2.5mm Armored Cable to Shed Help Needed


Postby paultoolbox » Sat Sep 23, 2017 1:48 am

hello
can you advise please i`m running a 2.5 armored cable to my shed
the length of the run is just over 35M

items from B&Q
Prysmian 3 Core Armoured Cable 2.5mm² Black 50m
Price £72

British General 40A 3-Way Garage Kit with 2 MCBS
This 40A 3 way garage kit is suitable extensions or additions
Comes with - 1 x 32A MCB, 1 x 6A MCB. DIN rail, neutral cable, neutral and earth terminals and busbar
MCB - 2x MCBs (1x 6A & 1x 32A)
Price £40

i enclose a photo of consumer box the water heater fuse is no longer needed
as i have a combi boiler now

can you advise what MCB needed in my consumer box 32amp or higher ?

about the armored cable better to dig a trench 1ft deep
or could i pin it to my wall
thank you for any of your advise Paul
Attachments
consumer box 3(800x600).jpg
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Postby Mr White » Sat Sep 23, 2017 6:56 am

It depends on the load and the distance as to what the size of the cable should be. We know the distance is 35M which I would say is ok for a lamp or two, but anything else you are going to need a bigger cable.
Also are you aware that this is notifiable to the LABC as it comes under part P of the building regs. (In short as a "handyman" you are not allowed to do this job unless you get it certified)
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Postby BLAKEY1963 » Sat Sep 23, 2017 10:20 am

PaulToolbox

For the consumer unit you have specified , the 2.5 would be too small.
As already stated , this is notifiable works.
I Assume you have an Electrician with you who can test , inspect and certify the work.
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Postby ericmark » Sun Sep 24, 2017 10:04 pm

Assuming used for lighting then 13A will allow around 32 meters of 2.5 mm cable before it exceeds permitted volt drop. So no point using consumer units when maximum is 10A will allow 43 meters so if following to the letter then 10A fuse in a FCU feeding shed with a switched FCU in the shed with 3 amp fuse for the lights.

Be aware Part P varies through the UK.
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Postby paultoolbox » Tue Sep 26, 2017 11:50 am

thanks for reply's
i want to run a fridge freezer and a light so one double socket and a light

Prysmian LV Armoured 6943X 3-Core Cable 4mm² x 50m Black (92129)
Prysmian LV Armoured 6943X 3-Core Cable 6mm² x 50m Black (36123)

would it be better to run a 4mm or 6mm armored cable instead of 2.5mm ?
what size mcb at consumer box in house should i use 45amp ?
and OK to pin to wall
if i do the work myself i`ll find and ask a electrician to check for me
thank you paul
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Postby ericmark » Sun Oct 01, 2017 11:55 pm

I would say 6 mm with 6 mm at 26 amp you can run up to 66 meters installation method C and with 4 mm at 26 amp you can run 43 meters this is not allowing for volt drop in the out building.
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Postby paultoolbox » Mon Oct 02, 2017 11:42 pm

thank you all for your advice
paul
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