LIGHTNINGPROTECTION EARLY STREAM EMITTING DEVICES
EarlyStreamEmittingDevices(ESEDevices)
WhilstFMSudafixrecommendspursuingacompletelightningprotectionsystemtoBS
ENIEC62305,shouldourcustomersrequireanESEsolutionthereisarangeofoptions.
All information that follows is intended to elucidate the protection approach of ESE
devices and is not provided for the purposes of design or advice. The theory
underpinningtheperformanceofESEdevicesisbasedupontheelectriccharacteristics
of lightning formation. Lightning initiates with a downward leader, propagating to any
direction. Once it descends within influential range of objects on the ground, any of
themcanbestruck.Theobjectiveofanexternallightingprotectionsystemistocontrol
the lightning striking point thus providing the lightning current a path to the ground
withoutdamagingthestructure.ThemainfeatureofESEdevicesistheemissionofthe The Dat Controler® Plus is designed to meet the
continuous upward leader before any other object within is protected area. The
following performance criteria:
standards define this characteristic using a parameter called advance time (Δt). The
Protectionradius(inm)
advance time determines the protection radius of each air terminal. If the triggering
occursearlier,thenthedistancewherethedownwardleaderisinterceptedincreases,
4protection 3protection DatControler®Plus
levels levels
thusavoidingthelightningstrikeinawiderarea. (CTE,…) (UNE21186,
NFC17102..)
• The protection radius of an ESE device is related to its height relative to the area
H DC+15 DC+30 DC+45 DC+60
intendedtobeprotected.
LevelIV LevelIII 2 20 28 36 43
• TheESEairterminalmustbeinstalledatleast2mhigherthananyotherelementwithin
4 41 57 72 85
itsprotectedarea.
6 52 72 90 107
• AnyinstallationofanESEdevicemustbeundertakenwithgreatcareasESEdevices
8 54 73 91 108
10 56 75 92 109
need to be able to maintain performance in all types of weather conditions; any
LevelIII LevelII 2 18 25 32 39
damage leading to rain ingress could short-circuit the ESE device and render it
4 36 51 64 78
ineffective.
6 46 64 81 97
• Each ESE device must be connected to the earthing using an external down
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conductor. Two or more down conductors are needed for structures over 28m in
10 49 66 83 99
height,andwhenthehorizontalpartofthedownconductorislargerthanthevertical
LevelII 2 15 22 28 35
part.
4 30 44 57 69
• Eachdownconductormusthavealowinductanceearthterminationsystem,which 6 38 55 71 87
isorientedawayfromthestructureandhasalowerresistancethan10Ω. 8 39 56 72 87
• 3fixingclipsshouldbeinstalledforeverymetreofdownconductor.
10 40 57 72 88
• Downconductorsmustnotcomewithin3mofexternalgaspipes.
LevelI LevelI 2 13 19 25 31
• Down conductors should have a cross-section of at least 50mm². Since lightning
4 25 38 51 63
currentisimpulsionalthenflatconductors(tape)arepreferablethanroundconductors
6 32 48 63 79
becausetheyhavealargersurfaceforthesameamountofmaterial.
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• The Dat Controler®Plus ESE devices have gained AENOR product quality seal
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ofcertification.
H:airterminalheightoverthesurfacetobeprotected.
96 a4+44(0)1159757600 www.fmsudafix.com
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