LIGHTNING PROTECTION EARLY STREAM EMITTING DEVICES
Early StreamEmittingDevices (ESEDevices)
Whilst FMSudafix recommends pursuing a complete lightning protection systemto BS ENIEC62305, should our customers require an ESE solution there is a range of options.
As FM Sudafix recommends a BS EN IEC 62305 system the following information should not be used to undertake designs and is not provided as advice. ESE device manufacturers cite theories on how lightning forms.When lightning is in the downward leader phase of formation it seeks the path of least resistance. The concept behind ESE devices is that by synthetically providing an upward leader they become a preferable path than those structures around it and those they are installed to protect. ESE product standards have been contested on a number of occasions; they cite a factor defined as ‘advance time’ (t)which is used to determine the area of protection for any given ESE. The following points are based upon the aforementioned product standards and are provided for illustrative purposes only, in no way does the FM Sudafix Group attest to the veracity of these statements.
• The protection radius of an ESE device is elated to its height.
• The ESEmust be installed at least 2mhigher than any other element.
• ESE devices need tomaintain performance in all types of weather.Water ingress could impair ESE performance.
• ESE devices require down conductors.
• Earth termination systems for ESE devices should be designed to successfully disperse current.
•Down conductors should be firmly attached to the external surface at regular intervals using proprietary fixings.
• Flat tape systems aremore effective at dispersing current than round systems on a same quantity basis
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+44 (0)115 975 7600
www.fmsudafix.com
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