Earthing can be defined as a connection of exposed conductive parts of an electrical circuit to earth in order to protect a user from shock or electrocution. It is carried out by connecting the chassis of the electrical equipment with an earth pin on the main power outlet and then joining the wiring of the building to an electrically solid earth point. The earth point is generally a copper pipe or a stake which is buried deep into the ground.
Earthing, also popularly known as grounding, can be divided into two main categories that are conventional and maintenance free earthing. Conventional earthing can be done using GI Plates, Copper Earthing Pipes, Copper Plates and Cast Iron Plates. Whereas maintenance free earthing is ready made, standardized, scientifically developed, easy to install and has a longer life.
An earthing system defines the electrical potential of the conductors relative to the Earths conductive surface. The earthing system means the bonding a piece of electrical equipment to ground. There are so many things in life which are unpredictable, and some of these can prove potentially fatal if not fully prepared for. The choice of the earthing system can affect the safety and electromagnetic compatibility of the power supply. The electricity supply to our homes may seem like just a few cables coming into our homes supplying us with essential electricity that we use daily. But in truth, as dangerous as the electricity supply is to us, it protects and prevents us from getting electrocuted. An average home's electricity is supplied with different types of earthing depending on the electricity suppliers earthing system. The three main types of earthing arrangements are: TN-C-S, TN-S and TT systems. Less common are IT and TN-C but the most common systems used today in homes are TN-C-S systems.
The earthing system protect us through the supplementary equipotential bonding in our homes that's connected along the earthing conductors to the main earthing terminal at the electricity supply service head which is connected to the electricity service. By connecting all exposed conductive parts and extraneous conductive parts together by means of supplementary bonding, the risk of electrical shock is hugely reduced by eliminating a potential difference between them. This is due to the fact that electricity cannot flow between them. All bonding strap connections must contain a label stating that it forms part of an electrical connection and that it must not be disconnected accidentally.
Your Service Head And Its Earthing System