A Guide to BS EN 62305:2006 Protection Against Lightning Part 8 ppt

... very easy and become routine in nature to automatically calculate the risks R 1 and R 2 . If it is a listed building or has any cultural importance then R 3 can additionally be calculated at the ... 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,...

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...

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...

Ngày tải lên: 08/08/2014, 13:21

... decided to include an opening paragraph in Annex 'C' which permitted each and every National Committee to assign relevant parameters most applicable to their country. The BSI technical committee ... These National Annex tables are highlighted 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 bro...

Ngày tải lên: 08/08/2014, 13:21

... 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 ... 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 apart...

Ngày tải lên: 08/08/2014, 13:21

... 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 the risk ... basement/ground level and then every 20m thereafter. A sufficient electrical insulation or ‘separation’ distance should always be maintained between the appropriate metallic installatio...

Ngày tải lên: 08/08/2014, 13:21

... 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 in BS EN ... earthing will achieve an area of equal potential, ensuring that electronic equipment is not exposed to differing earth potentials and hence resistive transients. A “Type B” earthin...

Ngày tải lên: 08/08/2014, 13:21

... 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 ensure its designed mechanical and electrical characteristics ... 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...

Ngày tải lên: 08/08/2014, 13:21

... any possible flashover in the event of a lightning discharge striking the air rod. In this case there is sufficient space to maintain a separation distance of 1.5m between each air rod and each ... 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 o...

Ngày tải lên: 08/08/2014, 13:21

... 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