A Guide to BS EN 62305:2006 Protection Against Lightning Part 5 pps

... or ‘separation’ distance should always be maintained between the appropriate metallic installations/parts. Wherever protection of internal systems against overvoltages caused by a lightning discharge ... requirements of BS EN 50 164-2. BS EN 50 164-3 covers the application of spark gaps when used in an LPS. A typical application would be when certain metal installations ne...

Ngày tải lên: 08/08/2014, 13:21

... conductors (air termination) BS EN 623 05- 3 Physical damage to structures and life hazard h Physical height of catenary conductors above the reference plane s Separation distance p Penetration ... 10.2 14 59 .6 23.8 55 .4 20.3 47.0 14.9 35. 8 10.1 15 58.4 24.4 54 .1 20.6 45. 4 15. 1 33.6 10.0 16 57 .3 24.9 52 .8 20.9 43.8 15. 2 31.4 9.8 17 56 .2 25. 4 51 .5 21.2 42.3 15. 3 2...

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 623 05- 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

... 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

... the standard. Part 2: Risk management BS EN 623 05- 2 (part 2) risk management approach, does not concentrate so much on the purely physical damage to a structure caused by a lightning discharge, ... Lightning 2 www.furse.com A Guide to BS EN 623 05: 2006 Protection Against Lightning Author’s note The initial reaction from anyone reading, absorbing and compa...

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 ... 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

... to BS 6 651 has a flash density map and a world thunderstorm day's map along with an accompanying table. These have been transferred to BS EN 623 05- 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...

Ngày tải lên: 08/08/2014, 13:21

... 5. 5: Ideal Faraday Cage Lightning current Continuous metal box - ideal Faraday Cage Figure 5. 6: Large volume shield created by metal reinforcement within a structure (BS EN 62304-4 Figure A. 3) Welded ... capturing lightning energy and should therefore be avoided. Figure 5. 7 shows a large loop area created between power and data communication cabling. Figure 5. 7: Loop area...

Ngày tải lên: 08/08/2014, 13:21

... 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

... 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 ... – Summary of collection areas Symbol Area (m 2 ) A d/b 12 ,56 1.73 A m 227,149 .5 A l(P) 9 ,56 5.89 A l(T) 15, 099.88 A i(P) 256 ,9 35. 1 A i(T) 3 95, 284.7 Table 6.19: Exam...

Ngày tải lên: 08/08/2014, 13:21