A Guide to BS EN 62305:2006 Protection Against Lightning Part 1 potx

... 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, ... countries’ representatives, have to withdraw all their conflicting National Standards (ie BS 66 51) in favour of the EN standard. This will occur at the end of August 2008. 11...

Ngày tải lên: 08/08/2014, 13:21

... at risk in a far broader sense than merely the physical damage that can be caused to a structure by a lightning discharge. BS EN 62305-2 Risk management BS EN 62305 -1 | Type of loss 14 www.furse.com Type ... national parameters and information. These National Annex tables are highlighted later in this guide. One of the first changes to realise is that this new approa...

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 62305-2, and also illustrated in this guide. See ... a 10 /350µs waveform) are necessary to divert the partial lightning currents safely to earth and limit the transient overvoltage to prevent possible flashover. They are...

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... angle (Class of LPS), the spacing between the air rods and the height above a particular reference plane. See Figure 4 .18 b. 21 Figure 4 .18 b: View on arrow A BS EN 62305-3 | Catenary (or suspended) ... parallel catenary conductors Connection to air termination network Connection to air termination network Reference plane Catenary conductors (air termination) BS EN 62305...

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... is a sufficient electrical insulation distance between the metallic parts can avoid dangerous sparking between different metallic parts. BS EN 5 016 4 -1 is a performance specification. It attempts ... 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 metall...

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... rules. Consequently Annex C was introduced into BS 66 51 only as a strong recommendation/guidance measure. As a result protection was often fitted after equipment damage was suffered, often through obligation ... 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 as...

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... 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 the shields at the ... serial data transmission. Figure 5 .15 illustrates the same scenario, but protection is achieved with overvoltage SPDs (1/ 2). The use of SPDs in this way generally presents a more pract...

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... examples Table 6 .12 : Characteristics of Zone Z 1 (Entrance area) Parameter Comment Symbol Value Soil surface type Marble r a 1 x 10 -3 Shock protection None P A 1 Loss by touch and step voltages Yes L t 1 ... documentation. The documentation should be continuously updated, particularly to take account of alterations to the structure that may require an extension of the L...

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... x 10 -7 2.568 x 10 -6 R U1(P) N /A N /A 1. 004 x 10 -14 8.035 x 10 -13 7.0 31 x 10 -15 8.206 x 10 -13 R U1(T) N /A N /A 1. 585 x 10 -14 1. 268 x 10 -12 1. 110 x 10 -14 1. 295 x 10 -12 R V1(P) N /A ... 10 -5 R Z2(P) N /A N /A 1. 1 71 x 10 -5 1. 1 71 x 10 -5 1. 1 71 x 10 -5 3. 513 x 10 -5 R Z2(T) N /A N /A 4.477 x 1...

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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 r...

Ngày tải lên: 08/08/2014, 13:21