Armoured Cable

Rockingit

keystone wrote: »

Lol you two know full well it was TC&E or even flex inappropriately installed and not compliant with regs by any stretch of the imagination. An object lesson if ever there was one.

Cheers

Probably more likely tufflex or H07, but same net problem!!

keystone

Rockingit wrote: »

Probably more likely tufflex or H07,

Optimist!

but same net problem!!

True

Cheers

ihatebananas

Hi,

Perhaps I am looking at it too simply!!!

I was just going to dig a trench to 700mm as advised lay the specified cable putting some sand/gravel round it then the soil back on top, roll the end up and cover with heavy plastic until the electrician comes and does the hard bit.

Rockingit, in answer to your questions

1) no
2) a strip light and a double socket
3) and 4) I was going to let the electrician decide

zaax

Put ducting in rather than cable, then in future any cable can be removed or more cable added etc. Just use something like this

http://www.ebay.co.uk/bhp/cable-ducting

Rockingit

ihatebananas wrote: »

Hi,

Perhaps I am looking at it too simply!!!

I was just going to dig a trench to 700mm as advised lay the specified cable putting some sand/gravel round it then the soil back on top, roll the end up and cover with heavy plastic until the electrician comes and does the hard bit.

Rockingit, in answer to your questions

1) no
2) a strip light and a double socket
3) and 4) I was going to let the electrician decide

I can give you a calculation to work from, but I advise you double check it with your own electrician first before parting with money on a confirmed order. See below.

no1catman

Myser wrote: »

Hope it's suitably IP rated and you have sealed it properly to prevent water ingress?

I agree with 'vaio' though, how did you snip! through an armoured cable :huh:.

Blagdon product - used one before where the cable for the filter wasn't long enough, hence armoured cable from wall mounted (Blagdon) Powersafe to link together. It has survived six years - in the rain, ice and snow.

A pair of secateurs - I had to use a small saw to expose the leads, Stanley knife no use!

Rockingit

Load = 16A total after diversity
Length = 30m.
Maximum voltage drop allowed for lighting = 3% (6.9V from 230V)

BS7671 Tabulated values for voltage drop:
2.5mm = 18mV/A/m Max current buried direct in ground or conduit = 29A
4mm = 11mV/A/m " " " " 37A

Therefore:
18 x 16A x 30m = 8640 / 1000 = 8.64V = volt drop does not comply
11 x 16A x 30m = 5280 / 1000 = 5.28V = acceptable.

Therefore, 4mm line conductor is required.

Next: 4mm PVC SWA has a conductor equivalent of 8.86mm in the armour so will be adequate for exporting PME / TN-C-S earthing (your 'most demanding' earthing system for the sake of simple explanation).

Therefore, 2 x 4mm conductor with the armour used as earth is your best MSE option! Your sparky will be able to deal with this (assuming they are competent).

https://www.electric-cable.com/swa-electric-cable.php part no. 100003

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HOWEVER...... if you can reduce your distance, or are prepared to accept a lower available maximum loading (16A = 4KW [a standard kettle is 3KW to give you some idea]) then the maths all changes - you can hopefully use the sums above yourself and modify to suit - and you might be able to get away with a 2.5mm cable which would be slightly cheaper, however if it was me personally I'd stick with 4mm as that gives some small scope for the future.

cootuk

Wouldn't the electrician also want to see the cable before you backfill, so they know it's installed at the right depth with no joints etc etc

Rockingit

cootuk wrote: »

Wouldn't the electrician also want to see the cable before you backfill, so they know it's installed at the right depth with no joints etc etc

If it was me, then yes.

ihatebananas

Many, many thanks for replies.

It is beginning to become more complex than I thought!!!

Rockingit what do you think to the ducting Zaax suggests??

I can put that in then the electrician can sort out the armoured cable himself and thread it through.

I just really need to put my seed down as my garden is the local litter tray for every feline in the country!!


Thx