A Guide to BS EN 62305:2006 Protection Against Lightning Part 2 pdf

... IV Current per mode (kA) 25 18.75 12. 5 12. 5 Table 2. 3: Current capability of lightning current SPDs based on 10/350µs waveform 21 www.furse.com BS EN 623 05 -2 BS EN 623 05 -2 Risk management BS EN 623 05 -2 ... 1 and LPZ 2 must respect safety distances d s BS EN 623 05 -2 | Perception of risk 22 BS EN 623 05 -2 Risk management www.furse.com BS EN 623...

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 :20 06 Protection Against Lightning Author’s note The initial reaction from anyone reading, absorbing and...

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 623 05 -2, and also illustrated in this guide. See ... flash density map 28 www.furse.com BS EN 623 05 -2 Risk management Figure 3.5: UK lightning flash density map (BS EN 623 05 -2 Figure NK.1) 27 www.furse.com Flash densi...

Ngày tải lên: 08/08/2014, 13:21

... 40.9 22 .4 29 .0 14.3 27 47 .2 29.1 39.8 22 .4 27 .5 13.9 28 46.4 29 .4 38.7 22 .4 25 .9 13.4 29 45.6 29 .6 37.7 22 .3 24 .4 12. 9 30 44.8 29 .8 36.7 22 .3 22 .8 12. 2 31 44.1 30.0 35.7 22 .2 32 43.3 30.1 34.7 22 .1 33 ... 15.4 22 .8 8.4 21 52. 3 27 .2 46.6 22 .0 36.3 15.4 22 51.3 27 .6 45.5 22 .1 34.8 15.3 23 50.5 27 .9 44.3 22 .2 33.4 15.1 24 49.6 28 .3 43...

Ngày tải lên: 08/08/2014, 13:21

... metallic installations/parts, such 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 ... and SPD selection is given in BS EN 623 05-4 and the relevant section of this guide. BS EN 623 05-3 Physical damage to structures and life hazard BS EN 50164 -2 is...

Ngày tải lên: 08/08/2014, 13:21

... 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 detailed in BS EN ... level Visual inspection (years) Complete inspection (years) Critical systems complete inspection (years) I and II 1 2 1 III and IV 2 4 1 BS EN 623 05-3 Physical damage to...

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 623 04-4 Figure A. 3) Welded ... arrangements when using K S1 as part of the risk evaluation. Similarly K MS (see page 30, Probability of damage) is a factor that is related to the screening effectiveness of...

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 ... location in BS EN 623 05 -2. Throughout this example a numerical subscript will be added to several factors. This subscript will identify the major risk to which the factors rela...

Ngày tải lên: 08/08/2014, 13:21

... gas, water, financial, health etc). With reference to Table NC.6 of BS EN 623 05 -2 the following values have been chosen L f2 = 0.1 for a financial service provider L o2 = 0.01 for a financial ... 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 623 0...

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