Construction of PVS Conduit Wiring System of Two Bedroom Bungalow
Chapter One
Preamble of the Study
In today’s domestic residence, electricity play a vital function base on how it is used. The institute of electrical engineering (IEE) wiring regulation (15th Edition) defines an electrical installation as an assembly of associated equipment for the fulfillment of specific purpose and having contain co-ordinated characteristics.
Based presented by engineering principle and intelligent conformity to the safety provision of the National Electrical Code. In the application of conductors, switches, insulators, fuses, circuit breakers, consumers control units, lighting fixtures and other related institution component. The design information is presented so as to clearly instruct the installer in constructing the overall electrical installation to achieve the design intent and implement the engineering concept.
CHAPTER TWO
REVIEW OF COMPOUND UNITS
ACCESSORIES
Threaded coupling are furnished with each length of conduit likewise threaded coupling, if they are installed lightly. Elbows, standard conduit elbows are manufactured for use where 90 degree bench are required.
Conduit unions are installed to permit the opening of a conduit at any point without saving or breaking the conduit run by using union, conduit may be stared from two outlets and joined together any convenient place in there conduit breaker, lamp holder spaced saddle elip (rubber) P.V.C. pipe glue, knockout boxes, conduit ceiling roses and switches.
BOXES AND CONNECTORS
Plastic or steel and last-iron outlet boxes are used in conduit installations. Boxes are normally supplies with knockout that are removable job inserting conduit. Bushing and knockout are provided for attaching the conduit to the boxes as shown in boxes that are used in wet or hazardous – location must have threaded huts into which the conduit is screwed.
FITTING
The two types of fitting are the standard ordinary outlet box and the small junction or pull boxes called condulets. The standard outlet box fitting are classified as type F and are normally used indisposed installations to house receptacle or switch where a high quality of installation is desired. Condulets provide intermediate point in long conduit runs for the pull-through of wire or provide functions for several concealed installation where they will not be accessible.
They are classified by the manufactures as follows.
- Services entrance
- Elbow or turn fitting type L
- Through fitting, type C
- Through fitting with 90otake off types T
DOMESTIC LIGHTING
Domestic lighting circuits are usually wired in 1mm2 or 1.5mm2 single P.V.C meanwhile, the protecting fuse is generally 5A (20mm tinned copped wired or catudge fuse with while body). In a proper connection, conductors in a lightering final sub circuits. Base on I.E.E. regulation specification, its strongly urge any persons not to connect a final sub-circuit neutral to exceeded more than one final sub-circuit furthermore, each neutral connected to its individual terminal at the neutral block; which bunching is not permitted.
DOMESTIC RING CIRCUIT
The domestic ring circuit is defined in the IEE regulation as “a final sub circuit in which the current carrying and earth continuity conductors are connected in the form of a loop, both ends of which are connected to a single way in a consumer control unit with equivalent. A spur of a ring circuit is a branch cable having conductors of a cross-sectional area not smaller than that of the conductors forming the ring”.
The main IEE regulation relating to the ring are as follows.
CHAPTER THREE
CONSTRUCTION PROCEDURE
INSTALLATION OF CONDUIT
Conduit should be run as straight and direct as possible. When installing conduit, things to note are number of conduit parallel and adjacent to each other in exposed multiple – conduit runs. The standard of an electricians workmanship can be often be judged by the achieved by a systematic approach, constant practice, and a regard for detail. The following paints made the assist the electrician in this filed.
PLANNING THE LAYOUT:- This is considered before starting the actual layout.
- The pipe runs of the other trade should be studies
- The consumer should be sure that all his requirement clearly marked on the architect’s drawing, this saves time.
- Allowances for future extension should be make.
CHAPTER FOUR
OPERATION AND TESTING
The main purpose in testing an installation is to detect faults before dangerous, situation arise;
The main factors against which an installation must be protected are as follows: Earth leakage and danger of electric shock, excess current, moisture and corrosion.
The main test carried out on an electrical installation are as follows
- Verification of polarity tests
- Installation test and
- Earthling tests.
VERIFICATION OF POLARITY TEST
The purpose of the reification of polarity test is to check that the phase conductor is taken through the fire and the switch to the appliance. The reason for this is that the neutral were is earthed at he supply authority’s sub-station. But the neutral is not necessarily ‘dead’ in a system in which the load is unevenly distributed between the three phases (an unbalanced’ system). It is possible to get a shock from the neutral. The neutral must never be broken by a fuse or switch. If the fuse opened up under these condition, then the circuit would still be live. This is illustrated in (fig 1.5) in fig 1.7 the main switch had been correctly wired, but the lamp switch is on the wrong pole. An operator changing he lamp could receive a fatal shock, even with the switch off if accidentally touched the pins of the lamp holder.
CHAPTER FIVE
CONCLUSION
We would now conclude that the design of any electrical installation by taking into account the characteristics of the building, giving insight to the types of electrical utilization the need to flexibility’s and the accessibility of the system.
Considering the fundamental effects, the design procedures is the buildings electrical system.
Finally, the designs should be selected to suit a particular building and reject methods and techniques which are applicable and uneconomical.
RECOMMENDATION
Although there may be ways of control from the three or more position, switches can be used e.g intermediate type in addition to two gang switches, it is necessary in order to reduce the tension of ON and OFF of light from one point.
BILL OF QUANTITY
In any project carried out, it involve money and time, project is not to kept to oneself, due to this, the sum total use was draw out. Aiming at putting close idea of the person who may possibly need the approximate lost of his type of installation work. This is summarized in the table below.
BIBLIOGRAPHY
- Donelly E.L Electrical Installation Theory and Practice, George G. Harrap and Co. Ltd, 1972.
- Edward Hughes Electrical Technology, George G. Harrap Co. Ltd London 17th Edition, 1988
- Theraja B.J, Theraja A.K.A Textbook of Electrical Technology, S. Chand and Company Ltd. Ram Nagar New Delli Raised Edition 2002.