Conduit for shed slab.

[Com_VC]

Getting a slab done at the moment for a 6m x 6m steel shed and thought it would be a good idea to run the conduit in through the slab rather than put it in afterwards.

Just wondering what the best size to run would be. Keep in mind want to run a fair few power points. say 8 double power points, 240volts 10a and some 15a, lighting etc.

Basically just want to make sure the conduit is large enough to accomodate but not too large.

Also what are the regulations regarding depth. By the way the distance isn't that far, there is a shed behind to hook into. about 1.5 metre away

I want to run a new fuse box in the new shed. Generally is there one main feed line that will care of the lights and power points or is there a few?

Any advice would be good.

Thanks

[wozzzzza]

just done similar myself, ive been told by electricial minimum depth 60cm, use 25mm orange conduit.

[nev25]

My advice it to get a sparkie in now.
Pulling cable though conduit thats already in the ground is a Pain in the Ass

[Ivan in Oz]

32mm MINIMUM....that's what I used, so much EASIER

YES!!!!

Pulling can be a Pain.
Get it in before you start,
else get in a draw wire.

When pulling,
Use plenty of Lube, Specially formulated Cable Pulling Commpound,
NOT Detergent or Oil

You can run the Power Point [GPO] cabling within the Framework.

As Nev25 said,

GET A SPARKIE

[Yonnee]

Minimum 600mm below ground.

Minimum 25mm conduit and get the 'large radius' bends, makes it easier to pull the cable through. I pulled a 10mm 2C+E plus a 2.5mm 2C+E and two single cores through a 32mm conduit running 16MTS. Not difficult, just time consuming by yourself.

The thing to be careful of is that if you intend to dig the trench and lay the conduit yourself, don't fill it in till you've spoken to your sparkie, or you know one. Most won't like to sign off on the job if they don't know how deep you've put it. (And they won't take your word for it).

[thatirwinfella]

this was covered barely a fortnight ago, with a member wanting to lay conduit under his driveway. a quick search will find it.

all relevant and legal depths were mentioned, 600mm under concrete is overkill, you can go shallower as is mentioned in the other thread, and as your sparky will tell you.

[Com_VC]

It's not under concrete though. Just dirt. What we have is an existing garage attached with the house (brick) and we are putting a 6x6 colourbond steel shed. They are about 1.5 metres apart from each other.

So I assume 600mm is the go?

I bought some orange conduit from bunning yesterday in 32mm. I didn't get any bends yet as they only had them in white which I would assume wouldn't suit.

Also will it be ok if the conduit sits right at the edge of the slab? Not going to cause the concrete to crack or anything like that?

Just curious, to get around digging 600mm can you place a bit of steel plate over the conduit to protect it or some other suitable material?

Thanks

[Vernonv]

Just curious, to get around digging 600mm can you place a bit of steel plate over the conduit to protect it or some other suitable material?

It can be buried directly under concrete (if I recall correctly), but you'd want to check the specifics with a sparky.

[Ivan in Oz]

I bought some orange conduit from bunning yesterday in 32mm. I didn't get any bends yet as they only had them in white which I would assume wouldn't suit.

Also will it be ok if the conduit sits right at the edge of the slab? Not going to cause the concrete to crack or anything like that?

Just curious, to get around digging 600mm can you place a bit of steel plate over the conduit to protect it or some other suitable material?

Thanks

This is where you Really DO need the Sparkie

Yes, you are Correct
No, but then my Shed used House Type Framing
and
Yes, something better........Completed the Conduit Run

[nev25]

Id like to know where this 600mm comes from
The regs state 500mm if in HD conduit
But most sparkies prefer 600mm just to be sure.

No restriction on size of Conduit

Actually you can used MD conduit if its chased in concrete

There are a few variables depending if its a category A,B or C wiring system.

But a sparkie will be able to tell you.

Yonnee Why did you run so many circuits seems to me to be an expensive way of doing things

[rileyp]

I thought the reg was 300 if in an area that vehicles cant get to.
I haven't done a u/g in 7 years though...
cheers Rileyp

[patty]

Its always been as long as I can remember 600mm and Ive been doin it for a long time now...

Just to follow up on what Nev25 stated about Yonnee

I pulled a 10mm 2C+E plus a 2.5mm 2C+E and two single cores through a 32mm conduit running 16MTS. Not difficult, just time consuming by yourself.

You do understand that installing multiple circuits in one conduit can De-rate the cable/cables obviously pending on the Max demand and if the derating factor was considered in the installation !!

[Spider Webb]

Going by 07 wiring rules what your describing is a Cat A wiring system that needs a minimum 500mm above the top of the conduit with warning marker tape 250mm above that, so depending on the size of conduit you use you go close to 600mm fir the total depth.

300mm if you put min 75mm of concrete above the conduit

Dig the trench for the Electrician and you will save yourself some money.

Stewart

[Com_VC]

another quick question. Can you used the white bends with orange conduit or do they have to be orange?

Thanks

[Vernonv]

The cable must be enclosed in heavy duty conduit. So are the white bends heavy duty? Maybe? Probably?

Personally I would go for orange bends as you can be sure that they are heavy duty.