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Topic Title: Emergency Escape signage
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Created On: 18 June 2013 11:35 AM
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 18 June 2013 11:35 AM
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ross395

Posts: 2
Joined: 25 July 2008

Greetings All,
Hoping this is an easy question to the experienced lighting designers out there. I'm presently working on a project in a 19th century manor house. For the upgrade of the emergency lighting we have had numerous discussions over the maximum mounting height of the illuminated emergency exit signs.
I am of the opinion that the requirement would be a minimum mounting height of 2m (from BS 5266-1(2011) and should be easily visible from the maximum viewing distance (30m), however I have had fellow engineers arguing contradicting requirements.
The 3 options being discussed are:

1.Minimum mounting height of 2m and should be easily visible from the maximum viewing distance (30m).
2. It is a min of 2m and max of 2.5m.
3. It is a min of 2m but no more than 20 degrees above line of sight from max viewing height.
I would be interested in your opinions of the correct requirement, thanks in advance.
 19 June 2013 02:12 PM
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OMS

Posts: 19900
Joined: 23 March 2004

Suggest you take a look in BS 5499.4:2000 and look at section 4.6

As a quick summary, signs above doors or other openings should be between 2000 and 2500mm AFFL

On walls they should be at 1700 - 2000mm AFFL

You can exceed 2500mm above doors in large areas but the standeard requires the sign to remain conspicuous.

The viewing distance is a seperate issue - all internally illuminated signs should use a factor of 200 x the sign height - giving 35m for a standard BS EN compliant exit sign used on emergency lighting systems.

So none of your suggestions are strictly correct

Regards

OMS

-------------------------
Failure is always an option
 28 June 2013 08:39 AM
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ross395

Posts: 2
Joined: 25 July 2008

Many thanks for the reply OMS, most helpful.

Cheers.
 02 July 2013 08:22 AM
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vakas

Posts: 3
Joined: 23 June 2013

This is why I keep going to this place. I can not believe I missed so many posts since the last time!

Great post. I realy need this info.

Edited: 29 July 2013 at 04:29 PM by IET Moderator
 26 July 2013 01:40 PM
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AaronJolly

Posts: 1
Joined: 26 July 2013

OMS has said very correct things.You must follow that advise. sell house now.

Edited: 30 July 2013 at 10:29 AM by AaronJolly
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