suitable for electrical engineering course - diploma

3. POINTS TO BE CONSIDERED WHILE SELECTING ANY
SYSTEM OF WIRING
1. life of installation
2. future extension or alterations
3. construction of building
4. fire hazards or other special conditions
5. corrosive fumes
6. dampness
7. type of wire and material used
8. nature of load (lighting of power)
9. safety of the system
10. cost of wiring system

4. TYPES OF WIRING
SYSTEMS
 (1) Cleat wiring system :
 Normally VIR/PVC or other
recommended wire is used
 Suitable for temporary wiring only
 Not advisable for permanent home wiring
 Insulated conductors are supported
 on wooden cleats.

5. Types of cleats…………
…1. one groove
…2. two grooves and
…3. three grooves

6. 1. Two cleats are spaced half meter apart
2. The cleats have two halves one
base and the other cap.
3. The cables are placed in the
grooves provided in the base and
then the cap is placed.
4. Both are fixed securely on the
walls by long screws.

7. CLEAT WIRING SYSTEM :
 Only one wire should placed in
one slot.
 While fitting cleats, Make sure
insulation is not pressed badly.
 Not advisable for fixing at
lower height.

13. Advantages of cleat wiring:
1. It is easy to fault detection.
2. It is easy to repair.
3. This is the temporary wiring
system.
4. It is the cheapest for internal
wiring.

14. Disadvantages of cleat wiring:
1.It has a bad appearance.
2.It is not looking good.
3.This wiring system is not safe and
durable.
4.It is a chance to shock or fire.
5.It is not a sustainable wiring system.
6.It is used only low-temperature places.

15. 2. BATTEN WIRING SYSTEMS
1. Wires sheathed in tough rubber(TRS) are used
which are quite flexible.
2. Clipped on wooden battens with brass clips and
fixed on to the walls by flat head screws.
3. Moisture and chemical proof.
4. Suitable for damp climate but not suitable for
outdoor use in sunlight.
5. Suitable for lightning in low voltage installations

20. Advantages
Easy installation and is durable
Lower risk of short circuit.
Cheaper than casing and capping
system of wiring
Gives a good appearance if properly erected.
Disadvantages
Danger of mechanical injury.
Danger of fire hazard.
Should not be exposed to direct sunlight.
Skilled workmen are required

21. VARIOUS SYSTEMS BY WHICH POWER IS
DISTRIBUTED TO THE DOMESTIC CONSUMERS
 Single-phase two-wire system
 Three-phase three-wire system
 Three-phase four-wire system

22. CLEAT WIRING

23. CLEAT WIRING
 Cleat wiring is normally used for temporary
wiring purpose.
 Ex..functions, marriages…etc.
 In this type of wiring vulcanized india
rubber(V.I.R) or polyvinyl chloride(PVC)
insulated wires are used as conductors.
 Wires are held by the help of porcelain cleat which
are placed 6mm off the walls or ceilings.

24. CLEAT WIRING
 As shown in dia. Grooves are provided in the base
portion of the cleat for accommodating the wires.
 wiring is done as shown in figure.

25. CLEAT WIRING
Advantages
Cheapest system of internal wiring
Installation and dismantlement is easy
and quick
Material is recoverable after the
dismantlement
Inspection, alternations and additions
can be easily made
Skill required is little

26. CLEAT WIRING
 Disadvantages
 it is not looking good
 quit temporary and perishes quickly
 wire are exposed to mechanical injury
 oil and smoke are injurious to V.I.R insulation
 not suitable for domestic premises

27. CLEAT WIRING
Field of application
 The wiring of this type is suitable for temporary
installations in dry places.
 This is also accepted where appearance is not so
important and cheapness is the main consideration

28. WOODEN CASING AND CAPPING WIRING
This is one of the cheapest type of wiring
and is commonly used for house wiring.
The cable used in this type of wiring is
either V.I.R or P.V.C or any approved
insulated cables.
Casing consist of V-shaped grooves and is
covered by rectangular strip of teak wood
known as capping.
This type of wiring adopted up to 250 V in
dry places and in places where no risk of
fire.

29. WOODEN CASING AND CAPPING
WIRING

30. WOODEN CASING AND CAPPING WIRING

31. WOODEN CASING AND CAPPING
WIRING
 Advantages
 Better appearance than cleat wiring
 Cheap in cost
 Easy to install and rewire
 Easy to inspect by opening the capping

32. WOODEN CASING AND CAPPING WIRING
Disadvantages
 Not suitable in damp places
 Risk of fire
 This type of wiring can only be used on
surface and can not be concealed in plaster.
 Since it requires better workmanship , labour
cost is more

33. WOODEN CASING AND CAPPING WIRING
Field of application
 This type of wiring is suitable for low voltage domestic
installations in dry places and where there is no risk of
fire hazards