Hi,

I want to get a small consumer unit fitted in a shed I will add to my
garden in the next few months. I am about to lay laminate flooring my
my house and therefore want to run the wires under the floor ready for
the connection to the shed.

To save money on the armoured cable I want to run twin core and earth
to a RDC inside the house nearer the shed then the main consumer unit
and then run the armoured cable from there to the new consumer unit.

I only require 1 or 2 double sockets in the shed, an interior &
exterior light hence I will only need a small unit in the shed.

My question is not so much about the set up (although comments on a
better way to do this are very welcome) as I will most likely get a
sparky to do the connecting up etc, instead I want to know what size
TC&E wire I should run under the floor from the main consumer unit to
the position for the rdc and then what type/size?? armoured cable I
should buy to run from the RDC to the shed.

All comments much appreciated.

Cheers,

James

On Fri, 27 Jul 2007 07:06:37 -0700 someone who may be
wrote this:-

My question is not so much about the set up (although comments on a
better way to do this are very welcome) as I will most likely get a
sparky to do the connecting up etc, instead I want to know what size
TC&E wire I should run under the floor from the main consumer unit to
the position for the rdc and then what type/size?? armoured cable I
should buy to run from the RDC to the shed.

What would the length of both sorts of cable be?



--
David Hansen, Edinburgh
I will *always* explain revoked encryption keys, unless RIP prevents me
http://www.opsi.gov.uk/acts/acts2000/00023--e.htm#54

What would the length of both sorts of cable be?

The TW&E would be about 12-15m and the Armoured cable would be
about10m.

Cheers,

James

In article . com,
wrote:
I only require 1 or 2 double sockets in the shed, an interior &
exterior light hence I will only need a small unit in the shed.

My question is not so much about the set up (although comments on a
better way to do this are very welcome) as I will most likely get a
sparky to do the connecting up etc, instead I want to know what size
TC&E wire I should run under the floor from the main consumer unit to
the position for the rdc and then what type/size?? armoured cable I
should buy to run from the RDC to the shed.

All comments much appreciated.

One or two double sockets *could* mean a load of 40 amps or so. You need
to know how much current you are likely to take. You might, for example,
want to run a 3kW heater and an arc welder together while the pottery oven
is heating up. Or only a desk light and soldering iron.

--
*If your feet smell and your nose runs, you're built upside down.

Dave Plowman London SW
To e-mail, change noise into sound.

wrote:

I want to get a small consumer unit fitted in a shed I will add to my
garden in the next few months. I am about to lay laminate flooring my
my house and therefore want to run the wires under the floor ready for
the connection to the shed.

To save money on the armoured cable I want to run twin core and earth
to a RDC inside the house nearer the shed then the main consumer unit
and then run the armoured cable from there to the new consumer unit.

I only require 1 or 2 double sockets in the shed, an interior &
exterior light hence I will only need a small unit in the shed.

My question is not so much about the set up (although comments on a
better way to do this are very welcome) as I will most likely get a
sparky to do the connecting up etc, instead I want to know what size
TC&E wire I should run under the floor from the main consumer unit to
the position for the rdc and then what type/size?? armoured cable I
should buy to run from the RDC to the shed.

All comments much appreciated.

This is a subject that crops up from time to time and is a bit deeper
than many anticipate since there are a number of aspects of the design
that need thinking about.

Have a read of:

http://wiki.diyfaq.org.uk/index.php?...ricity_outside

You proposed setup sounds like one of the simpler arrangements, but
think through your requirements carefully before deciding on a solution.


--
Cheers,

John.

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| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

Hi,

One or two double sockets *could* mean a load of 40 amps or so. You need
to know how much current you are likely to take. You might, for example,
want to run a 3kW heater and an arc welder together while the pottery oven
is heating up. Or only a desk light and soldering iron.

I will only use the sockets for a small water feature pump and lawn
mower and the lights will be a simple 100w inside and about 150w
outside.

Cheers,

James

Run some 10mm twin and earth inside house and 10mm 3 core armour. Protect
the lot with a 40 amp mcb inside main consumer unit.
"John Rumm" wrote in message
...
wrote:

I want to get a small consumer unit fitted in a shed I will add to my
garden in the next few months. I am about to lay laminate flooring my
my house and therefore want to run the wires under the floor ready for
the connection to the shed.

To save money on the armoured cable I want to run twin core and earth
to a RDC inside the house nearer the shed then the main consumer unit
and then run the armoured cable from there to the new consumer unit.

I only require 1 or 2 double sockets in the shed, an interior &
exterior light hence I will only need a small unit in the shed.

My question is not so much about the set up (although comments on a
better way to do this are very welcome) as I will most likely get a
sparky to do the connecting up etc, instead I want to know what size
TC&E wire I should run under the floor from the main consumer unit to
the position for the rdc and then what type/size?? armoured cable I
should buy to run from the RDC to the shed.

All comments much appreciated.

This is a subject that crops up from time to time and is a bit deeper than
many anticipate since there are a number of aspects of the design that
need thinking about.

Have a read of:

http://wiki.diyfaq.org.uk/index.php?...ricity_outside

You proposed setup sounds like one of the simpler arrangements, but think
through your requirements carefully before deciding on a solution.


--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

john wrote:

Run some 10mm twin and earth inside house and 10mm 3 core armour. Protect
the lot with a 40 amp mcb inside main consumer unit.

With respect, this does seem to be glossing over a number of potentially
important points.

The OP s requirements sound like they are unlikely to exceed 3kW, so
even if we allow 4kW for expansion, a 20A supply would be more than
adequate. From a voltage drop point of view 2.5mm^2 cable would just
about be in spec at 25m for that load.

You also need to decide where you will site the RCD. In this
circumstance at the head end of the supply would probably be acceptable.
Depending on the earthing system in user you may or may not have a choice.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\================================================= ================/

You also need to decide where you will site the RCD. In this
circumstance at the head end of the supply would probably be acceptable.
Depending on the earthing system in user you may or may not have a choice.

Thanks for you comments,

I was going to site the RCD where I change from TC&E to the Armoured
Cable is this not suitable. Do I need to run a separate earth cable
will the one in the TC&E nor suffice?

Cheers,

James

wrote:
You also need to decide where you will site the RCD. In this
circumstance at the head end of the supply would probably be acceptable.
Depending on the earthing system in user you may or may not have a choice.

Thanks for you comments,

I was going to site the RCD where I change from TC&E to the Armoured
Cable is this not suitable. Do I need to run a separate earth cable
will the one in the TC&E nor suffice?

You can have the RCD here if you want so long as you have a TN-S or
TN-C-S earthing system in use at the head end. With a TT system at the
head you would need some form of RCD protection at the head end to
protect the T&E from the consumer unit to the point of changeover to SWA.

With RCD protection on the SWA there is no real worry about the size of
the earth. This only becomes an issue when you have a long run that is
not protected by a RCD at the head end, and you need to make sure that
disconnection times can be met in the event of a fault to earth on the
SWA. The RCD makes this issue go away.

--
Cheers,

John.

/================================================== ===============\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
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