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Topic Title: Slotting ceiling
Topic Summary: joists
Created On: 18 June 2013 09:22 PM
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 18 June 2013 09:22 PM
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Ampman

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Evening ,

I quoted a job to relocate some light fittings in a house centre them to the rooms , from near the windows ,

Builder told me floors upstairs would be accessable because he was ripping up laminate floors ,

He rang me yesterday to tell me to come & do the job . i asked weather he ripped floors up yet . to be told floors now being kept .

but lights still want relocating .

now i still want to gain access underfloors but builder has asked me to slot the plasterboard either side of a joist & clip cable in the slot ?

Im not keen .

circuit is rcd protected.
 18 June 2013 09:26 PM
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Ampman

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Ps I told him i can drill a 6 inch hole then drill joist from below , he not keen ?
 18 June 2013 09:26 PM
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Grumpy

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I'm not keen either!
You're an electrician, he's a builder, spell it out.
 18 June 2013 09:30 PM
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Grumpy

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PS I wasn't keen on your original post but am liking your PS! There are only two options, from above or from below let your builder choose!
 19 June 2013 09:34 AM
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AJJewsbury

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slot the plasterboard either side of a joist & clip cable in the slot ?

I guess that's allowable if you use BS 8436 cable or better....

- Andy.
 19 June 2013 09:45 AM
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tattyinengland

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You could drill/cut giant holes in the ceiling to allow access to drill the joist......... Then it is the builders problem to fill/repair/paint.
 19 June 2013 10:39 AM
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daveparry1

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Yes Andy, we were talking about the BS8436 cable the other day weren't we, it does seem like it could be useful for some of these types of jobs, I must get some. Don't really feel like buying 100m of it though which I think is all that SF sell it in, maybe there are other suppliers that might do it in smaller reels,

Dave.
 19 June 2013 12:28 PM
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dickllewellyn

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I think I'd rather get a 100mm hole cutter, some batten, and some filler and drill a hole through the joist than £200 worth of cable to move a light personally!

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Richard (Dick)

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 19 June 2013 12:46 PM
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Cremeegg

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OK - lets show my ignorance - why use BS8436 cable when the circuit is RCD protected and as far as I'm aware the 50mm depth requirements only applies to walls not ceilings.

In similar situations I've used at least a 100mm hole cutter to create enough access holes to pull cables, drill joists etc and then left the off cut ready for the builder to put back, fill and skim over. They prefer that than lifting and relaying laminate floors.
 19 June 2013 12:56 PM
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AJJewsbury

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OK - lets show my ignorance - why use BS8436 cable when the circuit is RCD protected and as far as I'm aware the 50mm depth requirements only applies to walls not ceilings.

There's a similar 50mm for ceilings too - see reg 522.6.100, but as there're no 'safe zones' the safe zone + RCD option we have for walls isn't available. Strictly speaking the detail applies to a cable passing through a joist, rather than under it, but the general nature of the first sentence of 522.6.100 I think means we need to take some precautions (and the ones listed as allowable for through a joist seem sensible).

- Andy.
 19 June 2013 01:20 PM
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AJJewsbury

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than £200 worth of cable to move a light

Slight exaggeration - Screwfix is £99.52 + VAT for 1.5mm2.

Besides, it's cheaper than using 1mm2 red & black it seems - http://www.ebay.co.uk/itm/Old-...ble-100M-/320549834682

- Andy.
 19 June 2013 01:27 PM
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redtoblackblewtopieces

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Electricfix sells 1.5 2core at £89.56 + vat (every saving helps)
Kevin

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 19 June 2013 04:22 PM
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dickllewellyn

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Originally posted by: AJJewsbury

than £200 worth of cable to move a light


Slight exaggeration - Screwfix is £99.52 + VAT for 1.5mm2.



Besides, it's cheaper than using 1mm2 red & black it seems - http://www.ebay.co.uk/itm/Old-...ble-100M-/320549834682



- Andy.


Cheaper than I thought then! I wonder what it was I looked at the other day. Maybe it was 2.5 3core or something I looked at. I take it all back. I will use said cable and notch beneath joists with gay abandon....

Second thoughts, I think I'll stick to cutting a hole and drilling through. Worth bearing that cable in mind for future jobs though, particularly if it is kept in stock.

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Richard (Dick)

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 19 June 2013 05:01 PM
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Cremeegg

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Andy - big green book re-read - had totally missed 522.6.100 and just concentrated on 522.6.101 - many thanks for putting me right.
 19 June 2013 11:49 PM
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Martynduerden

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Three little words.... Don't do it

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Martyn.

Only a mediocre person is always at their best
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