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INTRODUCTION
Electrical component is the component that is needed to generate, transmit,
distribute and consume the electric power. These elements consist of a few devices
such as inductor, resistor, capacitor, conductor, circuit breakers and timer. Such fittings
are also collectively known as accessories since they are seen as the accessory to the
wiring which is the main substance of the wiring installation.
Familiarity with electrical wiring accessories is an important provision beside an
awareness of and strict adherence to the provisions of the National Electrical Code
(NEC). Beside that, there also a regulation which are embedded for safeguard and
guarantee which is known as the IEE Wiring Regulations (BS 7671) that is basically a
set of recommendation dealing with the safe design, construction, inspection and testing
of low voltage installation of the wiring accessories.
OBJECTIVE
1. To determine the specific purpose and function of each electrical accessories
such as copper bush, inspection tee, trunking jointer, copper bridging, terminal
box and etc.
2. To review and discuss all the functions of electrical wiring accessories and
identify the types of electrical devices in building.
3. To find out schematic diagram of fluorescent lamp circuit and its function.
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LITERATURE REVIEW
A. WIRE COVER OR INSULATOR
Electricity is convey through metal conductor, thus to prevent it from leaking safety
precaution should be taken. The wire must be covered from any contact with other
material or thing especially us, human being as it can be kick in the bucket if
protection is not done so.
WIRING ACCESSORIES FUNCTION
1.
TRUNKING JOINTER
To put a large number of cables to run
together (Barrie Rigby, 2001)
2.
BAR SADDLE
To secure multiple runs of wire.
To fix tough rubber- sheath and PVC0 sheath
(Henry A. Miller, 1985)
3.
CONDUIT
To protect PVC insulated cable
( F. Porges, 1989)
4.
COPPER BUSH
To provide a smooth entry into the box and
avoid sharp corners which cause damage in
cable insulation.
(F. Porges, 1989)
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5.
RUNNING COUPLER
Grip the conduit and bite it into the metal
(F. Porges, 1985)
6.
GI LONG BEND
Fittings that are created for conduit do so that
the conduit can bend into the required
directions.
7.
GI FLEXIBLE ADAPTER
Device that is inserted into a socket outlet to
receive one or more plugs but it may have a
different corners (K.L Raina,1995)
8.
ELBOW
A short radius length of tubing for connecting
two length of conduits at right angle or 90º
(K.L Raina, 1995)
9.
COPPER BRIDGING
To measure electric capacity by null method
and the material that is made out of copper,
(K.G Jackson, 1981)
10
INSPECTION TEE
To change conduit direction
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B. PVC
PVC or polyvinyl chloride is a common material that is used for cable conductor.
It is used for some of larger power and sub- main cables which may tending to
supersede paper insulated cables (F.Porges, 1989)
PVC also can be mix with other material; common material which often mixed
with PVC is paper insulated cables (which will be described as PVC Insulated Steel
Armoured). For example, Single Core Paper insulated lead sheathed PVC is
abbreviated as PILSPVC and PVC that is insulated with Steel Wire Armoured PVC
Sheathed is abbreviated as PILSSWAPVC cable.
PVC also has different sizes according to their cross- sectional area which have
different current carrying capacity. The classifications of PVC are:
a) 1.5 mm e) 10mm
b) 2.5mm f) 25mm
c) 4mm g) 35mm
d) 6mm h) 60mm
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C. BOX
WIRING ACCESSORIES FUNCTION
1.
TERMINAL BOX
2 WAY BOX
4 WAY BOX
It is an enclosure which includes, mounts,
and protects one or more terminal boards; it
may include a cover such accessories as
mounting hardware, brackets, locks and
conduit fittings.
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2
3 x 3 CONCEAL BOX
3 x 6 CONCEAL BOX
M/C CONCEAL BOX (3 x 6)
It is a place to install the wire from the
distribution board.
It is the part of the plate that used to
plug in the electrical equipment.
D. SWITCH AND SOCKET OUTLET
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WIRING ACCESSORIES NAME AND DESCRIPTION FUNCTION
3.
1 GANG M/C SWITCH
Suitable for large building.
It can break an
electrical circuit,
interrupting the
current or diverting it
from on.
Sockets are
equipment that we
used to plug in the
electrical equipment
to another conductor.
4.
DOUBLE 13 A SOCKET
OUTLET
1 GANG M/C SOCKET
It contains 13A fuse and it is
used for domestic used
such as housing wiring.
Type of socket:
- 1 gang m/c socket
GANG METAL CLAD
Made from metal and
usually used for
industrial purposed.
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SOCKET
E. FLUORESCENT LAMP CIRCUIT
Fluorescent Lamp is consists of a long glass of tube that contain the mixture of mercury
vapour and argon gas at pressure if 2 to 5 mm mercury.
This circuit is including:
CIRCUIT COMPONENT FUNCTION
1. Starter Switch
2. Electrode
3. Argon gas When the electricity is supplied to the circuit, it will
discharge the argon gas in the tube that will increase
the temperature which enable it to exite the mercury
vapour in the tube
4. Mercury It will produce the short wave-ultraviolet light when it
is get excited
4. Phosphor Coating The material which will fluoresce or shine due to short
wave- ultraviolet and produce visible light.
5. Ballast To heat the filament (electrode) when power is
applied.
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PROBLEM RELATED
1. Improper Wiring Method
The electrical wiring method in this picture is clearly
one example of improper wiring method that can bring
hazardous and harmful to the people living nearby. There is
absolutely no insulator or any wiring cover to cover the wire.
This situation can be worst if there is lightning struck at the
wire or even huge flood occur at the place. Furthermore, I
doubt there are no lightning arrestor installed their. In
addition, I think that the authority at that area should look into
this matter and provide good safety for the people there. (Delhi, India)
2. No periodic maintenance
No periodic maintenance is one of the
causes that may bring problem to the wiring
component in the building. Beside that, it also
can bring damage to the building or to human
being due to electrical fire or injury to persons
by an electric shock. Therefore, it is crucial for
us to conduct periodic maintenance constantly
to ensure that the wiring system stays
according to the code compliant. (Poor Maintenance)
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CONCLUSION AND RECOMMENDATION
In brief, it is crucial to learn the electrical accessories in electrical components
and their functions. By that, we will enable to know more how the particular system
operates and in case of any malfunction we will know the source of the problem.
Nevertheless, perhaps the problem is too complicated or complex, we might have to ask
for the expert help. But, in cases where the problems are minimal we as civil engineer
can solve it as we have sufficient knowledge of it.
For some electrical wiring and component, not all of the same types of electrical
accessories can be used. For instance if the place requires the conduit that can be
bend, long bend should be used since it can be bend into the required condition.
Another example is that for the component which uses a lot of cables, trunk joint should
be used instead of conduit because it can cater more wires as compare to the normal
metal conduit.
In short, it is also important for us to understand more about the function of
electrical wiring accessories in the building.
Page | 10
REFERENCES
1) Barrie Rigby, “Design of Electrical Services for Building”, Fourth Edition, Spon
Press,(2001), 270 Madison Ave, New York.
2) Henry A Miller, “Practical Wiring Volume 1 in SI Units”, Pergamon Press,
(1985),Oxfod, New York.
3) F.Porges,”The Design of Electrical Services for Building”, Third Edition, Spun
Press, (1989), Great Britain.
4) K.L Raina, “Dictionary of Electrical Engineering” Cresent News,Kuala Lumpur.
5) http://www.ibuonhe.com/productdetail/channel-inspection-tee .
6) http://en.wikipedia.org/wiki/Fluorescent_lamp .
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