For those who reckon to know the reg's.....

[Engineer54]

To be honest id on this occasion didn't go too deep as this job was designed by others but Clark of Electrical works expressed that only cables relating to the control side are allowed in the lift which generally is lift lighting and possible power points for maintenance as well as control loom to cab, i was informed supplies to lifts are not permitted to be run through the shaft in normal circumstances but due to the build and design of the segregated lift shaft and stairwell it is permitted.
I can only assume in normal circumstances the supply cables could become a fire hazard in themselves that in a shaft linking every floor is a safety concern or the very fact that the supply cables may generally require inspection and been part of the 17th would require a Electrician to gain access to the shaft which of course he is not permitted to do under any circustance without a trained qualified lift engineer.

Its not often im left to speculation but its not an area im often working in and thus means im not going to shell out the large amount of pennies needed to purchase BS EN 81-1 to give definitive answers so would gladly stand corrected if ive misquoted a requirement.

To note the whole extension was built to high fire safety standards even if the whole building attached went up in flames the contruction of the fire escape stairwell and lift shaft should see no propergation of the fire as its all concrete stairs and steel rail structure in a stone self supporting segregated build, only deliberate arson with a dumped fuel source could render the escape void.

I will be looking through our Spec on lift's installations later on today and come back to this thread. I will say now though, is that i have run lift supply cables in the lift shaft, the only stipulations as i can remember off hand, was that they were to be continuous with no joints or connections, and be provided with additional mechanical protected. Every passenger and patient lift on my projects have had redundant power supplies...

 

[Darkwood]

Il be interested exactly what BS EN 81-1 says but it could be the case this was a kirklees regional requirement as the Clark of Electrical Works had input on the design and as i said on related thread regarding MICC it was a one off because the Electrical Company doing the rest of the install couldn't do MICC so i happily obliged.... so as its a one off on my account im a tad vague as to the true requirements and was just relating what Clark of Jerks told me.

 

[Engineer54]

Ok, haven't had that much time to go through everything today, only managed a quick read!! ...First off, redundant supplies must be derived from 2 separate sources, both sourced from the emergency supply arrangements. One such supply being allowed within the lift shaft, the other following an alternative route. No joints or connections of any kind permitted within the lift shaft. Nothing about additional mechanical protection, but where run in conduit/Trunking, internal cable supports required at each floor. I'm assuming here they would be talking about singles in a metal containment system. But it does state insulation to be 105c rated and MICC cable of choice whether installed within or outside of the lift shaft. which figures as all our fire alarm systems are MICC cabled on tray...


Lot more information on lift shaft requirements, but not exactly to do with electrical supplies. Such as, mode of operation in event of a fire alarm, where passenger cars will be over ridden and taken to the ground floor where doors will open and after 60 seconds close and remain closed until re-set by the fire officer. Also seems the patient lift shafts as well as designated evacuation stairwells (which is normal) will be pressurised until such times as smoke/heat detectors have operated, in which case lift will perform similar to the passenger lifts. However, patient lifts can be overridden by trained senior medical staff/fire officers etc, for evacuation purposes... This is just the gist of things so far, i'll be getting more involved closer to the submittal time, which is a some time off for now!!