Hi I want to run power down to a summer house could someone advise me please Its less than 25m from the house and the cable will be under ground there are 3 double ring main socket and a single light circuit going to a small garage type consumer unit inside the summer house. The lights are LED spotlights 4W And the plug sockets will run a 2KW heater in the winter And I will over estimate another 3KW So a 5KW and 22amps draw maximum at one time what size Armoured cable should I use will 3 core 2.5mm be ok or should I go higher, I think the maximum draw will be less that 3.5KW. I have done some calculations and 2.5mm should be ok Any Advice would be appreciated Andy
My advice is as follows. . All that you surmise to do will be done by your spark as he is the one that will design install certify and notify Building control as all of this comes under the law of the land my old flower and is not a DIY task Building control will send a spark out to inspect your job but expect to stump up at least £300.00 for the privilege A self certification electrician will be the fraction of the cost BUT will not use his license number for YOUR work you have done yourself Do it correctly as you don't want this to bite you in the **** upon the day you want to up and move! 10+ years down the road and the word has still not gotten round regarding Part P!
Sorry should have said I know you election get touchy about this, I will be just laying the cable but an election will make the final connection at both ends as money is tight although I am a fully qualified auto election used to working with looms over 300 individual wires. The cable will be buried at a depth of 3ft on a gravel bed covered in sand then covered with 12inc of soil then a strip of yellow Warning buried Cable tape over the length of the cable then the rest of the soil covering that. I will video the important parts of the cable laying so the election can see how it was done if they want, I want to get this done myself to save a bit of money, would like some advice what size cable to fit don't want to go over the top with the cable as nothing else will be added to this I don't expect the max load will reach 3Kw.
May be a kettle and the 2 Kw heater in the winter a little radio with a transformer on it plug the lawn mower in but not all at once. it just a summer house I am not looking at spurring off to other builds.
Use 6mm An - its a lot of graft to run the cable. I like the 3 core you portray, cannot stand 2 core with armour as cpc, its not cricket..even though the tables might show it as ok. What supply type are you on An? And don't forget about discrimination - ie "2.5mm - say 20 amp mcb at db1, then at db2 what are you going to switch? 10 amps? Hence the 6mm. Myself would use 10, but I am only diy.
Someone with brains,it infuriates me as well, it's such a shoddy way of doing it, 2 core with armour as cpc. Last lot of swa, I got from here. http://www.superlecdirect.com/p-xlp...7-steel-wire-armoured-cable-harmonised-cores/
240V straight from main fuse box B40 5940S nothing else will run off so its got it's own dedicated supply
An I've got to go but use 6mm - but hey at the end of the day you do what you want to. Is your supply type at db1 (house) TT?
That's a good link Mr K - never seen that company before..the cost difference's really are negligible between the cable sizes.
Got some of this in 2.5mm for some outside lights from there,I'm old school, prefer invidial coloured cores, rather than sleeving a core or using armour for cpc. http://www.superlecdirect.com/p-xlp...teel-wire-armoured-cable-brnbluegrn-yw-cores/