Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

--
Chris Green
·

Chris Green wrote:

Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists?

What of the new 18th Ed requirements to fix cables such that they don't
droop down in the event of a fire?

https://www.shop.niceic.com/18edition-news/18th-edition-cable-fixings

On 26/01/2019 09:22, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).


Trunking not conduit if it has a clip on cover?

Either is fine but you should put some metal clips/p clips or all round
band inside the trunking to secure the cable in the event of a fire.



--
Adam

On 26/01/2019 09:22, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

You could just clip the cable straight across the underside, and then
use the metal normally used to protect cables under plaster in protected
zones "over" (or rather under?) it, if you see what I mean?. Also a
little bit mechanically stronger in the event of accidentally swinging a
tool between the joists.

ARW wrote:
On 26/01/2019 09:22, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).


Trunking not conduit if it has a clip on cover?

Either is fine but you should put some metal clips/p clips or all round
band inside the trunking to secure the cable in the event of a fire.

Trunking, yes. Conduit you have to poke it through don't you.

.... and yes, thanks for the new 18th edition requirement which means
I'll need to put metal clips of some sort round the trunking. Are
clips like this now available or will I have to improvise something?

--
Chris Green
·

On 26/01/2019 12:55, Chris Green wrote:
ARW wrote:
On 26/01/2019 09:22, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).


Trunking not conduit if it has a clip on cover?

Either is fine but you should put some metal clips/p clips or all round
band inside the trunking to secure the cable in the event of a fire.

Trunking, yes. Conduit you have to poke it through don't you.

... and yes, thanks for the new 18th edition requirement which means
I'll need to put metal clips of some sort round the trunking. Are
clips like this now available or will I have to improvise something?


Anything metal will do [1] so use all round band, P clips or google for
"clips for trunking" that will bring up some metal U shaped clips
designed for trunking.

[1] It probably has to be steel. Sodium and mercury etc just do not cut
the mustard:-)
--
Adam

On 26/01/2019 12:55, Chris Green wrote:
ARW wrote:
On 26/01/2019 09:22, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).


Trunking not conduit if it has a clip on cover?

Either is fine but you should put some metal clips/p clips or all round
band inside the trunking to secure the cable in the event of a fire.

Trunking, yes. Conduit you have to poke it through don't you.

... and yes, thanks for the new 18th edition requirement which means
I'll need to put metal clips of some sort round the trunking. Are
clips like this now available or will I have to improvise something?


Inside the trunking!

--
Adam

Is there a car in said garage, and what height is it?
Brian

--
----- --
This newsgroup posting comes to you directly from...
The Sofa of Brian Gaff...

Blind user, so no pictures please
Note this Signature is meaningless.!
"Chris Green" wrote in message
...
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

--
Chris Green
·

On Saturday, 26 January 2019 09:33:05 UTC, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists?
It's to run a couple of 2.5sq mm feeds across the ceiling of a garage

If you use 20mm plastic conduit it will take 2 x 2.5 mm T&E, and you can use metal conduit saddles to satisfy the fire support requirements.

Drawback with conduit is that you have to thread the cables through rather than laying the trunking over them.

Owain

On 26/01/2019 10:10, ARW wrote:
On 26/01/2019 09:22, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists?Â* I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed.Â* Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).


Trunking not conduit if it has a clip on cover?

Either is fine but you should put some metal clips/p clips or all round
band inside the trunking to secure the cable in the event of a fire.




Last time I looked, there didn't seem to be any aimed specifically at
plastic conduit - I assume one just buys metal conduit clips that's sold
for metal conduit...

--
Email does not work

On 26/01/2019 14:59, Tim Watts wrote:
On 26/01/2019 10:10, ARW wrote:
On 26/01/2019 09:22, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists?Â* I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed.Â* Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).


Trunking not conduit if it has a clip on cover?

Either is fine but you should put some metal clips/p clips or all
round band inside the trunking to secure the cable in the event of a
fire.




Â*Last time I looked, there didn't seem to be any aimed specifically at
plastic conduit - I assume one just buys metal conduit clips that's sold
for metal conduit...


Yep.

--
Adam

Brian Gaff wrote:
Is there a car in said garage, and what height is it?
Brian

It's a 3 car (wide) garage, there's a motorbike in slot 1, a car in
slot 2 and a mower in slot 3. The roof joists are quite high, 2.5
metres or so I would guess.

--
Chris Green
·

wrote:
On Saturday, 26 January 2019 09:33:05 UTC, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists?
It's to run a couple of 2.5sq mm feeds across the ceiling of a garage

If you use 20mm plastic conduit it will take 2 x 2.5 mm T&E, and you can
use metal conduit saddles to satisfy the fire support requirements.

Drawback with conduit is that you have to thread the cables through rather
than laying the trunking over them.

Doing the voltage drop sums I think I'll probably need 4sqmm, but if I
do that I'll only need one (see new thread) cable so it would fit
easily in a 20mm conduit or an oval 25mm.

I'm now trying to decide whether to use a single length of PVC T&E
with conduit and catenary for the overhead bit or whether to use T&E
for the indoor bit and SWA for the outdoor bit. It probably doesn't
matter all that much.

--
Chris Green
·

On Saturday, 26 January 2019 09:33:05 UTC, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

You could, but it makes more sense to clip the cable to the sides of the joists without trunking.


NT

wrote:
On Saturday, 26 January 2019 09:33:05 UTC, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

You could, but it makes more sense to clip the cable to the sides of the joists without trunking.

The run is *across* the joists, not in the same direction as the
joists run.

--
Chris Green
·

On 27/01/2019 11:16, Chris Green wrote:
wrote:
On Saturday, 26 January 2019 09:33:05 UTC, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

You could, but it makes more sense to clip the cable to the sides of the joists without trunking.

The run is *across* the joists, not in the same direction as the
joists run.

Any particular reason not to run it naked through 12 mm holes?

On 28/01/2019 16:03, newshound wrote:
On 27/01/2019 11:16, Chris Green wrote:
wrote:
On Saturday, 26 January 2019 09:33:05 UTC, Chris GreenÂ* wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists?Â* I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed.Â* Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

You could, but it makes more sense to clip the cable to the sides of
the joists without trunking.

The run is *across* the joists, not in the same direction as the
joists run.

Any particular reason not to run it naked through 12 mm holes?

300mm max cable support spacing[1]? I wouldn't claim to comply always
and everywhere but it'd be a bit obvious in a garage roof.

[1] for 10 to 15mm diameter

--
Robin
reply-to address is (intended to be) valid

On 28/01/2019 16:34, Robin wrote:
On 28/01/2019 16:03, newshound wrote:
On 27/01/2019 11:16, Chris Green wrote:
wrote:
On Saturday, 26 January 2019 09:33:05 UTC, Chris GreenÂ* wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists?Â* I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed.Â* Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

You could, but it makes more sense to clip the cable to the sides of
the joists without trunking.

The run is *across* the joists, not in the same direction as the
joists run.

Any particular reason not to run it naked through 12 mm holes?

300mm max cable support spacing[1]?Â* I wouldn't claim to comply always
and everywhere but it'd be a bit obvious in a garage roof.

[1] for 10 to 15mm diameter

Fair point, although I don't see much "electrical" risk. I still thing
the quickest and easiest way might be to use metal capping as a sort of
mini "cable tray".

newshound wrote:
On 28/01/2019 16:34, Robin wrote:
On 28/01/2019 16:03, newshound wrote:
On 27/01/2019 11:16, Chris Green wrote:
wrote:
On Saturday, 26 January 2019 09:33:05 UTC, Chris GreenÂ* wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists?Â* I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed.Â* Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

You could, but it makes more sense to clip the cable to the sides of
the joists without trunking.

The run is *across* the joists, not in the same direction as the
joists run.

Any particular reason not to run it naked through 12 mm holes?

300mm max cable support spacing[1]?Â* I wouldn't claim to comply always
and everywhere but it'd be a bit obvious in a garage roof.

[1] for 10 to 15mm diameter

Fair point, although I don't see much "electrical" risk. I still thing
the quickest and easiest way might be to use metal capping as a sort of
mini "cable tray".

I'm probably going to take it outside but, if not, I think cable trays
will be the way to go, much less hassle than clipping or trunking I
think - and looks don't matter in the garage.

--
Chris Green
·

In article ,
newshound wrote:
On 28/01/2019 16:34, Robin wrote:
On 28/01/2019 16:03, newshound wrote:
On 27/01/2019 11:16, Chris Green wrote:
wrote:
On Saturday, 26 January 2019 09:33:05 UTC, Chris Green wrote:
Is it acceptaple to run cables in (probably standard plastic clip on
cover) conduit fixed to the underside of exposed joists? I can't see
any reason why it shouldn't be OK but want to check.

It's to run a couple of 2.5sq mm feeds across the ceiling of a garage
which has a room above it but where the joists are exposed. Going
round the edge at the top of the walls is possible but rather messier
with obstructions and such (and would also use more cable).

You could, but it makes more sense to clip the cable to the sides of
the joists without trunking.

The run is *across* the joists, not in the same direction as the
joists run.

Any particular reason not to run it naked through 12 mm holes?

300mm max cable support spacing[1]? I wouldn't claim to comply always
and everywhere but it'd be a bit obvious in a garage roof.

[1] for 10 to 15mm diameter

Fair point, although I don't see much "electrical" risk. I still thing
the quickest and easiest way might be to use metal capping as a sort of
mini "cable tray".

cable support is not to deal electrical problems but with the blocking of
an escape route by drooping, burning cables. I understood, from a
presentation on the new REgs, that a firefighter lost his life having been
trapped.

--
from KT24 in Surrey, England
"I'd rather die of exhaustion than die of boredom" Thomas Carlyle