Earth Connection
In EE, ground or earth is that the point of reference in a circuit from which voltages are measured, a standard return path for current, or an immediate physical connection to the world.
Electrical circuits could also be connected to ground (earth) for several reasons.
typically we start with some of the translations of the word
Earth Connection
اتصال الأرض= اتصال أرضي
Jarðtenging
Conexión a tierra
Lidhja e Tokës
Erdungsanschluss
З'єднання Землі
Ceangal Cruinne
Connessione di terra
Conexão à terra
Земна връзка
Uziemienie
Zemljana veza
Dünya bağlantısı
Zemljana veza
Dünya bağlantısı
Zemní spojení
Jordforbindelse
Заземление
Conexiune la pământ
Jordanslutning
Еартх Цоннецтион
חיבור כדור הארץ
اتصال زمین
Connexion à la terre
Maayhteys
Zemaljska veza
Äerdverbindung
Jordforbindelse
पृथ्वी कनेक्शन
Aardverbinding
PAT Testing - Earth Continuity Test
This test is administered on all Class I appliances during PAT Testing. the aim of the test is to see that there's an honest connection between the world pin on the plug and therefore the case of the appliance. an honest connection is defined as having a resistance of but 0.1 ohms (or 100 milliohms).
The Earth Continuity test is sometimes mentioned because of the Earth Bond test or the world Resistance test. In effect, all of them measure that there's an honest connection between the mains plug and therefore the Earth point. the traditional thanks to performing this test is to plug the appliance into a PAT Tester and clip the Test cause an appropriate earth point.
When the test is completed, if the resistance measured is a smaller amount than 0.1 ohms, then there's an honest earth connection and therefore the appliance is taken into account safe. When completing this test during PAT testing, there are a variety of practical things to be taken into consideration.
Earth point on an appliance
In order to hold out this test, it's important in fact to clip the test cause an appropriate earth point. If this is often not done, then there's no return path for the present during PAT testing. this may end in the appliance failing the test.
Finding an appropriate earth point will accompany the experience. it's essential to urge an honest connection to the world point. Rusty metal or scaling on kettle elements may prevent an honest low resistance connection. If this is often the case then rotate the connector and use the teeth of the crocodile clip to scrape away the rust or the scaling to urge an honest connection. it's also acceptable to clip onto a screwdriver and use this to attach to an Earth point.
The Golden Rule is: When testing Earth Continuity if you are doing get a fail initially, don't immediately fail the appliance. confirm you've got an honest connection and check out PAT testing again. If necessary try a special Earth point as not all metal parts could be connected to the earth.
PAT testing - Class I Plastic appliances
On some Class I appliances it's going to not be possible to access an external earth point if the appliance is completely enclosed in plastic. for instance, there are many electric fans in use that fall under this category. This presents us with drag because if we cannot connect the test cause an earth point, there's no circuit made and therefore the Earth Continuity test will fail.
On these appliances, it's important to recognize that their construction makes them safer than conventional Class I metal appliances. also as having an Earth connection, they essentially are enclosed in plastic giving them an additional layer of safety. The thanks to performing PAT testing on these appliances is to still perform the Insulation Resistance Test. If this passes, then record this expires the Equipment Test Record and make a comment to the effect that the world Continuity test couldn't be administered thanks to the plastic enclosure.
PAT Testing - Test Current
The person completing the testing can use one among the 2 options below.
Option 1: Use a test current of 1.5 times the fuse fitted within the plug up to a maximum of 25A. for instance, when testing a kettle with a fuse of 13A, a test current of 25A should be used. This test shouldn't be used thereon or other equipment where there are electronic components in use. the massive currents flowing within the earth conductor has been known to induce surge voltages that have damaged electronic components.
Whilst this test is being administered the cable should be flexed to bring out any obvious faults. this is often a very safe test and may be used on ALL Class I appliances including IT equipment.
Electrocution. Not many of us would remember the word. However, most of you'd remember that electric shock causes death. Electrocution may be a term that describes this lethal condition. The term springs from two words: "electro" and "execution". Electric shocks can have fatal results. A high voltage electric shock can cause death either accidentally or deliberately. There is often nothing more disastrous than being electrocuted by your high-end HiFi device. Even the slightest of shock is enough to ruin the experience. Electricity is not any fun. It kills many of us worldwide per annum. Even a current of 50mA, which is only enough for a coffee wattage lamp, is sufficient enough to cause fibrillation, a chronic condition where your heart muscles pack up. This leads to little or no blood being pumped, and therefore the person can die within 3 minutes if medical assistance is immediately not made available.
Would you wish if your high-end HiFi during which you've got spent such a lot of time and money would prove fatal for you? Obviously not. so as to avoid getting electrocuted, also to guard your device against electrical hiccups, earthing or connecting your high-end HiFi equipment with the world (ground) is important. Earthing is completed to make sure that the electrical types of equipment are safe and don't experience electrical accidents. Even your high-end hi-fi dealer also will instruct you to ground your system with the world while installing it and before using it.
The basic idea of earthing or grounding is that the case or chassis of the high-end hi-fi equipment is connected to an earth pin on the mains outlet. This connection is but connected through the house wiring and switchboard to a solid earth point, which is electrically solid. the world point is usually either a copper pipe or a stake buried deep into the world or ground. If just in case any fault develops within the equipment, or there's an important flow of electricity from the mains, the active, also referred to as the live conductor comes into contact with the chassis. this may make the faulty current will flow to the world and therefore the main switchboard fuse or the breaker will blow. Having grounded your expensive HiFi equipment, you would like not to worry about the security, because the safe connection protects you from the slightest of electrical shock, thereby bypassing the fatal electricity flow on to the earth, instead of through your body.
No comments