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UK diy (uk.d-i-y) For the discussion of all topics related to diy (do-it-yourself) in the UK. All levels of experience and proficency are welcome to join in to ask questions or offer solutions. |
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#1
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What size of sub-main cable and fuse for granny annexe?
Anyone advise what size of cable is required for a sub-main going to a granny annexe? The Annexe/flat has an 8kw electric shower, a 4.5kw cooker and the usual aray of kitchen appliances. Will 10mm˛ twin-core and earth be adequate? It'll need it to pass the part-p certification periodic test. And what size of main fuse is suitable for this sub-main? Thank you, DaveH |
#2
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What size of sub-main cable and fuse for granny annexe?
On Tue, 17 Apr 2007 17:40:55 +0100, DaveH
mused: Anyone advise what size of cable is required for a sub-main going to a granny annexe? The Annexe/flat has an 8kw electric shower, a 4.5kw cooker and the usual aray of kitchen appliances. Will 10mm˛ twin-core and earth be adequate? It'll need it to pass the part-p certification periodic test. And what size of main fuse is suitable for this sub-main? The size on the cable depends on the length, installation method, load etc... You have only given part of the information. Part p isn't a periodic test. Who is doing the commisioning and certification of the installation? 10mm does sound small though, I wouldn't use it as a submain for a flat with electric cooking and heating. -- Regards, Stuart. |
#3
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What size of sub-main cable and fuse for granny annexe?
"Owain" wrote in message ... DaveH wrote: Anyone advise what size of cable is required for a sub-main going to a granny annexe? The Annexe/flat has an 8kw electric shower, a 4.5kw cooker and the usual aray of kitchen appliances. Will 10mm˛ twin-core and earth be adequate? It'll need it to pass the part-p certification periodic test. There's no such thing as a Part-P periodic test. You'll need either a Design, Installation and Inspection and Testing Certificate, or a Minor Works Certificate, OR a building control application to the local council. And what size of main fuse is suitable for this sub-main? If it's a bedsit type annex, integral to the house, with gas or other non-electric heating, I'd suggest a 60A supply using 16mm. For anything larger or if electric heating, treat as a separate dwelling and provide 100A using 25mm. If the annex might ever be used separately (rented out) then it might be worth biting the bullet and getting a new supply from the street mains. Be aware that T&E may not be acceptable with its reduced earth conductor size, and submains are often done in MICC or armoured. 16mm T&E with a seperate 10mm earth seems normal in new build flats around here. Adam |
#4
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What size of sub-main cable and fuse for granny annexe?
On Tue, 17 Apr 2007 21:26:22 +0100, Lurch
wrote: On Tue, 17 Apr 2007 17:40:55 +0100, DaveH mused: Anyone advise what size of cable is required for a sub-main going to a granny annexe? The Annexe/flat has an 8kw electric shower, a 4.5kw cooker and the usual aray of kitchen appliances. Will 10mm˛ twin-core and earth be adequate? It'll need it to pass the part-p certification periodic test. And what size of main fuse is suitable for this sub-main? The size on the cable depends on the length, installation method, load etc... You have only given part of the information. The length of the sub-main cable will be 8 mtrs. Part p isn't a periodic test. Who is doing the commisioning and certification of the installation? Haven't decided yet. 10mm does sound small though, I wouldn't use it as a submain for a flat with electric cooking and heating. The flat would not normally have any electric room heating as it has central heating. DaveH |
#5
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What size of sub-main cable and fuse for granny annexe?
On Tue, 17 Apr 2007 21:22:51 +0100, Owain
wrote: DaveH wrote: Anyone advise what size of cable is required for a sub-main going to a granny annexe? The Annexe/flat has an 8kw electric shower, a 4.5kw cooker and the usual aray of kitchen appliances. Will 10mm˛ twin-core and earth be adequate? It'll need it to pass the part-p certification periodic test. There's no such thing as a Part-P periodic test. You'll need either a Design, Installation and Inspection and Testing Certificate, or a Minor Works Certificate, OR a building control application to the local council. And what size of main fuse is suitable for this sub-main? If it's a bedsit type annex, integral to the house, with gas or other non-electric heating, I'd suggest a 60A supply using 16mm. For anything larger or if electric heating, treat as a separate dwelling and provide 100A using 25mm. If the annex might ever be used separately (rented out) then it might be worth biting the bullet and getting a new supply from the street mains. Seems worth thinking about. Be aware that T&E may not be acceptable with its reduced earth conductor size, and submains are often done in MICC or armoured. OK, many thanks. DaveH |
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