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Topic Title: External stair case Lightning or Bonding?
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Created On: 19 March 2013 10:18 AM
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 19 March 2013 10:18 AM
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irnbru

Posts: 32
Joined: 23 April 2002

I have a new external steel stair case 5 floors high being erected onto an existing building. The building itself is 6 floors high with very old lightning protection i.e. untested in decades. Do I bond this stair to the MET or consider seperate lightning protection or connect to existing lightning protection and test or ???

Thanks
 19 March 2013 11:22 AM
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OMS

Posts: 19841
Joined: 23 March 2004

Does it introduce a potential into the building - I suspect not - so not required to have main equipotential bonding

Is it more than likley a self protecting structure in terms of lightning protection - I would say yes - it's location may also put it into the protection zone offered by a rolling sphere analysis or angle of protection method calculation which would probably confirm the self protection and that it's not a risk structure given its relative location to the building

It will need bonding to existing LPS to prevent side flashing and may need a connection to an electrode if you cannot determine connectivity to any rebar etc in the foundation pad

Existing LPS should be made compliant - at least in the area of the stairway

There should be a single point of common bonding from the Building MET to the LPS system

How far your design needs to go with all that is probably a matter of your appointment document but the technical content is generally as above.

Regards

OMS

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Failure is always an option
 19 March 2013 11:24 AM
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GB

Posts: 364
Joined: 04 September 2002

If memory serves then if your existing lightning protection is up to standard it will generally (30 deg coverage from roof edge) cover the external staircase, I would get in a lightning protection specialist to advise on existing system and whether a link to the staircase is required.
 21 March 2013 06:07 PM
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Legh

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Joined: 17 December 2004

Will the external stairs have any lights on them ?

Legh

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http://www.leghrichardson.co.uk

"Science has overcome time and space. Well, Harvey has overcome not only time and space - but any objections."
 16 May 2013 06:07 PM
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irnbru

Posts: 32
Joined: 23 April 2002

Just an update really. The stairs had no electriclal equipment installed on it. The LPS guys just connect it to existing LPS.
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