What type of consumer box

[stevenson166]

Hello All, First of all i am not an Electrician just a DIY enthusiast.
I have just built a garden bar shed and have the following in place. Please see images.
Consumer box in the garage fed by the main house supply. Pic shed 5 and shed 6

this then exits the garage by a fused switch

This feed then enters the bar shed and terminates

My question is that i am NOT going to attempt to do this myself, All i want to do is advice on what consumer unit i need to buy so that i can keep costs down. The bar shed will have 6 double sockets and 1 single socket and a light socket, which i intend to have fitted by round conduit.
Any advice greatly accepted.

 

[sinewove]

Hello All, First of all i am not an Electrician just a DIY enthusiast.
I have just built a garden bar shed and have the following in place. Please see images.
Consumer box in the garage fed by the main house supply. Pic shed 5 and shed 6
View attachment 59116
this then exits the garage by a fused switch
View attachment 59117
View attachment 59118
This feed then enters the bar shed and terminates
View attachment 59119
My question is that i am NOT going to attempt to do this myself, All i want to do is advice on what consumer unit i need to buy so that i can keep costs down. The bar shed will have 6 double sockets and 1 single socket and a light socket, which i intend to have fitted by round conduit.
Any advice greatly accepted.

By the looks of the spur in the garage,the most power available in the bar would be 13amps,so any mcbs in the in the shed may be overridden if they are bigger than 10 or 6 amp.So maybe a 10A for sockets and 6A for lighting in a 2 way cu.Hope the cable to the shed is suitable.
Regards,S

 

[ferg]

If it's already fused down to 13A then to save money your electrician could just use a switched fused connection unit at 3A for the lighting.

If it is fused you will have all 6 sockets on a 13A fuse so loading could be an issue depending on what you have plugged in.

 

[stevenson166]

Thanks, I am sure he said it had a 32amp supply but as you have mentioned it is fused at garage exit by a 13amp . Does anyone have a link to a consumer unit i can buy ready for installation

 

[telectrix]

this job needs a bit of a rethink. first you have a RCD in the garage CU, so another one in the shed would lead to problems with discrimination. i.e. a fault in the shed could trip either RCD. and if the whole lot is fed from an RCD protected way in the house, more trouble.

 

[stevenson166]

If its possible to somehow have both the bar shed and garage on the same rcd then thats fine.

 

[telectrix]

simplest way (and cheapest) is as ferg says, wire direct to sockets and fit a FCU (5A) for lights. bear in mind that your max. amperage will be 13A. unless you can replace the 13A FCU in the garage with a 20A MCB in enclosure.

 

[stevenson166]

simplest way (and cheapest) is as ferg says, wire direct to sockets and fit a FCU (5A) for lights. bear in mind that your max. amperage will be 13A. unless you can replace the 13A FCU in the garage with a 20A MCB in enclosure.

So remove the fused outlet and replace with a non rcd enclosure fitted with a 20am mcb ?

 

[sinewove]

simplest way (and cheapest) is as ferg says, wire direct to sockets and fit a FCU (5A) for lights. bear in mind that your max. amperage will be 13A. unless you can replace the 13A FCU in the garage with a 20A MCB in enclosure.

Would,nt you need a 20A dp switch before the 5A FCU to isolate the shed?
S

 

[telectrix]

So remove the fused outlet and replace with a non rcd enclosure fitted with a 20am mcb ?

if the cable to the shed is 2.5mm, then 20A would be the appropriate fuse/MCB

 

[stevenson166]

if the cable to the shed is 2.5mm, then 20A would be the appropriate fuse/MCB

Hi, The cable running from the fused socket in the garage to the bar shed is the following
Electric Cable BS 5467 600/1000V...looks like it fed from the double socket next to it ...see photos...ignore the smaller cable on the outside pic..that is my extension cable

 

[DefyG]

If the armoured cable is 4mm then it could be connected to the socket (assuming the double socket is on a rfc (ring final circuit) protected by a 32A mcb, without any further protective device.
If the double socket is already a 'spur' off the rfc then you need to seek further advice on best way forward.
If only 2.5 sq mm then a protective device will be required (20A mcb!)
RCD protection by one protecting the rfc?
Not sure why there is an IP rated s/fcu in the garage at all?
[automerge]1593463134[/automerge]

Think the armoured cable is 6mm or 8mm

'Thinking' doesn't do it. 8mm is a non standard size so doubt its that.
sq mm refers to the actual cross sectional area of the copper conductor NOT the diameter of the cable/core.

 

[stevenson166]

If the armoured cable is 4mm then it could be connected to the socket (assuming the double socket is on a rfc (ring final circuit) protected by a 32A mcb, without any further protective device.
If the double socket is already a 'spur' off the rfc then you need to seek further advice on best way forward.
If only 2.5 sq mm then a protective device will be required (20A mcb!)
RCD protection by one protecting the rfc?
Not sure why there is an IP rated s/fcu in the garage at all?

Think the armoured cable is 6mm or 8mm
[automerge]1593463068[/automerge]

If the armoured cable is 4mm then it could be connected to the socket (assuming the double socket is on a rfc (ring final circuit) protected by a 32A mcb, without any further protective device.
If the double socket is already a 'spur' off the rfc then you need to seek further advice on best way forward.
If only 2.5 sq mm then a protective device will be required (20A mcb!)
RCD protection by one protecting the rfc?
Not sure why there is an IP rated s/fcu in the garage at all?

If the armoured cable is 4mm then it could be connected to the socket (assuming the double socket is on a rfc (ring final circuit) protected by a 32A mcb, without any further protective device.
Source URL: What type of consumer box - https://www.electriciansforums.net/threads/what-type-of-consumer-box.187941/ That socket is the last one of the circuit of 4 doubles and is protected by a 32amp mcb

 

[stevenson166]

If the armoured cable is 4mm then it could be connected to the socket (assuming the double socket is on a rfc (ring final circuit) protected by a 32A mcb, without any further protective device.
If the double socket is already a 'spur' off the rfc then you need to seek further advice on best way forward.
If only 2.5 sq mm then a protective device will be required (20A mcb!)
RCD protection by one protecting the rfc?
Not sure why there is an IP rated s/fcu in the garage at all?
[automerge]1593463134[/automerge]

'Thinking' doesn't do it. 8mm is a non standard size so doubt its that.
sq mm refers to the actual cross sectional area of the copper conductor NOT the diameter of the cable/core.

sorry i know for a precise answer i should talk precise sizes

 

[DefyG]

It does help.