Pulling conduit

[highspark]

How do you guys pull your cables through conduit. What have you found the best method.

 

[malcolmsanford]

im really old school,i use my eyes..tho has anyone noticed even when you use a laser or a level it still looks pisd compared to anything else thats been previously installed,thats when i use the good old fashioned eye to make good.:stuart:

That's called "Nigh enough for the pit" where I came from mate

 

[Jamesy]

i am replacing a 6mm cable for a 10mm cable this week through an old system of conduit which im assuming is a 25mm diameter but in case it is full up would it be easier to run single core's in instead i'm wondering. which if ive aready bought the twin and earth i can splice the doubled insulation off remove it and use the 3 single insulated if it is already mechanically protected surely?

 

[Andy78]

i am replacing a 6mm cable for a 10mm cable this week through an old system of conduit which im assuming is a 25mm diameter but in case it is full up would it be easier to run single core's in instead i'm wondering. which if ive aready bought the twin and earth i can splice the doubled insulation off remove it and use the 3 single insulated if it is already mechanically protected surely?

The way that is written it sounds like you are expecting your T+E CPC to be insulated under the sheathing.

 

[Jamesy]

Ok that will be the only bare conductor i will need. and i will need to take that into account when i puchase one single core 10mm cpc. but then i might just get to keep the bare copper for scrap ££ lol.

It is better to decide how i am going to do it first you're right!.

double or single insulated.? - hopefully the former is the one!

 

[Andy78]

Best to suss the job first. If you are forking out for 10mm of any kind, it's gonna be pricy if you drop a ------- on either the type of cable or the length.

 

[Jamesy]

so yeah i agree totally. just that i am doing the job on a sunday aswell which is never the best time to be searching for the wholesalers that are open.

 

[Engineer54]

You only need single insulation cable in conduit!! Tails are not actually classed as double insulated, they are sheathed and insulated cables...

Where they leave the conduit into free air, such as at the meter etc, they can have a heat shrink cover to protect the insulation. Depending on the conduit size, route and amount of 90deg bends, you may or may not have trouble pulling in the 3 x 10mm cable...

 

[Jamesy]

what I mean is it is a 10mm2 twin and earth flat cable. which is a bit of a lumpy cable as you know.

The existing cable that i am replacing is a 6mm twin and earth flat cable. would this be a struggle to feed through. any tips would be appreciated!

 

[dellboy78]

I would imagine pulling a 10mm t&e through conduit would not be much fun especially if there are other cables already in the tube and/or if there are a lot of bends to pull round. Even with inspection boxes you will struggle with t&e in my opinion. Unless it is a straight run I would definitely use singles. Cant you take the t&e back?

 

[UNG]

Just a variation on the water level thing a mate of a mate was a beer dispense installer and had an install to do on a ferry used a spirit level and mounted some kit on the wall went to the van for more kit and came back to the "cellar" to find the kit he had mounted wasn't level so took it off the wall and fitted it again having struck more levels turns out he did this a few times before the penny dropped that the trim of the boat was constantly changing due to stores being loaded

 

[Jamesy]

I would imagine pulling a 10mm t&e through conduit would not be much fun especially if there are other cables already in the tube and/or if there are a lot of bends to pull round. Even with inspection boxes you will struggle with t&e in my opinion. Unless it is a straight run I would definitely use singles. Cant you take the t&e back?

Cheers Andy your a mind reader I was thinking this today. I am going to buy the singles and a length of single 2.5mm2 cpc. I havent bought the T&E yet luckily! Although i supposed it wouldnt do no harm stripping the outer sheath of to use the singles inside if i had of bought it.

 

[malcolmsanford]

Cheers Andy your a mind reader I was thinking this today. I am going to buy the singles and a length of single 2.5mm2 cpc. I havent bought the T&E yet luckily! Although i supposed it wouldnt do no harm stripping the outer sheath of to use the singles inside if i had of bought it.

That CPC is a bit near the bone, have you checked if it will be man enough

 

[Jamesy]

That CPC is a bit near the bone, have you checked if it will be man enough

No I havent to be honest with you. well what someone has told me is that will be fine. its for a 10.5kw load 50a mcb and 10mm2 conductors.

 

[dellboy78]

I would do your sums to be sure! Don't take someone elses word for it!

 

[Jamesy]

It's a 3 metres run only on a 50 amp mcb that's got to be alright. I need a bigger one what would u suggest ?

 

[johnboy6083]

Try the adiabatic.

 

[Jamesy]

Well whatever it is that doesn't sound like it would make a part of a good earth loop path lol

 

[dellboy78]

As above. Use the adiabatic equation. Or at least use a 4mm earth.

 

[Jamesy]

I'm going for it tomorrow. As i am nearly through my level 3 2330 this is my first install I have taken on I just needed to get the important variables right but the rest I suppose is trial and error. 4mm is ok then thanks Delboy! (I'm almost tempted to do it in trunking) but this is the right way!

 

[Engineer54]

What is the cost difference on using 4mm over a 2.5mm CPC for 3 or 4 metres?? Peanuts i would think, so forget about adiabatic equations and use a 4mm CPC for those 10mm cables and be able to walk away in confidence at the end of the day!!! lol!!!