A Guide to BS EN 62305:2006 Protection Against Lightning Part 7 doc

... 5 .7 shows a large loop area created between power and data communication cabling. Figure 5 .7: Loop areas Good practice Bad practice Area of loop susceptible to induced voltage Power line Data ... electrode Bonding terminals LPZ 0 B LPZ 0 A Management of an LPMS As detailed in BS EN 62305-3, there is a requirement to routinely maintain and inspect a structural LPS to ensu...

Ngày tải lên: 08/08/2014, 13:21

... physical damage applicable to various classifications of service provider (eg gas, water, financial, health etc). Loss L o2 relates to losses due to failure of internal systems applicable to various ... 1 hour per day and 5 days per week. Therefore: In the absence of any information relating to the time that occupants are in a hazardous place with respect to step and touch poten...

Ngày tải lên: 08/08/2014, 13:21

... the standard. Part 2: Risk management BS EN 62305-2 (part 2) risk management approach, does not concentrate so much on the purely physical damage to a structure caused by a lightning discharge, ... European Union (EU), particularly relating to standardisation. Consequently, any British Standard now published has to be in common agreement with its European equivalent. The UK...

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... 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 ... National Annexes NB, NC, and NH in preference to Annex B, C and H. Additionally Annex NK relates to the inclusion of other national parameters and information. These National Annex t...

Ngày tải lên: 08/08/2014, 13:21

... BS 6651 has a flash density map and a world thunderstorm day's map along with an accompanying table. These have been transferred to BS EN 62305-2, and also illustrated in this guide. See ... increasing importance given to the protection against LEMP (Lightning Electromagnetic Impulse), which can cause immeasurable and irreparable damage (as well as disastrous conseque...

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... termination network Connection to air termination network Reference plane Catenary conductors (air termination) BS EN 62305-3 Physical damage to structures and life hazard h Physical height of catenary conductors above ... 10m apart and if strike plates are used as an alternative, these should be strategically placed over the roof area not more than 5m apart. As modern research on...

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... that in the event of lightning currents flowing, no metallic part is at a different voltage potential with respect to another. If the metallic parts are essentially at the same potential then ... basement/ground level and then every 20m thereafter. A sufficient electrical insulation or ‘separation’ distance should always be maintained between the appropriate metallic installations/p...

Ngày tải lên: 08/08/2014, 13:21

... 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 62305-4 is an integral part of the complete standard. By integral we mean that following a risk assessment as detailed...

Ngày tải lên: 08/08/2014, 13:21

... 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 ... electrical contractor may add a power supply line to external CCTV cameras or car park lightning. As this line is likely to cross an LPZ, suitable protection measures (eg SPD) shou...

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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