Moving Kitchen

[Rodrayner]

Hi,

We are having our kitchen moved into another part of the house which already has electric via an existing ring main. The kitchen will have an gas / electric oven and a small electric water heater for a sink plus a small water pump.

We will be having an electrician do all the electrical work but before we appoint one we are have some ground works carried to run new sewage pipe down to the room and while this is being done we want to run electrical cable to the room also. Unfortunately due to the layout of the house we can not run mains electric inside the house as it would mean taking up wooden floors etc.

We already have a large consumer unit already which apart from other circuits includes dedicated RCD Breakers for the existing kitchen ring main and cooker. These will become redundant.

I know the cooker will need a dedicated connection. We will put in a new dedicated ring main for the new kitchen and it is suggested that the water heater & water pump also have dedicated connections.

What I need to know before ground works are started is...

Do we run in separate armoured cable in for each connection back to the existing CU. i.e. Cooker ( 4mm ) , ring main ( 2 x 2.5mm ), water heater ( 2.5mm ) & water pump ( 2.5mm )... presuming that's 5 x cables of the required size
Or
Can we run in a single cable and put in a new additional consumer unit that just services the kitchen and required circuits... if so what size ?

The run is around 25 meters and will be an outside run around 1 metre underground and backfilled. The existing consumer unit is already located on the back of an outside wall and the plan is to take any new cables up to the outside wall of the new room.

Please note all we will be doing is running in cable during ground works, we are not attempting to connect anything up. I just need this doing while the diggers are here. So far we haven't chosen an electrician as the electric work is not need for several months or we would simple ask for there advice.

If more info is needed please ask.

Many Thanks in advance for any assistance... Rod

 

[telectrix]

i would be inclined, from your description to run a single SWA cable from the meter via henley blocks in a small enclosure to a 3/4/way CU serving the kitchen. if you put in a duct with a draw rope, then your electrician can pull in whatever cable he calculates is correct for the load.

 

[Dean182]

Just install a duct?

- - - Updated - - -

Beaten to it.

 

[jaydee81]

would install 16mm swa to separate consumer unit in kitchen fed by 60 amp sw fuse

 

[Rodrayner]

Hi everybody. Thank you for such quick replies.

Great to see three answers all saying the same thing, looks like a separate CU is the way to go.

Great idea re the duct and draw lines, unfortunately it will have to go round several bends so not sure how well it will work. I think the best way forward would be to run in both a duct with draw line but also run in the cable as well just in case the duct fails.

I think I will go with the 16mm as the next size up is 25mm which seems a bit over eth top as that's what looks like comes into the house for everything.

Once again, thanks for all your helps

Regards...Rod

 

[Octopus]

Not wishing to dampen your enthusiasm, but you really should get a sparky to site, to consult and check with you what you are planning as you will need this signed off.

 

[Rodrayner]

Hi Murdoch,

Thank you for taking the time to reply but I really do not feel it is fait on any tradesman to ask them to come round and give free advice when I can not guarantee they will get the work and I have no requirement for any other electrical work for several months. As I have already said we are simply wanting to put wire in a hole while it's there, that is where our involvement will finish. I know the work has to be carried out by a qualified sparky as part of a Part P installation, I simply wanted advice on what option to choose.

Thanks for the input... Rod

 

[telectrix]

as long as you don't put sharp bends in the duct, a cable should pull through. a 2½" or 3" duct should be adequate.

 

[Octopus]

Hi Murdoch,

Thank you for taking the time to reply but I really do not feel it is fait on any tradesman to ask them to come round and give free advice when I can not guarantee they will get the work and I have no requirement for any other electrical work for several months. As I have already said we are simply wanting to put wire in a hole while it's there, that is where our involvement will finish. I know the work has to be carried out by a qualified sparky as part of a Part P installation, I simply wanted advice on what option to choose.

Thanks for the input... Rod

No problem matey. I will go and look at most jobs I'm asked to do, and yes this does sometimes involve work may months in advance, sometimes pre planning permission. I don't charge for such visits, nor givbe away too much info but, and this is a but, often homeowners haven't thought of many of the aspects of what they have in mind and you should bear this in mind.

Unless of course, you turn out to be a poster who has no intention of using a sparky and expects advice, day in, day out, FOC

 

[Engineer54]

The ducting needs to be designed to enable a smooth pull of a 16mm 3 core SWA. This will involve the use of ''long bends'', not your usual right angle bends. We never use anything under 50mm ducting, but you may well get away with a 32mm duct....if designed and installed correctly!! Too many bends and it'll be a dead duct!! lol!! Oh, and make sure that any back-filling and compaction doesn't damage the duct....

Best get in an ''Experienced'' electrician to design and install this duct, and even install the cable, while he's there. Treat as a separate work element, not connected in any way to the future kitchen installation.