Armoured cable connections

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justins

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Here's my setup:

New external meter cabinet with Meter and DNO isolator / fuse.

Here's what I want to do:

Take power from this cabinet (using UG SWA cable) to:

  1. Main house consumer unit
  2. Shed / garage consumer unit
  3. Borehole water pump shed consumer unit.



1, 2 and 3 are all about 30m from the cabinet, in different directions, but not completely different directions (ie taking junctions off a single cable would save a lot of cabling.

Would appreciate some advice on the best way to to this please - size of cable, numbers of cables, fuses, equipment in meter cabinet.

Thanks.

 
Welcome to the forum.

Depending on where you live. This work will be notifiable.

Shouldn't the electrician who is designing, installing, testing and putting their name on the certs be designing this for you?

I'm not giving out cable sizes, this is down to the electrician, but wouldn't the best option be:

Go from meter to house CU.

Wire shed & borehole CU's to house CU.  (This all depends on whats going in the shed)

 
Spoon said:
elcome to the forum.

Depending on where you live. This work will be notifiable.

Shouldn't the electrician who is designing, installing, testing and putting their name on the certs be designing this for you?

I'm not giving out cable sizes, this is down to the electrician, but wouldn't the best option be:

Go from meter to house CU.

Wire shed & borehole CU's to house CU.  (This all depends on whats going in the shed)

Agree with Spoon, anyway you haven't mentioned any loading details, installation methods etc as Spoon said all down to the Electrician doing the work
Click to expand...

 
Last edited by a moderator:
Are you the installing electrician? 

Are you the property owner? 

Are you the tenant? 

What at are you hoping of having in the shed/garage? 

What are the ratings of the bore pump? 

What type of supply have the DNO given you? 

 
Sharpend said:
Are you the installing electrician? 

Are you the property owner? 

Are you the tenant? 

What at are you hoping of having in the shed/garage? 

What are the ratings of the bore pump? 

What type of supply have the DNO given you? 
Click to expand...
Please don't read me the rule book guys. Just some friendly advice? I wouldn't dream of doing anything that I wasn't qualified to do, even after having asked advice from those who are to ensure that everything was safe.... I'm clearly not the installing electrician or I wouldn't be asking. Tenant is unlikely to be installing a bore pump. I'm the property owner.

Knowing what is involved and the best way to do this will help me to cost parts for the job and to plan my trenching. Also give me some know how when discussing options with my electrician (I haven't employed one yet)

Shed: 1 lighting circuit for 3 or 4 lights, one 13A ring main (maybe a dozen sockets) to run power tools etc

Bore pump: 2kw

 
justins said:
Knowing what is involved and the best way to do this will help me to cost parts for the job and to plan my trenching. Also give me some know how when discussing options with my electrician (I haven't employed one yet)
Click to expand...


Very true mate.

The thing is, your electrician will give you all this info.  Where best to dig trench & at what depth......

Wiring wise, I would go with what I suggested above.

 
Justin, no one is trying to throw the book at you merely trying to ascertain your level of knowledge and competence, this is a public forum and the works you are asking about are quite comprehensive, so you must understand the we as the professionals must ensure that any advice offered is not misunderstood nor abused. 

What location are you in as it may be local to one of us, it may save you searching for an electrician. 

There is quite a bit of technical know how involved with what you need/want, some of which may only be obtainable from a site visit. 

If you are asking for options only then there are probably multiple solutions, each of which require different trench routes etc. 

How far is the bore pump from the shed?

Is it closer to either the shed or house? 

 
cables.jpg

Each grid square is approximately 30m x 30m. Single phase supply. As you can see, running everything from a cu in the house would mean a lot of cable

 
As the Spoon said  , no cable sizes for various reasons  , I've sketched what the Spoon said which is what we'd all think I'd guess ,  just don't know the layout .

You are limited to what you can fit in a meter cupboard along with meter etc  but there should be no problem with what I've sketched .  

Not knowing the layout you're spark may elect to take Shed & Borehole cables back separately to  C/U .   

Scan0001.jpg

 
Last edited by a moderator:
To be honest, I'd put an external enclosure at the metering point feed that directly from the meter, and fit a board in there and feed the 3 supplies out independently.

If the design is done correctly then selectivity can be achieved and all should be fine.

 
I would concur with Sidey, as this would be my approach also, minimising your trench work.

so from the metering intake you’d place said external enclosure adjacent. 

Then dig a trench to shed. 

Then dig a trench to house. 

Along this trench you would dig a Sweeping bend to bore pump. 

Lay a black duct 50mm dia in trenches for each separate feed that’s 3 ducts for clarification. Make sure you put a suitable draw cord in each duct run for pulling cable through at later date. 

Trench should be a minimum of 500mm deep. Back fill with appropriate aggregate and sand, remember to place ‘electrical warning tape 100mm above duct. 

You will then have adequate trenching for your electrician to pull cables. 

Reminder all bends to be sweeping not tight. 

 
To be honest I've always used a min of 75mm regardless, and no bends, straight runs with the duct bent into slow curves, and chambers at suitable points for pulling.

The duct really needs to be the right stuff too.

 
Sharpend said:
Trench should be a minimum of 500mm deep.
Click to expand...


I thought that the minimum depth was 600mm deep.

Happy to be corrected but 0.6 m is what I've seen in the regs.  Granted they are in section 705,  708 & 730.

Where does it state 500mm? 

 
Sidewinder said:
To be honest I've always used a min of 75mm regardless, and no bends, straight runs with the duct bent into slow curves, and chambers at suitable points for pulling.

The duct really needs to be the right stuff too.
Click to expand...


Ducting for armoured cable? DNO don't even duct their cable unless under traffic area. Trenched for 3 phase and service cable a few years back. Only one small bit of duct where it went under field that would be ploughed? Yes, enclosing cabinet to make space for a distribution board was what I had thought originally. Maybe then cable to shed, cable to house and then cable from house cu to borehole.

 
Last edited by a moderator:
Ground type Depth to top of cable / duct
Unmade, cultivated, or footpath  450mm
Driveway or road   600mm
Agricultural  1000mm

According to SSE

 

 
Last edited by a moderator:

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