prawnabie
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| posted on 27/4/16 at 10:58 AM |
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OT - one for the sparkys - PME electric supply to garage
Hi all,
I've pretty much got my garage in a position where I can work in it, just need to get an electric supply in there!
I have spoken to an electrician and he reckons he can just take a feed from a new MCB in the house CU in t+e to a metal box in the meter cupboard and
run 3 core armoured cable straight out to the garage and terminate it at the metal CU in there. He discounted the fact we had a PME supply as the
garage is less than 5m from the garage.
Now have been reading up on this and it looks like there are lots of opinions on it. Some say exporting the earth from a PME supply is a no no and I
need to fit an earth rod and run a 10mm2 earth from that into the garage and then other say as long as the garage has no incoming metal parts such as
water pipes etc it is ok.
The garage is detached and about 2.5m from the house. it has no water pipes etc and is brick with a concrete floor. has anybody been in a similar
situation and what was done to get a supply to the garage?
Thanks,
Shaun
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nick205
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| posted on 27/4/16 at 01:05 PM |
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Not sure what the rules are on this - I've the benefit of a garage integral to the house with the house consumer unit in the garage. I used a
spare position in the consumer unit and ran a ring in the garage with plenty of sockets on it (more than I'd use at any one time). The wiring
was then changed again by a sparky to feed mains to an added conservatory via armoured cable. The wiring (including the garage ring) and consumer
unit was then tested and passed by the sparky.
I'd suggest getting advice and quotes from say 3 sparkys to see what each recommends to you.
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prawnabie
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| posted on 27/4/16 at 01:48 PM |
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Thanks for the info but that's not what I was asking!
P.S Why do the vast majority of your posts start with "not sure" or I "don't know but"? Not having a pop but seems like
you are just trying to get your post count up!
I have asked this on other more specialist forums but I know there are a few electrical peeps on here so would like to heard what they have to say!
Shaun
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hizzi
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| posted on 27/4/16 at 02:50 PM |
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my garage is 10 meters from the house with pme . garage is fed with 3 core armoured with no earth spike , garage unit is plastic with the earths
attached.
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prawnabie
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| posted on 27/4/16 at 03:43 PM |
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Thanks for the reply!
At least I know the sky won't fall in on me! I don't suppose you know if the armor is used as an earth as well as do you? And if so is it
connected at just the house end or both?
Thanks a lot,
Shaun
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robinj66
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| posted on 27/4/16 at 04:44 PM |
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It is good practice to earth the armour at each end - there is a ring supplied with the
gland kits. I was advised to use 10mm earth wire terminated
incrimp lugs . It is connected to the earth bar within the CU.
Given the short distance from house to garage there shouldn't be any disparity between the earths but , as always, it should be signed off by a
proper sparky
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slingshot2000
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| posted on 27/4/16 at 04:44 PM |
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The armour should NOT be used as the earth if a 3-core cable is being used, BUT the armour should BE earthed !
Personally, I would connect both ends of the armour to the earth terminals in the consumer units at each end.
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robinj66
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| posted on 27/4/16 at 05:22 PM |
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Sorry - I should have said that the armour is earthed in addition to the earth cable of the twin & earth
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prawnabie
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| posted on 28/4/16 at 09:26 AM |
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Thanks for all the info, I think i'm going to run 10mm2 swa under the patio for him!
Thanks,
Shaun
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The Knobs
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| posted on 28/4/16 at 09:47 AM |
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Best practice is to use 3 core swa but separate the earth of house from garage earth. Easily done using insulated box for termination in the garage
meaning the armoured is earthed from house supply. Then use an earth stake for garage earth and you MUST use rcd protection on the garage circuits.
Just be aware if you sell your house the buyers will require certification for any Part P scam certifiable work, which this is.
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prawnabie
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| posted on 28/4/16 at 10:06 AM |
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Hi,
No problem with Part P, they guy who is more than likely be doing it is full ticket. I was just confused as there are so many different opinions on
it. The are are no extraneous metal objects/pipes etc in the garage so most of the literature says as long as the CPC (which would in this case be one
of the cores) is equal to the bonding in the house (10mm2) then all is ok - its just the supplier that might have a problem!
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nick205
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| posted on 29/4/16 at 09:58 AM |
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quote:
Originally posted by prawnabie
Thanks for the info but that's not what I was asking!
P.S Why do the vast majority of your posts start with "not sure" or I "don't know but"? Not having a pop but seems like
you are just trying to get your post count up!
I have asked this on other more specialist forums but I know there are a few electrical peeps on here so would like to heard what they have to say!
Shaun
Hi Shaun
Apologies - I must admit I hadn't realised I started my replies in that way or that it may be an issue. In some cases I know there are specific
rules or laws about things, but may not have that knowledge myself. In many cases I have solved or overcome similar issues myself and feel it useful
to add my experience on the subject.
Again my apologies if it's caused an issue - just trying to contribute my two penneth 
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v8kid
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| posted on 29/4/16 at 11:34 AM |
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quote:
I hadn't realised I started my replies in that way or that it may be an issue.
Not an issue with me
Cheers!
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
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prawnabie
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| posted on 30/4/16 at 07:18 AM |
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quote:
Originally posted by v8kid
quote:
I hadn't realised I started my replies in that way or that it may be an issue.
Not an issue with me
Cheers!
No ass kissing please it was just a question!
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v8kid
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| posted on 30/4/16 at 09:34 AM |
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quote:
Originally posted by prawnabie
quote:
Originally posted by v8kid
quote:
I hadn't realised I started my replies in that way or that it may be an issue.
Not an issue with me
Cheers!
No ass kissing please it was just a question!
Jings it's not just part P you're confused about!
Cheers!
You'd be surprised how quickly the sales people at B&Q try and assist you after ignoring you for the past 15 minutes when you try and start a
chainsaw
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JoelP
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| posted on 1/5/16 at 07:53 PM |
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It makes no difference how they do it. A very minor technicality. I believe you're meant to use the house earth to protect the cable and a rod
to protect the garage circuits, but in reality rods are shite, so either don't bother, or link them allttogether. It really makes no difference.
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