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Discuss cable run perpendicular to loft joists. in the Electrical Forum area at ElectriciansForums.net

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ianphilip007

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hi just been to look at a job, have to get a cable accross 4 joists ( perpendicular) now i know drilling loft joists is a no no, the cable run will be in an area of the loft not used for storage and the customer has no intention to board out the loft is there anything wrong with laying the cables accross the joists, neatly and secured under the existing insulation? ( 1.5mm 6amp lighting)
 
Aico 3000
i=p/u

i=p/u

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Arms
see it all the time, and you can drill the joists???????????/
 
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ianphilip007

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  • Thread Starter Thread Starter
  • #3
can you ?? always wondered why people say you cant as they support my weight when im waliking arround lofts.
 
i=p/u

i=p/u

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Arms
0.4 times the span = dont drill loads of holes beside eachother and leave spaces of hole diameter.... its in a boook somewhere
 
O

Octopus

How is a single 10mm hole going to weaken a joist?

That said some of the new builds around here have joists I wouldn't burn!
 
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ianphilip007

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  • Thread Starter Thread Starter
  • #7
yes i know its in the book is that for floor and loft joists ?? im not totally sure it is. i guess it depends on the size of the joist in the loft space.

i cant really see any problem with laying over the joist as in a non traffic area and customer is not boarding the loft
 
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ianphilip007

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  • Thread Starter Thread Starter
  • #8
i agree murdoch as i said if the joist can take my weight i cant see how a 10mm holw is going to make the roof come crashing down.
 
i=p/u

i=p/u

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Arms
ive seen it loads of times, but you should clip to the joists slightly below the top surface, just so no1 does kick them stand on them
 
O

Octopus

I'd venture to suggest that going through the odd joist is better, especially if some muppet comes along with boards later and traps the cable between the joist and the board!
 
i=p/u

i=p/u

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Arms
yh put them in joists if only four joists and one cable = 10mm hole be fine
 
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ianphilip007

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  • Thread Starter Thread Starter
  • #12
thats my preferred option to be honhest just wasnt sure just looked in the building regs for electricians and it states the hole/span sizes are for both roof and floor joist i guess its wheather a roof joist = loft joist. confusing
 

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