A Guide to BS EN 62305:2006 Protection Against Lightning Part 6 pps

... main incoming power lines are generally substantial enough to carry partial lightning currents, telecommunication lines have significantly smaller cross-sectional areas. Taking this factor into ... currents) as well as radiated electromagnetic field effects. BS EN 62 305-4 is an integral part of the complete standard. By integral we mean that following a risk assessment as detail...

Ngày tải lên: 08/08/2014, 13:21

... termination network Connection to air termination network Reference plane Catenary conductors (air termination) BS EN 62 305-3 Physical damage to structures and life hazard h Physical height of catenary conductors above ... be spaced not more than 10m apart and if strike plates are used as an alternative, these should be strategically placed over the roof area not more than 5m apa...

Ngày tải lên: 08/08/2014, 13:21

... and SPD selection is given in BS EN 62 305-4 and the relevant section of this guide. BS EN 62 305-3 Physical damage to structures and life hazard BS EN 50 164 -2 is both a design and in parts a performance ... metallic installations/parts, such that in the event of lightning currents flowing, no metallic part is at a different voltage potential with respect to an...

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... materials are considered. Suburban environment Area with a medium density of buildings. ”Town outskirts” is an example of a suburban environment. Surge Transient wave appearing as overvoltage ... current attains 10% of its peak value. Voltage switching type SPD SPD that has a high impedance when no surge is present, but can have a sudden change in impedance to a low value in res...

Ngày tải lên: 08/08/2014, 13:21

... Lightning 2 www.furse.com A Guide to BS EN 62 305:20 06 Protection Against Lightning Author’s note The initial reaction from anyone reading, absorbing and comparing this new four -part BS EN 62 305 with BS 66 51 will ... the standard. Part 2: Risk management BS EN 62 305-2 (part 2) risk management approach, does not concentrate so much on the purely phys...

Ngày tải lên: 08/08/2014, 13:21

... later in this guide. One of the first changes to realise is that this new approach to risk management looks at risk in a far broader sense than merely the physical damage that can be caused to ... method adopted for the implementation of managing risk relevant to lightning protection is significantly more extensive and in depth than that of BS 66 51. Many more parameters ar...

Ngày tải lên: 08/08/2014, 13:21

... to BS 66 51 has a flash density map and a world thunderstorm day's map along with an accompanying table. These have been transferred to BS EN 62 305-2, and also illustrated in this guide. ... increasing importance given to the protection against LEMP (Lightning Electromagnetic Impulse), which can cause immeasurable and irreparable damage (as well as disastrous con...

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... electrode Bonding terminals LPZ 0 B LPZ 0 A Management of an LPMS As detailed in BS EN 62 305-3, there is a requirement to routinely maintain and inspect a structural LPS to ensure its designed mechanical and electrical characteristics ... 5.5: Ideal Faraday Cage Lightning current Continuous metal box - ideal Faraday Cage Figure 5 .6: Large volume shield created by metal rei...

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... documentation. The documentation should be continuously updated, particularly to take account of alterations to the structure that may require an extension of the LPMS. Summary Damage, degradation ... that there are no alterations or additions to an installation, which may compromise the effectiveness of the LPMS. For example, an electrical contractor may add a power supply line to...

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... calculated values are summarised in Table 6. 18. Probability of damage Ascertain the probability of each particular type of damage occurring in the structure in accordance with Annex NB of BS EN 62 305-2. ... given in tabular form. Collection areas Calculate the collection areas of the structure and the power and telecom lines in accordance with Annex A of BS EN 62 305-2. The c...

Ngày tải lên: 08/08/2014, 13:21