Galvanised Conduit in house conduit factors

[Chrishands]

Hello.

i've got a brick wall in my conservatory and ive painted it a color but left the bricks on show, currently the electrics for s/o and lighting are in shoddy plastic off cuts of mini trunking and exposed bits of old twin and earth.


I was thinking of using Galvanised conduit and put it on show and make a feature of it, it should look nice because of the brick wall (i hope, maybe i'm mad)

I am trying to do my conduit factors, but cant find any factors for multicore cables, the one length of conduit will haver 9 singles and 1x twin and earth, i need to know factors so that i can appropriately select my conduit sizes.

can anyone direct me to the place i can find factors for both singles and multicore / flat cables.

Thanks,
Chris

 

[frontier219]

Hello.

i've got a brick wall in my conservatory and ive painted it a color but left the bricks on show, currently the electrics for s/o and lighting are in shoddy plastic off cuts of mini trunking and exposed bits of old twin and earth.


I was thinking of using Galvanised conduit and put it on show and make a feature of it, it should look nice because of the brick wall (i hope, maybe i'm mad)

I am trying to do my conduit factors, but cant find any factors for multicore cables, the one length of conduit will haver 9 singles and 1x twin and earth, i need to know factors so that i can appropriately select my conduit sizes.

can anyone direct me to the place i can find factors for both singles and multicore / flat cables.

Thanks,
Chris

Don't know the answer to your question, but I would suggest black enamel would make a nicer feature than galv!

 

[davesparks]

There are no conduit factors for insulated and sheathed cables as it is not a standard installation method. You will have to work it out for yourself i'm afraid.

 

[ipf]

Get 3 or 4 bare pyros thrown in. Give over messing ...... and start dressing.

 

[Pete999]

Hello.

i've got a brick wall in my conservatory and ive painted it a color but left the bricks on show, currently the electrics for s/o and lighting are in shoddy plastic off cuts of mini trunking and exposed bits of old twin and earth.


I was thinking of using Galvanised conduit and put it on show and make a feature of it, it should look nice because of the brick wall (i hope, maybe i'm mad)

I am trying to do my conduit factors, but cant find any factors for multicore cables, the one length of conduit will haver 9 singles and 1x twin and earth, i need to know factors so that i can appropriately select my conduit sizes.

can anyone direct me to the place i can find factors for both singles and multicore / flat cables.

Thanks,
Chris

what size singles? what size T and E?

 

[Andy78]

The flat twin cable should be treated as a circular cable that is the same diameter as the widest measurement of the flat cable. So for 2.5mm twin in 20mm conduit the max is one cable according to conduit factors. If you are asking how many 2.5mm twin you can actually fit in a 20mm conduit, the answer is two depending on length of run and bends.

 

[Chrishands]

The flat twin cable should be treated as a circular cable that is the same diameter as the widest measurement of the flat cable. So for 2.5mm twin in 20mm conduit the max is one cable according to conduit factors. If you are asking how many 2.5mm twin you can actually fit in a 20mm conduit, the answer is two depending on length of run and bends.

Hi thanks for reply, i Actually wanted to put 6 singles to switch witb 1x 1.5mmmsq in the same conduit. The 1.5 is power supply

 

[Andy78]

Appx E in the OSG then for your conduit stuffing sums.

 

[7029 dave]

Why t&e in conduit.?

 

[davesparks]

Why t&e in conduit.?

Because it looks ugly in the existing mini trunking so he's tidying it up by putting it in steel conduit

 

[7029 dave]

Because it looks ugly in the existing mini trunking so he's tidying it up by putting it in steel conduit

Plus 9 singles, he never stated the size, but hay hoe.

 

[Chrishands]

Plus 9 singles, he never stated the size, but hay hoe.

6x 1.5mmsq singles ( 3x switch feed and return)
1x 1.5mmsq t+e existing supply to room for lighting circuit

 

[Andy78]

6x 1.5mmsq singles ( 3x switch feed and return)
1x 1.5mmsq t+e existing supply to room for lighting circuit

T&E treated as I said in post#6, singles treated as per appx E from the OSG. Add together for final figure and reference against the appropriate conduit factor.

Or joint out the 1.5mm to singles before it enters the conduit and use appx E for singles only.

Or just stuff em all in.

 

[telectrix]

or use some nice shiny galv. trunking. loads of room in 2 x 2 , and no sweating with pull through or bender.

 

[Chrishands]

T&E treated as I said in post#6, singles treated as per appx E from the OSG. Add together for final figure and reference against the appropriate conduit factor.

Or joint out the 1.5mm to singles before it enters the conduit and use appx E for singles only.

what do the regs say about mech protection? All cables in house run along tge top of tge wall set back into the brickwork witb a wooden cover due to concrete ceelings, I could joint there, but I hate joints where avoidable seems like bad practice

 

[7029 dave]

Your capacity factor is 460 20mm conduit, so work out your cable sizes solid/ stranded.How many bends etc.

 

[Andy78]

what do the regs say about mech protection? All cables in house run along tge top of tge wall set back into the brickwork witb a wooden cover due to concrete ceelings, I could joint there, but I hate joints where avoidable seems like bad practice

Well any joints would clearly need to be in an enclosure. If you were jointing at the start of a conduit run then a good idea for an enclosure would be a conduit box.
Not trying to be obvious, just not sure what you are asking.

 

[Engineer54]

Conduit runs with 2 or more 90 degree bends, should have a space factor not exceeding 40%!!