Other
Wires, Cables, Switches, Fuses- Sem 1 and 2 KTU Electrical Lab Manual
- Module
- Institution
Wires, Cables, Switches, Fuses-All types
[Show more]
Seller
Follow
thejtthomas
Content preview
Exp.No:3WIRES, CABLES, SWITCHES AND FUSES
OBJECTIVE
To identify different types of wires, cables, switches, fuses and their uses.
THEORY
Electrical Wires and Cables
In electrical house wiring, it is difficult to differentiate between wire and cable as
these are used more or less synonymously. Single wire which may be bare or covered
with insulation is known as wire. Several wires with insulation and stranded together
is known as cable. The cable consists of three parts:
1. Conductor or core – Aluminium or copper wire
2. Insulation – to cover aluminium or copper
3. Protective covering – to cover insulation for protection against mechanical
damage or moisture.
Conductor Material
The principal materials used to produce electrical conductors are the copper and
aluminum. The copper is mechanically strong, durable and ductile. It is highly
resistive to corrosion and oxidation. It can withstand high temperature and dampness.
The copper being costly material, is used for power distribution for long distances.
The aluminium being light and not so strong, it is used for transmission line
conductors reinforced by steel wires.
Insulating Material
The insulation of cable should have high resistance, dielectric strength, capacity to
withstand high temperature, mechanical strength and should be non-inflammable.
Various types of insulating materials used in cables are: rubber, Vulcanised Indian
Rubber(VIR), Paper, Poly-vinyl Chloride(PVC), Vulcanised Bitumen, Cotton and
Silk, Gutta-Percha, Enamel Insulation and Varnished Cambric.
1
, Wire Gauge
The wire gauge, the measurement of wire diameter, determines the amount of
current that a wire can carry safely as well as its electrical resistance and weight.
Generally larger guage numbers are used to represent the smaller wire diameter. A
standard wire guage tool is shown below.
Types of Wires Used for Internal Wiring
The wires used in domestic installation can be divided into the following:
1. V.I.R. Wires – Vulcanised Indian Rubber Wires have only single braid of
rubber of 250 volts grade. Such wires are used in ordinary electrical wiring.
2. P.V.C. Insulated Wires – Poly-vinyl Chloride insulated wires have more
insulating qualities. These wires are used in concealed conduit wiring system
3. T.R.S. or C.T.S. Wires – Tough Rubber Sheathed or Cab Type Sheathed wires
are provided with a tough rubber compound which does not deteriote even
after long exposure to moisture.
4. Lead Alloy Sheathed Wires – The ordinary wires are covered with a
continuous sheath of lead . They provide complete resistance to moisture and
are recommended where climatic conditions are not dry.
5. Weather Proof Cables – These cables are used for outdoor wiring and
underground duty. The insulate individual wires are formed together (to make
it 3core or 4 core) suitably taped together, braided and then compounded with
weather resisting material.
2
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller thejtthomas. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for £2.35. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
77333 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy revision notes and other study material for 14 years now
Recently viewed by you
Other ·
Staircase Wiring-Sem 1 and 2 KTU Electrical Lab Manual
