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Finally, it is usual for the lightning protection system and main power earths to be interconnected. The earth system should be designed as a whole since the complete installation should rise in potential together, to avoid excessive voltage differences.
From a simple modification to a complete new bespoke item. See – Copper Earthing Mats Ikngsmill For Combatting Step Potentials Problems ii Touch Potential the potential difference during fault conditions between exposed metalwork and a point on the soil surface iii Transfer Potential the potential difference between as insulated cable connected to a remote earth reference and the earth rod A number of factors will determine whether or not a person experiencing any of these potentials will be at risk, and the standards attempt to take these into account to ascertain the limits below which the design will be considered acceptable.
Kingsmill Earthing, Lightning & Surge Protection
At all times consideration must be given to the possibility of side flashing. For instance, if the building is an explosive store then the highest level of protection will be required even if the risk of a strike is low.
The low impedance materials are required to ensure that the lightning energy will flow safely to the ground. Soil resistivity The external dimensions of the structure including any adjacent structures that are electrically connected The flash kngsmill in thunderstorm days per year for the area The type of construction Height above sea level Proximity of other structures such as tall trees The length kinggsmill any overhead cables entering kingsmiill structure.
Traditional taper-pointed air terminals are not as frequently used today but when they are they should be positioned near those points where a strike is most likely to hit the building. These should be a minimum of 9 metre for the whole system. This should be at least 0. History of Kingsmill Earthing. Recently, this has changed towards the approach used in North America.
Since their inception inKingsmill have gone from strength to strength and have developed into one of the industry market leaders – Kingsmill have done this by focusing on service, quality, price, delivery, commitment and kiingsmill.
Any good conductor which forms part of the building structure can be employed as a down conductor with appropriate connection to the air termination and earthing systems.
The principal parts are earthint below. Kingsmill Earthing have been manufacturing excellence since The earth electrodes being positioned near the equipment where a fault current was expected to pass.
Lightning Protection & Earthing – A Brief Guide By Kingsmill Earthing
Each down conductor should also be provided with a test point as a means of isolating the earth electrode for test purposes. For this reason, the earth termination should be bonded to the rest of the earth electrodes. The purpose of the down conductor is to provide the low impedance path from the air termination system to the earth system. Kingsmill products are designed, manufactured and tested to meet rigorous standards ensuring high levels of safety and protection for buildings, people, livestock, content and sensitive electronic equipment.
For down leads not part of the structure, copper earth tapes and aluminium earth tapes are the most widely used materials. There would therefore be a potential difference between them. In the past, it was normal practice to design an earthing system to achieve a certain impedance value.
Lightning Protection & Earthing – A Brief Guide By Kingsmill Earthing
If this potential difference was greater than the breakdown value of the air or material in between, then a side flash could occur resulting in severe damage. For external bonds the cross section of the bonding material should not be less than that of the main conductors.
Down Conductors The purpose of the down conductor is to provide the low impedance path from the air termination system to the earth system. The function of this device is to only connect the earths should the voltage between them rise above a certain value. The code of practice for Protection of Structures against lightning details these and are used to estimate risk. The most common terminations are copper earth rods driven into the ground.
The various standards for earthing provide design limits to be met and together with codes of practice explain how the earthing system can be designed to meet these. A number of factors will determine whether or not a person experiencing any of these potentials will be at risk, and the standards attempt to take these into account to ascertain the limits below which the design will be considered acceptable.
Where practical they should be routed directly from the air termination to the earth system and be spaced symmetrically around the outside walls of the structure.
In general materials used for a lightning conductor are high purity exrthing or aluminium of a similar grade to that used in electrical conductors. These potentials are referred to as: If the building is above 20m in height or of an abnormal risk this distance should be reduced to 10m. There are differences in the design limits applying to consumer installations and to supply industry installations and reference should be made to the correct standard to check the limits which apply in each situation.
In their dedicated workshop, using a combination of high tech machinery and skilled staff Kingsmill Earthing have the ability to engineer or modify product items to your exact requirements. If exposed metalwork such as pipes or ducts etc. These are sometimes PVC sheathed copper earth tapes for aesthetic purposes only. Kingsmill thrive on solving customer products problems. The purpose of a lightning protection system is to shield a building, its occupants and contents from these adverse effects.
Earthing The various standards for earthing provide design limits to be met and together with codes of practice explain how the earthing system can be designed to meet these. There is typically one down conductor for every 20m or part thereof the building perimeter at roof or ground level. However, where this is not desirable for technical reasons, an earth kingwmill equaliser can be installed between them.
KINGSMILL EARTHING, LIGHTNING PROTECTION, SURGE PROTECTION, EARTH BARS, EARTH RODS EARTH CLAMPS
Go back to blog index. Click for more info. Kingsmill are proud to be a UK owned, family run business, located in the heart of the UK and are pleased to say that they have been supplying excellent service into the industry for the last 15 years. Kingsmill Industries UK Ltd are a leading manufacturer and supplier of earthing materials and lightning protection products for the UK and international markets.
The ring conductor is made from copper tape or cable aluminium is not permitted for use below ground and also helps to provide potential equalisation at ground level, in addition to potential grading. Elements of a Lightning Protection System In general materials used for a lightning conductor are high purity copper or aluminium of a similar grade to that used in electrical conductors. An important element in the design of a lightning protection system is the consideration of bonding of exposed metalwork on or near the structure.
The most important difference is that the earthing system is designed to ensure earthig potentials in its vicinity are below appropriate limits. Internal bonds can however be of smaller cross section since they are mainly for equipotential purposes and are unlikely to carry a proportion of the lightning current.