LIGHTNINGPROTECTION LIGHTNING PROTECTION SYSTEM DESIGN CONSIDERATIONS
Downconductorrecommendationsinclude
• Conductorsshouldbefixedtothestructureevery1m(approx.)
• Every down conductor must be directed to an earth termination. It is
recommended to equipotentialise all the down conductors at ground level and
every20m.
• It is advisable to include a disconnecting link near the base of each down
conductortoexcludeotherconductiveelementswhenmeasuringearthresistance.
• Itisrecommendedlessthan10Ωforlightningprotectionsystemearthing
resistance.
• Earthconductorsshouldbeburiedtoadepthofatleast0.5m.
• It is not recommended to install aluminium conductors or components directly
intoearth.
• Connections between copper and aluminium conductors or copper and
galvanisedsteelconductorsarenotrecommendedastheyleadtocorrosion.To
joinsuchelementsbimetallicconnectorsorstainlesssteelclampsshouldbeused.
External lightning protection
system elements
• Air termination network (Air rods/finials and/or meshed conductors): intercept
lightningstrikestothestructure.
• Downconductors(metaltapes,cable,circularrange):conductslightningcurrent
safelytowardstheearth.
• Earth termination system (conductive concrete, earth rods, lattice mats, bare
cables):disperseslightningcurrentintothestrataoftheearth.
Internallightningprotectionsystemelements
• Acorrectsurgeprotectioninstallation
• Othermeasuresminimizingthedestructivelightningeffects(equipotentialbonding,
structuralscreening,etc.)
‘Natural’ components: Natural components of the structure are those made of
conductivematerialssuchas:reinforcedconcretestructures,metalsheetscovering
thestructures,etc.whichmaybeabletoenhancetheperformanceofthelightning
protectionsystem,whilstenhancingthebondingregime.
86 a4+44(0)1159757600 www.fmsudafix.com
Page 1  |  Page 2  |  Page 3  |  Page 4  |  Page 5  |  Page 6  |  Page 7  |  Page 8  |  Page 9  |  Page 10  |  Page 11  |  Page 12  |  Page 13  |  Page 14  |  Page 15  |  Page 16  |  Page 17  |  Page 18  |  Page 19  |  Page 20  |  Page 21  |  Page 22  |  Page 23  |  Page 24  |  Page 25  |  Page 26  |  Page 27  |  Page 28  |  Page 29  |  Page 30  |  Page 31  |  Page 32  |  Page 33  |  Page 34  |  Page 35  |  Page 36  |  Page 37  |  Page 38  |  Page 39  |  Page 40  |  Page 41  |  Page 42  |  Page 43  |  Page 44  |  Page 45  |  Page 46  |  Page 47  |  Page 48  |  Page 49  |  Page 50  |  Page 51  |  Page 52  |  Page 53  |  Page 54  |  Page 55  |  Page 56  |  Page 57  |  Page 58  |  Page 59  |  Page 60  |  Page 61  |  Page 62  |  Page 63  |  Page 64  |  Page 65  |  Page 66  |  Page 67  |  Page 68  |  Page 69  |  Page 70  |  Page 71  |  Page 72  |  Page 73  |  Page 74  |  Page 75  |  Page 76  |  Page 77  |  Page 78  |  Page 79  |  Page 80  |  Page 81  |  Page 82  |  Page 83  |  Page 84  |  Page 85  |  Page 86  |  Page 87  |  Page 88  |  Page 89  |  Page 90  |  Page 91  |  Page 92  |  Page 93  |  Page 94  |  Page 95  |  Page 96  |  Page 97  |  Page 98  |  Page 99  |  Page 100  |  Page 101  |  Page 102  |  Page 103  |  Page 104  |  Page 105  |  Page 106  |  Page 107  |  Page 108  |  Page 109  |  Page 110  |  Page 111  |  Page 112