2020. 3. 2. 08:07ㆍ카테고리 없음
. Earth Continuity Conductor. Earthing Lead. Earth ElectrodeComponents of Electrical Earthing System Earth Continuity Conductor or Earth WireThat part of the earthing system which interconnects the overall metallic parts of electrical installation e.g.
- Method Statement Earthing System Installation Instructions
- Method Statement For Earthing System Installation Pdf
- Earthing System Conductor
Conduit, ducts, boxes, metallic shells of the switches, distribution boards, fuses, Regulating and controlling devices, metallic parts of electrical machines such as, motors, generators, transformers and the metallic framework where electrical devices and components are installed is known as earth wire or earth continuity conductor as shown in the above fig. First of all, dig a 5x5ft (1.5×1.5m) pit about 20-30ft (6-9 meters) in the ground.
(Note that, depth and width depends on the nature and structure of the ground). Bury an appropriate (usually 2’ x 2’ x 1/8” (600x600x300 mm) copper plate in that pit in vertical position. Tight earth lead through nut bolts from two different places on earth plate. Use two earth leads with each earth plate (in case of two earth plates) and tight them. To protect the joints from corrosion, put grease around it.
Collect all the wires in a metallic pipe from the earth electrode(s). Make sure the pipe is 1ft (30cm) above the surface of the ground. To maintain the moisture condition around the earth plate, put a 1ft (30cm) layer of powdered charcoal (powdered wood coal) and lime mixture around the earth plate of around the earth plate. Use thimble and nut bolts to connect tightly wires to the bed plates of machines. Each machine should be earthed from two different places. The minimum distance between two earth electrodes should be 10 ft (3m).
Earth continuity conductor which is connected to the body and metallic parts of all installation should be tightly connected to earth lead. Make sure to use the continuity by using. At last (but not least), test the overall earthing system through earth tester. If everything is going about the planning, then fill the pit with soil.
The maximum allowable resistance for earthing is 1Ω. If it is more than 1 ohm, then increase the size (not length) of earth lead and earth continuity conductors. Keep the external ends of the pipes open and put the water time to time to maintain the moisture condition around the earth electrode which is important for the better earthing system.SI specification for EarthingVarious specifications in respect to earthing as recommended by Indian Standards are given below.
Method Statement Earthing System Installation Instructions
Here are few. An earthing electrode should not be situated (installed) close to the building whose installation system is being earthed at least more than 1.5m away. The earth resistance should be low enough to cause the flow of current sufficient to operate the protective relays or blow fuses. It’s value is not constant as it varies with weather because it depends on moisture (but should not be less than 1 Ohm). The earth wire and earth electrode will be the same material.
Method Statement For Earthing System Installation Pdf
The earthing electrode should always be placed in a vertical position inside the earth or pit so that it may be in contact with all the different earth layers.Related Posts. To avoid electric shock. To avoid risk of fire as a result of earth leakage current through unwanted path and.
To ensure that no current carrying conductor rises to a potential with respect to general mass of earth than its designed insulation.However, if excessive current is not earthed, appliances will be damaged without the help of fuse in place. You should note that excessive current are earthed at their generating stations which is why earth wires carries very little or no current at all. It therefore implies that it is not necessary to earth any of the wires (live, earth and neutral wires) contained in a PVC.
Earthing the live wire is catastrophic. Respected Sir,In the existing theory of electrical earthing the fate of electrons after it reaches the earth through earthing/ground rod remain unidentified.We have shown that the electrons after reaching the earth/ground through the grounding rods are actually transported to the source through orientations of water molecules. Kindly see the links and post your valuable suggestion:1)“The Phenomenon of Electrical Earthing Explained”2)“Delocalization of hydrated electron conducts”Thanking you.Biplab Chakraborty. Engineering Experts,I have a question regarding the Earth Continuity Conductor Sizing for a residential house.As you said here “The cross sectional area of the Earth Continuity Conductor should not be less than the half of the cross sectional area of the thickest wire used in the electrical wiring installation.”Per this, would the below statements be a safe design consideration for a residential house with 3 Ph Supply & load of 6kW with 40A main Isolator & ELCB.1. For 2 Ton AC Circuit & Load of 8 Amps. 4 mm flexible wire used for Phase & Neutral.Earthing Wire used is 2.5 mm2. For Power Socket with upto 1500W load.
Earthing System Conductor
2.5 mm wire used for Phase & neutral.Earthing Wire used is 1.5 mm3. For other circuits: 1.5 mm wire used for Phase & Neutral.Earthing Wire used is 1.5 mmKindly help me with the earthing continuity conductor sizing query.