Aico Carbon Monoxide Detectors
This official sponsor may provide discounts for members

Discuss Consumer unit replacement in the Electrical Forum area at ElectriciansForums.net

Welcome to ElectriciansForums.net - The American Electrical Advice Forum
Head straight to the main forums to chat by click here:  American Electrical Advice Forum

Hi, we have been asked to relocate a consumer unit however the meter cupboard will be on an outside wall 7m away from the consumer unit, the main switch is under 80amp, im just wanting some opinions on the way to overcome this, am I right in thinking I could run 16mm swa from the consumer unit, cleated to an outside wall, running to an adaptable weatherproof box situated next to the meter cupboard, then using Henley connector blocks, i could connect the swa to the tails coming from the meter box.
 
  • Thread Starter Thread Starter
  • #3
Bear in mind any requirements for fusing.
I will keep that in mind, but would you agree with the procedure I stated?
 
  • Thread Starter Thread Starter
  • #6
Is the meter box surface or flush?
Theyre installing it friday but im pretty sure its surface
 
  • Thread Starter Thread Starter
  • #8
That makes things a lot easier then..
What is going where the old cu is located?
Can the isolator go there?
Its a temporary thing at the moment, the meter is being moved friday but for now until a few months down the line the cu is staying where it is, then eventually it will moved behind the meter cupboard, so really for now I need to connect the exsisting cu to the new mrter cupboard
 

Charlie_

-
Arms
So can you put an isolator (fused) behind the meter cupboard?
Then go from there in swa to cu
 
  • Thread Starter Thread Starter
  • #11
That would make sense yes! Am I right in saying by using 16mm swa cable the fused isolator will be an 80amp fused switch?
I will have to see the situation behind the meter cupboard, the other alternative would be to mount an adaptable box next to the cupboard as an enclosure for the fused switch
 

Charlie_

-
Arms
I would go for 63 amp tbf
 
  • Thread Starter Thread Starter
  • #14
That was going to be my other suggestion but you will need to go bottom entry into the meter box
Okay I appreciate the help do you not think if I surfsce mount the adaptable box I could drill a 20mm hole out the side of the meter cupboard and connect via conduit to the adaptable box?
 

Charlie_

-
Arms
The meter boxes have knockouts in the bottom that can be reinstated later on..
I would come out of the bottom in trunking and then go bottom entry into an enclosure with the isolator inside.
We’re supposed to use designated entry points in the meter boxes
 
  • Thread Starter Thread Starter
  • #16
The meter boxes have knockouts in the bottom that can be reinstated later on..
I would come out of the bottom in trunking and then go bottom entry into an enclosure with the isolator inside.
We’re supposed to use designated entry points in the meter boxes
Ok thankyou for your help! Ill will get all the info needed tomorrow to be more certain and will post updates, i appreciate it
 
  • Thread Starter Thread Starter
  • #17
Ok thankyou for your help! Ill will get all the info needed tomorrow to be more certain and will post updates, i appreciate it
Hi I know it isnt
Ok thankyou for your help! Ill will get all the info needed tomorrow to be more certain and will post updates, i appreciate it
the dno will be coming tomorrow but im not sure if they will use a 100amp with 25mm tails or an 80amp, its more likely going to be a 100amp switch but as the job is temporary and the house load will not even exceed 80 amps let alone 100amps do you think it would be fine to connect a 16mm cable from the meter to the vonsumer unit even if the dno use 25mm tails or shall I use a 25mm cable too
 
  • Thread Starter Thread Starter
  • #18
Obviously once the job gets going in a few months i will upgrade the tails to 25mm once we move the consumer unit closer to the meter
 

davesparks

-
Mentor
Arms
Esteemed
That would make sense yes! Am I right in saying by using 16mm swa cable the fused isolator will be an 80amp fused switch?
No you are approaching this incorrectly, you don't pick a cable size then work backwards to the fuse size. You need to establish the design load and then work through the calculations to establish the correct fuse size then the cable size.
 

davesparks

-
Mentor
Arms
Esteemed
as the job is temporary and the house load will not even exceed 80 amps let alone 100amps do you think it would be fine to connect a 16mm cable from the meter to the vonsumer unit even if the dno use 25mm tails or shall I use a 25mm cable too
Whether it is temporary or not it needs to be carried out in accordance with bs7671 including initial verification.
It won't be fine to connect a cable directly from the meter to the CU, if the length is 7 metres, regardless of what size it is.
 
D

Deleted member 26818

No you are approaching this incorrectly, you don't pick a cable size then work backwards to the fuse size. You need to establish the design load and then work through the calculations to establish the correct fuse size then the cable size.
I wish that still were the case.
Now we have to use 25mm2 tails irrespective of the load, just because there may be a 100A DNO fuse.
We also (since the 18th) will have to use 100A mains switches and RCDs if the manufacturers’ instructions tell us to.
 
D

Deleted member 26818

No. Manufacturers instructions are guidance only and don't have to be followed, especially if they are wrong (which is not uncommon).
Unfortunately where it comes to DBs, the 18th now requires us to comply with MIs.
 
D

Deleted member 26818

Another reason not to use sy and only basec approved cables
 

Charlie_

-
Arms
For those that have never read any
 

Attachments

SuperlecDirect - ElectriciansForums.net Electrical Suppliers
This official sponsor may provide discounts for members

Reply to Consumer unit replacement in the Electrical Forum area at ElectriciansForums.net

Aico 3000 Range
This official sponsor may provide discounts for members
Top Bottom