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Topic Title: Cable selection
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Created On: 26 November 2012 10:35 PM
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 26 November 2012 10:35 PM
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Westonelectrical

Posts: 85
Joined: 26 November 2012

Hi newbie here... Just a quick one, have a 600mm void above a suspended celing, with 13 hf lights (600x1200) cable selection either lsf? Or hr?
 27 November 2012 10:33 PM
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DOUGIE1000

Posts: 4174
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why what temperature do you expect ceiling void to get to?

Im trying to think of all the office ceiling tiles i lifted over the yearsand not seen much lsf wiring.

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Dougie
Power Plus Electrical.co.uk

My mission is to live as long as possible......so far so good!
 27 November 2012 10:36 PM
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daveparry1

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What's wrong with t/e then?
 27 November 2012 10:37 PM
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AJJewsbury

Posts: 11679
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What's the situation? I'd only think about LSF if there would be a particular problem with smoke if there was a fire - e.g. escape route in a public building or somewhere like a data centre or museum where the cost of cleaning up smoke damage would be excessive.

- Andy.
 28 November 2012 07:51 AM
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dickllewellyn

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Ideally a nice neat instalation with plug in roses or banks, flexes to final light fittings. Realistically, lift tile, stick head through, coil of t+e, best boomerang throw! New fangled cable rods probably have a place these days, but a well aimed boomerang throw is satisfying, if rough as a badgers behind!

If you can get in before the ceiling grid you have a chance at a neat instalation.

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Richard (Dick)

"Insert words of wisdom and/or witty pun here"
 28 November 2012 04:18 PM
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Westonelectrical

Posts: 85
Joined: 26 November 2012

Council have demeaned fire alarm system and in there words some sort of heat resistance cable, flats above the shop, it's a full re-wire.. The condition at the miniute is terrible
 28 November 2012 04:21 PM
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Westonelectrical

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Full access above celing to :-)
 28 November 2012 04:30 PM
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OMS

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Joined: 23 March 2004

What is the intermediate floor construction ?

Regards

OMS

-------------------------
Failure is always an option
 28 November 2012 05:36 PM
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Westonelectrical

Posts: 85
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It's concrete, also there is only one fire escape
 28 November 2012 06:31 PM
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OMS

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Sounds like council don't have a clue (wouldn't be the first time).

Given the relative fire loads presented by the electrical installation and everything else in a building, then providing a fire resistant cable is pretty pointless. HR cable would be even more pointless.

I'd go back and challenge them as to what they want in reality now they've had a bit of time to think about it. Whilst your at it ask them what the cause and effect and category of fire alarm system they require - if you are designing it, you may be in a world of s!!t if you get it wrong

Regards

OMS

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Failure is always an option
 28 November 2012 08:00 PM
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Westonelectrical

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They have been quite precise on the category of system they want.. Luckily.
 28 November 2012 08:26 PM
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OMS

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OK - that's a start - get the fire resistance of the general cabling clarified - it could save you (and/or the client) a few bob

Regards

OMS

-------------------------
Failure is always an option
 28 November 2012 09:30 PM
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Westonelectrical

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I'm gunna get on it tomorrow, thanks oms
 28 November 2012 09:44 PM
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OMS

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Sounds like a candidate for a nice little 3" x 3" trunking run and some plastic conduit and klix roses to me

Failing that - a few ugly strap loops and rough it in with T&E

OMS

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Failure is always an option
 29 November 2012 12:45 PM
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Westonelectrical

Posts: 85
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Gt my klix.. Just spoke to customer they want lsf, but moaned when the price changed :-/.. Was considering some sort of tray but I've price for band now..
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