SWA to my Garage

[ban-all-sheds]

In ducting or just buried 2 core is rated at 37A , 3 core only 30A.

And the reason those two numbers are not the same is..... ?

Use a vacuum cleaner to suck draw strings through the ducts.

Or install with drawstrings in place - some ducts come with it already inside, e.g.:

http://www.drainageonline.co.uk/Ducting/Black-Twinwall-Duct-x-50m-coil.htm

 

[EFLImpudence]

In ducting or just buried 2 core is rated at 37A , 3 core only 30A.

And the reason those two numbers are not the same is..... ?

Do you mean that that (30A) does not apply to multi-core single phase?

If so why does the other column (37A) state 2 core?

 

[seasickstevie]

Maybe the clue's in the numbers - 2 core / 3 phase !

 

[ban-all-sheds]

 

[EFLImpudence]

- 2 core / 3 phase !

Or - single phase / 3 or 4 core

Thanks.

 

[biggerrich]

Use a vacuum cleaner to suck draw strings through the ducts.

Great idea!!

Thanks for all the help but my head is now ringing ha ha!!

I only thought of a 40A as when I googled garage consumer units most had that or a 63A. Because all I need is one light and maybe two double sockets for the chest freezer etc, I knew it would be more likely the 40A one.

As its a pre fab garage I dont have any Extraneous Conductive Parts (although they do sound kind of cool ), the earthing system is the one where the earth is strapped round the incoming 2 core cable and as for the maximum demand, chest freezer 24/7 and sometimes a radio or jigsaw etc.

I may lay the duct in and then get some other advice. Should I pull something more manly through the duct like rope?

 

[EFLImpudence]

I dont have any Extraneous Conductive Parts (although they do sound kind of cool ),

Not that cool - you have to have a large cable clamped to it.

 

[ban-all-sheds]

I only thought of a 40A as when I googled garage consumer units most had that or a 63A. Because all I need is one light and maybe two double sockets for the chest freezer etc, I knew it would be more likely the 40A one.

With the garage CU that's the rating of the RCD in it. As long as it's higher than the load of the circuits either will do - could be an 80 or 100A if you like - makes no difference.

chest freezer

Err...

How cold does it get inside this concrete box in the winter?

You may well find you can't have a freezer out there, or that you need to take particular care when choosing it, as they don't work if it gets too cold.

Should I pull something more manly through the duct like rope?

Yes.

 

[seasickstevie]

... they don't work if it gets too cold.

I've heard the explanation of this a few times. Although it's true, it's one of those oddities of life!

 

[JohnW2]

I've heard the explanation of this a few times. Although it's true, it's one of those oddities of life!

Yes, it's very odd - but I gather that a lot of people experienced it last winter.

Kind Regards, John.

 

[bernardgreen]

Should I pull something more manly through the duct like rope?

Depends on what you are pulling in and the number of curves in the duct route. Stiff SWA can often be pushed into the duct and the draw cord used only to encourage the end to follow the curves in the duct.

For flexible cables a 1/4 in plaited rope will be more than adequate but pull in a new draw cord with the cables. Twisted rope tends to untwist as it pulls the cables in and the cables twist around the new draw cord sometimes making it useless for pulling in cables later. Use a swivel joint between draw cord and cables to prevent the cables twisting.

A good quality clothes line makes a good draw cord.

 

[ban-all-sheds]

I assume you mean the traditional rope clothes line, not the modern plastic covered stuff.