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 [...]
The following points highlight the eleven most commonly used wiring accessories. The accessories are: 1. Switch 2. Fuses or Cut-Outs 3. Ceiling Rose 4. Lamp Holder 5. Wall-Plug or Socket-Outlet 6. Adapter 7. Distribution Fuse Board or Distribution Board 8. Power Distribution Board 9. Busbar Chamber 10. Busbar Trunking 11. Rising Main. Accessory # 1. Switch: A switch is a [...]
For burning a lamp, for running a fan or for giving supply to the armature of a d.c. motor, two wires are necessary. Through one wire the current enters into the machine or apparatus. This wire is called positive (+) wire. Through the other wire the current returns back to the supply source. This wire is called negative (-) wire. [...]
The following points highlight the three different metals used as fuse wire. The metals are: 1. Silver as Fuse-Wire 2. Copper as Fuse-Wire 3. Lead-Tin Alloy as Fuse-Wire. Metal # 1. Silver as Fuse-Wire: For fuse wires silver is quite satisfactory material. It is not subjected to oxidization as its oxide is unstable. The metal does not deteriorate when used [...]
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 [...]