ILEKTECH

Low Voltage Switchgear involves switches like power circuits, relays etc. It is important that a periodic inspection and test carried out at least every 1-2 years and 2-6 months when new equipment is installed. In this section we discuss about some guidelines for inspection and maintenance of low voltage switch gear 1)       On energized equipment                              Three things you must do a)       Listen for popping, spitting or cracking sound produced by the electrical discharges-also humming and vibrations produced by the resonance b)       Look for corona halos c)       Check for ozone – ozone is produced by corona or overheating of organic materials 2)       On de-energized equipment’s Three things you must do a)       Check and co...

It is recommends that a periodic inspection and test of the electrical installation should be carried out by a registered electrician at least every five year. The electrical works should meets the national standards “You should never try to carry out your own electrical repairs” However, there are number of simple, visual checks that you can carry out yourself 1)       Check your RCD protection in your fuse-box 2)       Make sure that your plug sockets are not overloaded 3)       Ensure that plugs and sockets are not damaged 4)       Check that visible cables and leads are in good conditions 5)       Check that your light fittings are not visibly damaged and that down-lighters are in good working condition 6)       Check that you are not storing combustible materials around your fuse-box, electric meter or electr...

1)       Earthing electrode should be placed at least one and half meter  away from the building 2)       Earth wire should be same material with earth electrode 3)       The minimum sectional area of earth wire should be greater than 0.02 sq. inch and less than 0.1 sq. inch 4)       The size of earth conductor should not be less than half of the section of a line conductor 5)       The earth electrode should be taken as GI pipe with minimum diameter of 12 mm and at least 32 cm length 6)       Coal and salt mixture with loose soil should be filled around the earth electrode 7)       All the earth wire run along with the sub-circuits should be terminated hooked firmly at the main board 8)       The earth resistance should be low enough to flow of current sufficient to op...

1)      Check the condition of your wiring. This should be done when you move into a new home and then once every 10 years.  It’s the lan dlord’s responsibility if you rent your home. Ask to see a copy of the certificate or report confirming that the electrics meet the standards (Requirements for Electrical Installations) 2) Check your sockets regularly. If you see burn marks or they feel hot, get a registered electrician to check them. 3) Turn off any electrical equipment you are not using. This especially important at night, there is a chance of fire that can spread quickly while you sleep. 4) Regularly check flexible cables on your appliances. Look for signs of fraying, general wear and tear, or a loose plug on kettles on similar appliances. Do this before you plug anything in. 5) Careful when using hand-held electrical equipment. Make sure you switch off and unplug this equipment when you have finished with it. This is important with items that get hot...

Insulators are substance which does not readily conduct electricity or Insulators are those substances which offer such a huge resistance. Di-electric strength is the term used for comparing insulation property of an insulator.   Properties An ideal insulator has the following properties a)       High Resistivity Insulators are those substances which offer such a huge resistance, that they allow practically no electricity. b)       Di-electric strength All insulator conduct electricity if subjected to apply extreme voltage. The voltage at which the material lost his insulating property is known as di-electric strength or breakdown voltage. c)       Mechanical strength The insulating material must be mechanically strong enough to carry tension and weight of conductor d)      Ability to withstand moisture Their must not be any entrance on the surface of electrical in...

A generator is a machine which converts the mechanical energy into electrical energy. It works on the principle of Faraday's law of electromagnetic induction. DC Generators produce the direct current. Ordinary generator working             The figure shows two pole and one coil generator, two slip rings are connected with the two terminals of the coil.  Figure 1: The coil is at 90 degree to the field, there will be no cutting of flux so no emf is produced Figure 2: The coil sides are parallel to the field; hence maximum emf will be induced Figure 3: The coil is in the same position as in figure 1, but ab side is downwards and cd is upwards, there is no voltage will be induced. Figure 4: It is similar to figure 2, maximum emf is induced but in the reverse direction. Figure 5: In this way a cycle of ac voltage is completed.  Commutation Commutation in a dc machine is the process of converting alternating c...

Conductors are materials with electrons are loosely bound to their atoms or materials that permit free motion of a large number of electrons. Atoms with only one valance electron such as copper, silver, gold are examples of good conductors. Most of the metals are good conductors Properties of electrical conductors             In equilibrium condition the conductors exhibit the following properties a)       Resistance Conductors are those substances which offer such a small resistance b)       Inductance When a conductor is used as ac supply a magnetic flux is produced, which consist of two parts. One is internal flux and other is external flux. The internal flux is very low as compare to external flux. Due to this flux linkage to the conductor itself an inductance is come into picture. This inductance results in extra voltage drop in conductors. More over this induct...