Air-conditioners can be broadly classified into domestic, commercial
and industrial, based on their applications.
 Widely
used, domestic air-conditioners come in two types: window type
and the split type. The split type is divided into two units:
the compressor, which is the heart of the air-conditioner and
also the noisier part which works outside the room, and the
evaporator which works inside the room. The split type is more
convenient because the noise of the AC is kept well outside
the room. Choosing an AC's tonnage depends on where you instal
it & the size of the room. For an average sized living room
or office cabin, you would need a 1-ton or 1.5-ton AC. A 1-ton
AC can cool approximately 180 sq. ft. If installed in a restaurant
of the same proportions, added tonnage is required since the
head count and the body heat are greater, increasing the load
on the AC. For an office set up, the best choice is an Air Cooled
Split Ductable which conveys cool air through ducts into space.
This is recycled with some fresh air. If soft water and space
for a cooling tower are available, go for water-cooled self-
contained units. For rooms with computers and in electronic
telephone exchanges, where control of temperature, humidity
and air cleanliness are important, close control units of 7.5
tons to 10 tons are recommended. If your AC is exposed to sunlight,
insulate. Reduce glass area in a room with an AC, since glass
allows a lot of heat inside. Always allow for free circulation
of air behind the condenser.
An Electrical Contractor
Should Possess A License From The Govt.
Choosing an electrical contractor :
 *
Once you have your job requirements ready, ask for quotations
from well-established contractors. Remember, the lowest price
is not always the best. * Hire only a contractor who possesses
a valid license from the state government. * Check if he has
sound technical background. Ask him to show you a list of clients
and check back with them to find out his quality of work and
his reliability. * Along with him, make a list of all the materials
required, and check the quality of materials he will use later
on. How to get the best from your contractor ? Keep machinery
details and your layout plan ready before estimation to ensure
that your estimate and the final billing do not vary by a wide
margin. Ensure timely payments as agreed upon for timely completion
of your work.
Test For The Insulation
Value...
Cables are a mode of transmission of power from the source to
the point of distribution or load. There are different types
of cables like PVC sheathed, XLPE, rubber insulated, etc. Note
the following points while selecting cables:
 •
Voltage class you require.
• Current required by the load.
• Material of the conductor, i.e aluminium or copper.
• Application Eg: for a chemical industry flame proof cables
(FRL's) need to be used.
• Since there are many spurious cables available in the market,
always buy cables with the ISI mark.
• Test for the insulation value (Megger test) and core continuity
before buying the cable.
• Check the number of cores required.
Buy Gensets Only From
An Authorised Dealer
When you buy any type of portable genset, the most important
qualities you should look for are fuel efficiency and durability.
 Buy
a genset according to the total output you require - length
of time and amount of power. For instance: to run two 60 watt
bulbs, two tubelights (45 watts each), two fans (60 watts each),
one TV (60 watts) and one VCR (40 watts), you would need a 650
watts generator. On the other hand if you need to run three
fans (180 watts), two bulbs (120 watts), one refrigerator (270
watts), two PCs and a printer (270 watts), and a cooler (360
watts), you would need a 2000 watt generator. Buy only from
an authorised dealer and always demand a bill. See that the
dealer gives you prompt after sales service.
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