SURGE PROTECTION AND LIGHTNING PROTECTION SYSTEMS SURGEPROTECTION
Surgeprotectionandlightningprotectionsystems
Surge protection has always been closely linked to lightning protection AphilosophywhichunderpinsthewholeofBSEN62305isthatoflightning
systems due to the logical link between the management of, and protection protectionzones.Theconceptisthatanycomplex,facility,buildingorroomcan
against, substantial fault currents. It is pertinent to consider that a structure besplitintozoneswhichhavedifferentrequirementsforlightningprotection,and
is usually at greater threat from lightning surge current damage than from thenappropriateprotectionmeasurescanbebrokendownintothatparticular
the threat of a direct lightning strike. zone.Abuildingmayhaveanexternallightningprotectionsystemthatwillstop
The previous iteration of the lightning protection standard, BS 6651, held
thebuildingfrombeingdamaged,orcatchingfire.Insidethebuildingtheremay
informationonintegratingsurgeprotectiondeviceswithinanappendix;however
beequipmentsuchasacomputerserverwithinadedicatedroom.Theserver
BSEN(IEC)62305nowholdssurgeprotectionasadistinctaspectofthe
willneedfurtherprotectiontoensurethatitisprotectedfromsurges,therefore
standard(part4),whichmustbeaddressedinanystructurethatclaimstobe
beingalightningprotectionzone,withinalightningprotectionzone.Itisalways
compliantwiththisstandard.BSEN(IEC)62305-4recommendsanumberof
worthrememberingtoattempttosurgeprotectlocallytoequipmenttoensure
methodstoprotectagainsttransientovervoltagescausedbylightning,suchas thatitismanagedeffectively,andtoavoidallowingfaultcurrentsinducting
effectiveearthingandbonding,electromagneticshieldingandlinerouting,and downstreamofthesurgeprotectiondevice.
importantly coordinated surge protection devices; these measures directly
Surgescancarrythroughdata,powerandtelephonelinesanditisprudentto
impactontheperformanceoftheinternalmeasuresofalightningprotection
installsurgeprotectionmeasuresonthelocalpowersupplytovitalequipment,
system.Thefunctionoftheinternallightningprotectionsystemistoprevent
anyelectronicequipmentoutsidethemainstructure;particularattentionshould
dangeroussparkingbetweenareasofdifferingelectricalpotentials,andto
begiventocableswhichpenetratetheexternalenvelopeofthestructure.
preventthefaultcurrentscausingdamageintheformoffires,explosionsor
ExamplesofsuchitemscanincludeCCTVsystems,airhandlingunits,power,
equipmentdamage.
data and telecom lines,
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