Asad Wires

8/12/2019 Asad Wires

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Muhammad Asad Rahman 1

Electrical Services Design

(EEE 350)

Muhammad Asad RahmanLecturer, Dept. of EEE

CUET

http:/asad31.webs.com


Wires, Wire Splicing

and Termination


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Learning Objectives

To familiar with the different types of wires

To know the method of splicing

termination and jointing


Wires and Cables

A wire is a single slender rod or filament of

drawn metal.

Wires are used to bear mechanical loads and to

carry electricity and telecommunications signals.


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Wires and Cables A conductor is a wire suitable for carrying an

electric current.

A stranded conductor is a conductor composed

of a group of wires or of any combination of

groups of wires.


Wires and Cables A cable is either a stranded conductor (single-

conductor cable) or a combination of conductorsinsulated from one another (multiple-conductorcable).


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Wires and Cables The term "cable" is a general one and usually

applies only to the larger sizes of conductors.

A small cable is more often called a strandedwire or cord (such as that used for an iron or alamp cord). Cables may be bare or insulated.

Insulated cables may be sheathed (covered)with lead, or protective armor.


Sizes of Wires

Two standard

- British Standard Wire Gauge (S.W.G.)

- American Wire Gauge (Brown and

Sharps Gauge)


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Sizes of WiresBritish Standard Wire Gauge (S.W.G.)

Largest

Smallest


Sizes of Wires

British Standard Wire Gauge (S.W.G.)


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Sizes of WiresAmerican Wire Gauge (AWG)


Sizes of WiresAmerican Wire Gauge (AWG)


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Construction of Cables

Insulation impregnated paper, varnished cambric or rubber mineral compound

Sheath a metallic sheath of lead or aluminum

Bedding a fibrous material like jute or hessian tape

Armouring one or two layers of galvanised steel wire or steel tape

Serving a fibrous material like jute


For Bangladesh

Different nomenclatures & Designation

N According to VDE standard

B According to British standard (B.S. 6004)I According to B.S. 2004:1961

Y Insulation or sheath of thermoplastic

based on PVC

A Insulated single core cable

E Earth continuity conductor


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For Bangladesh

Different nomenclatures & Designation

re Conductor of single solid wire havingcircular cross-section

rm Conductor of multiple stranded wireshaving circular cross-section

sm Conductor of multiple stranded wires

having sector shaped cross-section


For Bangladesh

BYA 7 / 0.85 rm

B According to British standard (B.S. 6004)

Y PVC Insulation

A Nonsheathed single core

7 / 0.85 = No. and nominal diameter of wires

rm = Conductor of multiple stranded wires

having circular cross-section


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Types of WiresRubber covered, taped, braided and

compoundedor

V.I.R. wires (Vulcanized Indian Rubber

insulated cable)

A layer of rubber insulation a cotton protective braid (saturated with flame

retarding and moisture-resistant compound) finished with wax


Types of WiresLead Alloy Sheathed Wires

Recommended for moisture condition.

The lead covering is usually thin about 1.25 mm thick.


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Types of WiresTough Rubber Sheathed (T.R.S.)or

Cab Tyre Sheathed (C.T.S.) Wires

Much cheaper than lead alloy sheathed wires.


Types of WiresWeather Proof Wire

For outdoor purpose.

consists of 3 braids of fibrous yarn.

braid are saturated with a water proof compound.


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Types of WiresFlexible Wire

used for household appliances.


Wiring Splicing & Termination

Western Union Splice

remove insulation only for a

required lengthi.e., 2.5 cm.

gently clean with sand paper.

for making the joint, cross thetwo bare wires at ends at a

distance of about 2 cm. from

insulation of either of the wires.

solder the joint using a

soldering iron or blow lamp.

taping the splice.


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Wiring Splicing & TerminationMarried Joint

for wires having a number

of strands, married joint is

used.


Wiring Splicing & TerminationStaggering Splices

It has double advantages

avoids the accidental short circuit between the two cores.

does not make the splice bulky.


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Wiring Splicing & TerminationRattail Joint

required for termination of the wire in switches, holders etc.


Wiring Splicing & TerminationFixture / Pigtail Joint


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Wiring Splicing & TerminationKnotted Tap Joint



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Terminal Lugs


Terminal Lugs


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Terminal Lugs


Summary

Different types of standard used for wire

Various types of wires used in electrical

work Wire splicing and termination


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