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  • #1794901
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    Peadairbd
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    Joined: 17 Sep 2017
    Location: N/A
    Total posts: 8

    Hi. Having difficulty getting consistent info on what size cable I need to connect my new build to the EDF box which is 120 metres away. Will EDF tell me? I have been told I might need it as big as 70mm. It will be laid underground.  Any advice appreciated. What I really want is the the spec so I can search for a decent price. Quoted €1900 for 25mm cable.


    #1794978
    robertarthur
    robertarthur
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    Joined: 29 Nov 2010
    Location: Nièvre (58)
    Total posts: 2157

    The E(R)DF is only responsible for the other side of the EDF box , NFC 14-100 regs. From the box it is NF C 15-100,  côté privé. A so called type 2 connection to the grid.  In the latest revision of the French electrical code, the Amendement 5, this table. For a max voltage drop of 2 %. If you also want to install a tableau secondaire have a look at type 4 in this summary.


    RA

    #1794981
    le-dolly
    le-dolly
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    Joined: 16 Nov 2009
    Location: La Souterraine-23 Depuis sept 2005
    Total posts: 1230

    Using 70mm² will give you a measurment of 117 mts at 6o A, you could probably get away with this. Using 70mm² at 45 A will give you a length of câble of upto 156 mts, but that may not be sufficient for a large all electric house. 25mm² is a non starter over that distance, forget it.


    Le-Dolly ( . )( . ) http://www.pink-electrique.fr

    #1794996
    badger
    badger
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    Joined: 04 Dec 2008
    Location: Near Vire (14)
    Total posts: 1408

    Hello – we’ve spoken about this previously, but it went a long down my list as my past year has been somewhat disjointed due to family bereavements. Anyway…..

    To add to all the above – whoever told you to use 25mm² copper for that distance doesn’t understand about volt drop. If we assume that you might need the full 60A/12kVA that ENEDIS can supply via single phase then you need either:

    1. 95mm² copper (though it is marginal – the volt drop on 70mm² hovers around the allowed 2% depending n the power factor you use).

    or….

    2. 120mm² aluminium – this will be considerably cheaper than copper & a lot lighter to pull in to your underground ducts.

    For a 45A/9kVA (max.) ENEDIS supply the above drops to 70mm² for copper & 95mm² for aluminium.

    I’ll try & get you an up to date price for the above options, like I should have done ages ago….. :cry:


    Jonathan Badger - St Germain de Tallevende 14500 http://www.badgerlx.fr

    #1795002
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    Chanceux
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    Joined: 17 Mar 2010
    Location: Picardie
    Total posts: 13130

    I had a similar situation and used alu cable, it had all the benefits that Badger mentions and I cant get my head around why all the allaged French electricians I speak to will only ever consider copper and say I must be mad to use anything else :???:


    #1795003
    robertarthur
    robertarthur
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    Joined: 29 Nov 2010
    Location: Nièvre (58)
    Total posts: 2157

    @ Chancer: fact or fiction, I don’t know, but several French electricians told me (more than fifteen years ago already) that only the ERDF was entitled to use alu cable. Perhaps old regs nobody dared to question or just urban and rural legends.


    RA

    #1795007
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    Chanceux
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    Joined: 17 Mar 2010
    Location: Picardie
    Total posts: 13130

    I have heard that as well, maybe there is a grain of truth in it, I used alu from my outside CCPC to the colonne collectif, it is authorised there but not for the derivation individuelles I believe.

    For some years ERDF have been trying to scam people like me that since the last amendment only they are allowed to install and cable a colonne collectif, I had to fight them for a couple of years over that fake news.


    #1795009
    badger
    badger
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    Joined: 04 Dec 2008
    Location: Near Vire (14)
    Total posts: 1408

    …..that only the ERDF was entitled to use alu cable.

    That’s very definitely not the case. I’ve had many conversations with ENEDIS (no longer ERDF….) technicians about this subject & they have never flagged it up as being only their domain.

    However, I’m guessing confusion has arisen from the fact that us mere mortals working on the NF C 15-100 side of things must use double insulated cable in our underground ducts, whereas ENEDIS are working to NF C 14-100 which allows the use of single insulated stuff upstream of their point de livraison. I’ve had various French clients present me with a large coil of single insulated aluminium conductors to put in as their underground supply, or feed to an outbuilding, who have been a bit miffed when they are told that they can’t use it; their mate who works for EDF/ERDF/ENEDIS (take your pick) who “supplied” it has always told them it will be no problem :whistle:


    Jonathan Badger - St Germain de Tallevende 14500 http://www.badgerlx.fr

    #1795357
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    Peadairbd
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    Joined: 17 Sep 2017
    Location: N/A
    Total posts: 8

    Thanks Jonathan. I have laid the ducting and it measures 118 metres so the 70mm copper or its aluminium equivalent would probably do.


    #1795358
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    Peadairbd
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    Joined: 17 Sep 2017
    Location: N/A
    Total posts: 8

    <p style=”text-align: left;”>Thanks RA, very helpful. Am I right in thinking that I have to get specific coloured core wires and the normal uk colours won’t be acceptable?</p>


    #1795362
    badger
    badger
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    Joined: 04 Dec 2008
    Location: Near Vire (14)
    Total posts: 1408

    Am I right in thinking that I have to get specific coloured core wires and the normal uk colours won’t be acceptable?

    UK colours are now harmonised with Europe, so no issue there. However, you won’t get 2 core in those sizes (in alu or copper). The trick is to use 2 single cores, hence the 240m shown in my privately sent devis. That only comes in black, so one marks the neutral with either blue tape or, preferably, blue heat shrink sleeving.

    Using any kind of cable in these large sizes has the added exepense of needing the ridiculously overpriced “embouts reducteur” or “fouets de raccordement”. However, without them you simply cannot connect either end of such large conductors. These are included in my devis too.


    Jonathan Badger - St Germain de Tallevende 14500 http://www.badgerlx.fr

    #1795394
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    Peadairbd
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    Joined: 17 Sep 2017
    Location: N/A
    Total posts: 8

    Thanks Jonathan, I see that now.


French Electrical & Other Building Issues
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