Most of the boilers are fitted with accessories. They either increase the efficiency of the boiler plants or help in their working. The following accessories are attached to a modern boiler: Boiler Accessory # 1. Economizers: The greatest item of heat loss in a boiler plant is the heat carried away in the flue gases up the chimney or stack. [...]
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 [...]
In this article we will discuss about the use of various types of switches for domestic and commercial purposes. Use of Single-Pole and Double-Pole Switches: A single-pole switch may be used in a circuit in which normally the current does not exceed 5 amperes. Where the current exceeds 5 amperes, the practice is to use a double-pole switch there. When [...]
The following points highlight the six main types of insulators generally used in low or medium voltage. The types are: 1. Pin Insulators 2. Shackle Insulators 3. Stay-Insulators or Guy-Insulators 4. Reel Insulators 5. Egg-Type Insulators 6. Aerial Fuse. Type # 1. Pin Insulators: An insulator set on a pin or a bolt is called a 'pin insulator'. Both ends [...]