A Guide to BS EN 62305:2006 Protection Against Lightning Part 10 ppsx
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 ... dangerous events due to flashes near a structure (NM)Expected average annual number of dangerous eventsdue to lightning flashes near a structure.Number of dangerous events due to flashes to a service...
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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
... planeCatenary conductors(air termination) BS EN 62305-3 Physical damage to structures and life hazardh Physical height of catenary conductors above the reference planes Separation distancep Penetration ... sphere radiusCatenary conductors(air termination)Space protected by two parallel catenary conductorsConnection to air terminationnetworkConnection to air terminationnetworkReference planeCatenary ... Protective angle (alpha)s Separation distance49www.furse.comCatenary (or suspended) conductorsOne or more catenary conductors may be utilised to provide a zone of protection over an entire structure....
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 5 pps
... electricalinsulation distance between the metallic parts canavoid dangerous sparking between different metallicparts. BS EN 50164-1 is a performance specification. It attempts to simulate actual ... metallicinstallations/parts, such 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 ... and SPD selection is given in BS EN 62305-4 and the relevant section of this guide. BS EN 62305-3 Physical damage to structures and life hazard BS EN 50164-2 is both a design and in parts a performance...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 6 pps
... 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 ... earthing will achieve an area of equalpotential, ensuring that electronic equipment is notexposed to differing earth potentials and henceresistive transients. A “Type B” earthing arrangement ... thereforethreat) to a system compared to an 8/20µs waveformwith an equivalent peak current. Equipotential bonding SPDs that are designed to handle such 10/ 350µs currents are also known asLightning...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 7 doc
... 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 ... 5.7shows a large loop area created between power anddata communication cabling.Figure 5.7: Loop areasGood practiceBad practiceArea of loop susceptible to induced voltagePower lineData linePower ... 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 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 ... that there are no alterations or additions to an installation, whichmay compromise the effectiveness of the LPMS. Forexample, an electrical contractor may add a powersupply line to external ... strike to the structureInspections at the implementation stages of an LPMSare particularly important, as LEMP protection measures such as equipotential bonding are no longeraccessible after...
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A Guide to BS EN 62305:2006 Protection Against Lightning Part 9 docx
... flashes) in accordance withAnnex A of BS EN 62305-2. The calculated values aresummarised in Table 6.18.Probability of damage Ascertain the probability of each particular type ofdamage occurring ... the absence of any information relating to the timethat occupants are in a hazardous place with respect to step and touch potentials, Lt1will be determined bymultiplying the value taken from ... sufficient space on the roof then theseparation distance can be satisfied and as such nodirect or partial lightning current should betransmitted into the structure via any mechanicalservices...
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