Electricians advice needed

Discussion in 'Off-Topic Discussion' started by Steve R, Jan 11, 2012.

  1. Steve R

    Steve R Soil Furtler

    Joined:
    Feb 15, 2008
    Messages:
    3,892
    Gender:
    Male
    Occupation:
    Carer
    Location:
    Cumbria
    Ratings:
    +3,703
  2. Scrungee

    Scrungee Well known for it

    Joined:
    Dec 5, 2010
    Messages:
    16,524
    Location:
    Central England on heavy clay soil
    Ratings:
    +28,998
    My understanding of the 'relatively' new Building Regs affecting outdoor electrical installations (+ indoors in kitchens, bathrooms, etc.) is that if your appliance such as a greenhouse heater, fan, propagator, etc, is connected via a plugged in extension lead, rather than 'hard wired' you can do it yourself, but suggest you confirm that with your local Building Control Department. Obviously if connecting via a plugged in lead, a 'splash proof', RCD protected (if your consumer unit doesn't have appropriate RCD protection\) would be required.

    If you don't know what you're doing, or are not permitted to do it yourself, employ a qualified electrician.
     
  3. Steve R

    Steve R Soil Furtler

    Joined:
    Feb 15, 2008
    Messages:
    3,892
    Gender:
    Male
    Occupation:
    Carer
    Location:
    Cumbria
    Ratings:
    +3,703
    It's okay to use, I just windered about the cable,,ie what type do I need to ask for when I go to purchase a longer length. It's currently fitted with some rubberised stuff. I know nowt about electics so I dont know what I need to buy.

    Steve..:)
     
  4. MichaelJohn

    MichaelJohn Gardener

    Joined:
    Oct 19, 2011
    Messages:
    442
    Gender:
    Male
    Location:
    Essex
    Ratings:
    +309
    Steve you will be ok with this stuff , but buy rubber as its easier to use and more flexible than the standard plasticy stuff they sell .. best place to buy it is in an Electrical Wholesalers where they will cut it to your requirements
    This is 1 .5 which is ok for most lighting and pumps etc .. if your going to be plugging in kettles or electric fires then your gonna need 2.5 .. Micky


    [​IMG] Black Sheath
    General Purpose - Rubber Flexible CableApplication: Designed primarily as a trailing cable for use in the supply of
    power for portable or mobile tools and equipment
    Suitable to operate under light stress in dry or damp conditions.

    Current Rating: 16 Amps







     
  5. watergarden

    watergarden have left the forum because...i'm a sad case

    Joined:
    Jan 14, 2007
    Messages:
    946
    Ratings:
    +549
    The idea of those "kits" is that the socket sits on the wall outside and the cable is run INSIDE.
    The reason is, that if you use ordinary flex it may perish / rot after a while because its simply not up to the job.

    If I were you I would move the socket outside closer to where you are going to plug it into inside.

    If you really still want to change the cable you should use "arctic blue" cable such as shown below. (It is made for use outside)

    [​IMG]

    You can guess why its called arctic blue. I doubt a wholesaler will "cut to your requirements" as its not that expensive. Believe it or not, you can get it in a well known orange and black diy store (just like that picture)

    The "rule" that you are looking for is not, its a building regulation called "part P" (honest)
     
  6. JWK

    JWK Gardener Staff Member

    Joined:
    Jun 3, 2008
    Messages:
    32,752
    Gender:
    Male
    Location:
    Surrey
    Ratings:
    +50,831
    The size of the cable (i.e. conductor diameters, 1mm, 1.5mm, etc) depends on the required length and what you intend to run off it. So you need to tell us the overall length and the power requirements.
     
  7. Steve R

    Steve R Soil Furtler

    Joined:
    Feb 15, 2008
    Messages:
    3,892
    Gender:
    Male
    Occupation:
    Carer
    Location:
    Cumbria
    Ratings:
    +3,703
    John,

    Just a 300watt soil warming cable in one plug and a frost free heater in the other, and 5 metres in length.

    Steve...:)
     
  8. shiney

    shiney President, Grumpy Old Men's Club Staff Member

    Joined:
    Jul 3, 2006
    Messages:
    64,139
    Gender:
    Male
    Occupation:
    Retired - Last Century!!!
    Location:
    Herts/Essex border. Zone 8b
    Ratings:
    +125,279
    Steve, as you know, I'm definitely not a DIY person but some thoughts occur to me. I presume you are wanting to run power from your house to the greenhouse. In which case I guess you wish to make it a fairly permanent feature.

    I would be inclined to get a heavy duty cable, something like watergarden shows, and the advice of the shop but the concern must also be for making the exposed cable safe.

    What I did, many years ago, was run the cable (made for outside use) on a catenary cable from my loft and then down a pipe attached to the end of the greenhouse - and then fixed the sockets (protected from water) on a board inside the greenhouse. The sockets I fitted inside the greenhouse were special weatherproof ones and I think you can buy the modern version for under a tenner.

    Running it on a catenary cable is probably not allowed anymore and it's likely that the cable needs to be run underground. Mine has been working with no trouble for 35 years and the birds, especially the swallows and martins, love the cable. They sit there and feed their young in the spring.
     
  9. Steve R

    Steve R Soil Furtler

    Joined:
    Feb 15, 2008
    Messages:
    3,892
    Gender:
    Male
    Occupation:
    Carer
    Location:
    Cumbria
    Ratings:
    +3,703
    Thank you Shiney, since I've had the greenhouse erected I have wanted power in it, and a few years ago I spoke to an Electrician about it, who just happened to be doing some work on our premises.

    He stated that the greenhouse would have to have a "consumer unit" to comply with regs (cost around £200.00) plus wiring, rcd's and time to fit whole job would be around £300.00+ and the cable would now have to be buried 400mm down and taped. Since we have a concrete path, that cannot be done without even more expense, that's "if" we could find the intial £300..

    So we forgot about the idea, until when speaking to another spark in our area he mentioned about the outside plug and that you could buy a kit for £20. So I have bought the kit but the cable is just not long enough. I looked on the web for cables and came accross this page https://www.electriccableco.com/ then realised I needed some help to choose the correct cable, and that's where I am at now.

    I need 5 metres of cable fit for outside use, but wish to keep costs down ( a coil of the arctic blue costs £41 for 25 metres, I need only 5) So if the actic blue cannot be split is there a name of a cable suitable for use that I can then go to a store with and ask for by name?

    Steve...:)
     
  10. lazydog

    lazydog Know nothing but willing to learn

    Joined:
    Jun 30, 2011
    Messages:
    790
    Gender:
    Male
    Occupation:
    waiting to win the Lotto
    Location:
    Black Country Nr Dudley
    Ratings:
    +641
  11. watergarden

    watergarden have left the forum because...i'm a sad case

    Joined:
    Jan 14, 2007
    Messages:
    946
    Ratings:
    +549
    The maplin cable linked is NOT suitable for this situation.

    Perhaps the electrician was having a bad day? as a "garage consumer unit" does not cost £200, more like £30 Click me

    [​IMG] Just like this one (available from tool station / and screwfix)

    Again, he is not right with the cable run. Ideally yes, it should be buried, but yes it can go over head if supported on a catenary cable, or you can "clip" it to a solid structure, but a fence is not considered to be a solid structure but a garden wall is.

    However this brings up another problem.

    As we now know what its for, its a fixed installation, as its in a "special location" you have to get building control or a part p registered electrician to do it for you. BUT, you can take your idea to the next step.

    Either way you can not clip a flex to an external wall as it has no mechanical protection. (and cable nailed in clips fail after some time) There is a kit that has wire armoured cable, which has a plug at one end and a socket at the other, garden centres sell them, but I can't remember the name, they are just what you really need.

    Look at it this way, do it once, do it right, electricity does not forgive your error.
     
  12. Jack McHammocklashing

    Jack McHammocklashing Sludgemariner

    Joined:
    May 29, 2011
    Messages:
    4,427
    Gender:
    Male
    Occupation:
    Ex Civil Serpent
    Location:
    Fife Scotland
    Ratings:
    +7,393
  13. JWK

    JWK Gardener Staff Member

    Joined:
    Jun 3, 2008
    Messages:
    32,752
    Gender:
    Male
    Location:
    Surrey
    Ratings:
    +50,831
    Going by your power requirements you do need 1.5mm 3 core. If you have a TLC near you they are much better value than maplin, and they will cut to the length you need, I use them - order on-line for pick up and it saves hanging around in the branch:
    1.5mm 3 Core Arctic Flex Yellow 100M


    As I understand it you are making up mains extension lead, so you do not have to worry about the Part P regs in that case. I do exactly the same as you, my heating cable in the greenhouse is powered by a temp mains extension cable, it all gets removed come the spring so it isn't 'fixed' :WINK1:
     
  14. watergarden

    watergarden have left the forum because...i'm a sad case

    Joined:
    Jan 14, 2007
    Messages:
    946
    Ratings:
    +549
    Nice jack, but you need special glands for steel wire armoured cable, which if you don't know how to fit one can be a pain, the kit I mentioned has it done for you in such a way you don't take them off.

    [​IMG]

    SWA cable gland

    __________________________________________________________

    As an aside, yellow cable is used to signify 110v, blue is for 230v

    Just because "it works" does not mean it is right, look what happened to the Titanic.
     
Loading...

Share This Page

  1. This site uses cookies to help personalise content, tailor your experience and to keep you logged in if you register.
    By continuing to use this site, you are consenting to our use of cookies.
    Dismiss Notice