Fig. 7.8. shows an electric locomotive. It collects current from overhead equipment through sliding contact by means of a pantograph. The air circuit breaker is provided on the roof of the locomotive and its main function is to disconnect the locomotive from high voltage supply. Various Components of Electric Locomotive: 1. Over-head supply line 2. Pantograph 3. Circuit breaker. 4. [...]
In this article we will discuss about the functions of electric multiple unit and metro railways. Electric Multiple Unit (EMU): An Electric Multiple unit or EMU is a multiple unit train powered by electricity. The cars that form a complete EMU set can usually be separated by function into these four types. Power car, Motor car, Driving car and Trailer [...]
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 [...]
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 [...]