In this article we will discuss about:- 1. Types of Switches 2. The Essential Qualities of a Switch 3. Positions. Types of Switches: i. Quick Break Knife Switch: This type of switch is generally used on the main switch board of a low voltage circuit. Fig. 76 shows a double pole quick break knife switch. The switch consists of one, [...]
The following points highlight the four different types of cut outs found in a fuse-wire. The types are: 1. Grip Fuse 2. Totally Enclosed Fuse 3. Cartridge Fuse 4. High Rupturing Capacity Fuse or H.R.C. Fuse. Type # 1. Grip Fuse: It is a semi-enclosed type of use. The fuse-wire in this type of fuse is neither totally enclosed nor [...]
Conductors should be visible all throughout a cleat wiring. In temporary installations wiring is often done over bobbin or knob insulators in place of cleats. Whenever the wires pass through a floor or through a space where some damage is apprehended, they should be provided with an additional protection of a special strong covering up to a height of 1.5 [...]
When the sheath of C.T.S. cable made of rubber or some other compound mixed with rubber remains exposed to direct sunlight, arrangement must be provided to cover it up properly. It should, however, be noted that when sunlight comes through the glass of a window,-it is not regarded as direct sunlight. Where weather proof or lead-sheathed cable is to be [...]
The following points highlight the nine main systems usually adopted for house wiring. The systems are: 1. Cleat Wiring 2. Casing Wiring 3. Looping-in-System of Wiring 4. Conduit Wiring 5. Concealed Wiring 6. Metal-Sheathed Wiring or Lead-Covered Wiring 7. C.T.S. or T.R.S. Wiring 8. P.V.C. Sheathed Wiring 9. M.I.C System. 1. Cleat Wiring: Cleat wiring is the cheapest method of [...]
In this article we will discuss about the procedure for installation of metal-sheathed wiring. At first wooden plugs or rawl plugs or phil plugs are grouted in the wall at intervals not exceeding 75 cm (2 ½’). On to each plug suitably wide, polished, hard wood battens of thickness at least 10 mm (⅜") are screwed. The lead-covered cable is [...]
Conduit Wiring is the best system of wiring. There are two methods for laying conduits. In one method conduit is laid on the surface of the wall, ceiling etc. This is called surface wiring. The other method is to lay the conduit recessed in wall or ceiling, and this system is known as concealed wiring. Conduit may be rigid or [...]
Casing wiring is generally adopted for low pressure installations. Here V.I.R. wires or P.V.C. wires are laid in grooves. The two main disadvantages of this system of wiring are: (i) Very good workmanship is required to make the job perfect, and this results in costlier installation. (ii) There is every risk of fire from wood. Casing generally used for installation [...]
In this article we will discuss about the tests that are carried out while the house electrical wiring is in progress and also after the same is completed. Tests Carried out While the House Electrical Wiring is in Progress: (a) Continuity Test of Wiring: When there is some progress in electrical wiring, electrical continuity among different lengths of wires and [...]
The following points highlight the seven major faults that occur in wiring system with remedies to fix the same. The faults are: 1. Lamp does not Light Up 2. When Light up Lamps are Over Bright or Under Bright 3. Wiring System is Excessively Heated 4. Leakage in the Wiring System 5. Defects in Fluorescent Lamp Circuits and Corresponding Remedies [...]