A Guide to BS EN 62305:2006 Protection Against Lightning Part 7 doc
A Guide to BS EN 62305:2006 Protection Against Lightning Part 7 doc
... 5 .7 shows a large loop area created between power anddata communication cabling.Figure 5 .7: Loop areasGood practiceBad practiceArea of loop susceptible to induced voltagePower lineData ... electrodeBondingterminalsLPZ 0BLPZ 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 electricalcharacteristics ... electromagnetic radiation. Powercables can be shielded by metallic conduit or cabletrays, whilst data cables often incorporate an outerbraid that offers effective screening.The screen acts as a...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 9 docx
... physical damageapplicable to various classifications of service provider(eg gas, water, financial, health etc).Loss Lo2relates to losses due to failure of internalsystems applicable to various ... 1 hour per day and 5days per week.Therefore:In the absence of any information relating to the timethat occupants are in a hazardous place with respect to step and touch potentials, Lt1will ... 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 andeach...
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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 managementapproach, does not concentrate so much onthe purely physical damage to a structurecaused by a lightning discharge, ... European Union (EU), particularlyrelating to standardisation. Consequently, any BritishStandard now published has to be in commonagreement with its European equivalent.The UK, as far as standards ... lightning .The approach these new parts impart, are much wider in their view, on protection against lightning, when assessed against BS 6651. A nearby lightning strike will inject a massive currentinto...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 2 pdf
... later in this guide. One of the first changes to realise is that this newapproach to risk management looks at risk in a farbroader sense than merely the physical damage thatcan 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 nationalparameters and information. These National Annextables are ... decided to include an openingparagraph in Annex 'C' which permitted each andevery National Committee to assign relevantparameters most applicable to their country.The BSI technical committee...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 3 pptx
... BS 6651 has a flash density map and a worldthunderstorm day's map along with an accompanyingtable. 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 irreparabledamage (as well as disastrous consequential effects) to ... a 10/350µs waveform) are necessary to divert the partial lightning currents safely to earthand limit the transient overvoltage to prevent possibleflashover. They are therefore an integral part...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 4 pps
... terminationnetworkConnection to air terminationnetworkReference planeCatenary conductors(air termination) BS EN 62305-3 Physical damage to structures and life hazardh Physical height of catenary conductors above ... 10m apart and if strike plates are used as analternative, these should be strategically placed overthe roof area not more than 5m apart.As modern research on lightning inflicted damage hasshown, ... 4. 17. sFigure 4. 17: Application of the protection angle to anisolated free standing mastFigure 4.1 8a: Application of the protection angle method to air rods in a non-isolated systemApplication...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 5 pps
... that in the event of lightning currents flowing, no metallic part is at a differentvoltage potential with respect to another. If themetallic parts are essentially at the same potentialthen ... basement/ground level and then every 20mthereafter. A sufficient electrical insulation or‘separation’ distance should always be maintainedbetween the appropriate metallic installations/parts.Wherever ... A typical application would bewhen certain metal installations need to be isolatedfrom the nearby external down conductors to preventany potential corrosion cells being created. A sparkgap...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 6 pps
... main incoming power lines are generallysubstantial enough to carry partial lightning currents,telecommunication lines have significantly smallercross-sectional areas.Taking this factor into ... currents) as well as radiated electromagneticfield effects. BS EN 62305-4 is an integral part of the completestandard. By integral we mean that following a riskassessment as detailed in BS EN ... rules.Consequently Annex C was introduced into BS 6651only as a strong recommendation/guidance measure.As a result protection was often fitted afterequipment damage was suffered, often throughobligation...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 8 ppt
... documentation.The documentation should be continuously updated,particularly to take account of alterations to thestructure that may require an extension of the LPMS.Summary Damage, degradation ... electrical contractor may add a powersupply line to external CCTV cameras or car park lightning. As this line is likely to cross an LPZ, suitable protection measures (eg SPD) should be employed to ensure ... of this guide takes all theaforementioned information and leads the readerthrough a series of worked examples.In Example 1 and 2 the long hand risk managementcalculations are explained. The...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 10 ppsx
... materials are considered.Suburban environmentArea with a medium density of buildings. ”Town outskirts” is an example of a suburbanenvironment. SurgeTransient wave appearing as overvoltage ... current attains 10% of its peakvalue.Voltage switching type SPDSPD that has a high impedance when no surge ispresent, but can have a sudden change in impedance to a low value in response to a ... (NL)Expected average annual number of dangerous eventsdue to lightning flashes to a service.Number of dangerous events due to flashes to a structure (ND)Expected average annual number of dangerous...
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