Right Air-Conditioners for the Right Place
Air-conditioners can be broadly classified into
domestic, commercial and industrial, based on their
Widely used, domestic air-conditioners come in two
types: window type and 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.
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.
Electrical Contractor should possess a licence from
Choosing an electrical
- Once you have your job requirements ready,
ask for quotations from well-established contractors.
Remember, the lowest price is not always the
- Hire only a contractor
who possesses a valid licence from the state
- Check if he has sound
technical background. Ask him to show you a
list of clients and check 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.
for 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
• Application - Eg: for a chemical industry, flame
proof cables (FRLs) need to be used.
• Since there are many spurious cables available
in the market, always buy cables with the ISI
• Test for the insulation value (Megger test)
and core continuity before buying the cable.
• Check the number of cores required.
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.