are find using micrometer
Terms used in electrical cables
Wire
A solid conductor or an insulated conductor (solid or stranded) subjected to tensile strength with or without screen
is called a wire.
CABLE
A length of insulated conductor (single or stranded) or two or more conductors, each provided with its own
insulation, which are laid up together
TYPES
1 Armoured cable: Provided with a wrapping of metal, serving as a mechanical protection.Used for underground
system
2 Flexible cable: Contain one or more cores, each formed of a group of wires. The diameter of wires sufficiently
small afford flexibility
Types of cables
1 VIR (Vulcanized Indian Rubber) cable4.PVC (Poly Vinyl Chloride) cable
2 TRS (Tough Rubber Sheathed) or5.Weather proof cable
CTS (Cab Tire Sheathed) cable6. Flexible cable
3 Lead sheath cable

Wire joints - Types - Soldering methods

Objectives: At the end of this exercise you shall be able to
• state the different types of wire joints and their uses
• state the necessity of soldering and types of soldering
• state the purpose and types of fluxes
• explain the different method of soldering and techniques of soldering
• explain the type of solder and flux used for soldering aluminium conductor.

Definition of joint: A joint in an electrical conductor means connecting/tying or interlaying together of two or
more conductors such that the union/junction becomes secured both electrically and mechanically.
Types of joints: In electrical work, different types of joints are used, based on the requirement. The service to be
performed by a joint determines the type to be used.

Some of the commonly used joints are listed below.
• Pig-tail or rat-tail
• twisted joints
• Married joint

• Tee joint
• Britannia straight joint
• Britannia tee joint
• Western union joint
• Scarfed joint

• Tap joint in single stranded conductor

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CITS : Power - Electrician & Wireman - Lesson 5 - 12