Viewing 15 posts - 1 through 15 (of 19 total)
  • Author
    Posts
  • #1822890
    honeybeefrance
    honeybeefrance
    Participant
    Joined: 05 Jun 2014
    Location: France
    Total posts: 226

    hi

    if I have say two lighting circuits, one to a bedroom and one to a lounge for example, can those two circuits be joined to one disjoncteur?

     

    thanks in advance


    #1822908
    Avatar
    ail901
    Participant
    Joined: 11 Aug 2010
    Location: Creuse
    Total posts: 499

    Following


    #1822917
    Avatar
    Chanceux
    Participant
    Joined: 17 Mar 2010
    Location: Picardie
    Total posts: 13130

    Yes you can.

    You must ensure that the total lighting load does not exceed the capacity of the cable and the disjoncteur, not likely with modern LED lighting, and that the circuit does not feed more than 8 lighting points, multiple spots fed from one junction box count as one lighting point.


    #1822920
    honeybeefrance
    honeybeefrance
    Participant
    Joined: 05 Jun 2014
    Location: France
    Total posts: 226

    So if one room has say two lights and another has one light, both with separate circuits but attached to one disjoncteur it counts as 3 lighting points?

     


    #1822922
    Avatar
    Chanceux
    Participant
    Joined: 17 Mar 2010
    Location: Picardie
    Total posts: 13130

    To the best of my knowledge yes.


    #1822924
    honeybeefrance
    honeybeefrance
    Participant
    Joined: 05 Jun 2014
    Location: France
    Total posts: 226

    Merci

     


    #1822925
    Avatar
    fittersmate
    Participant
    Joined: 08 Jun 2009
    Location: Brittany France dept 56
    Total posts: 1624

    Yes you can. You must ensure that the total lighting load does not exceed the capacity of the cable and the disjoncteur, not likely with modern LED lighting, and that the circuit does not feed more than 8 lighting points, multiple spots fed from one junction box count as one lighting point.

    <hr />

    This begs the question of:-

    Changing to led lighting reduces the current load by say 80% on a lighting circuit.

    But it would be possible in the future to return to halogen or filament lamps and hence go back to the higher current.

    So,  do lighting circuits have to be sized, (cable size and disconjoncteurs) for the largest current possible, depending on what sort of bulb could be fitted, as there isn’t AFAIK a bulb fitment that is 100% led only?

    Commom sense says yes they do.


    #1822926
    robertarthur
    robertarthur
    Participant
    Joined: 29 Nov 2010
    Location: Nièvre (58)
    Total posts: 2157

    Yes, three.  Circuits, what’s in a name: the French use this name to indicate the wiring feeding appliances from one individual MCB or fuse: 1.5 mm² wiring for lighting with a 10 amp disjoncteur. For sockets: 2.5 mm² and a 16 amp disjoncteurSee this example of Promotelec for a distribution board following the latest Amendement 5 revision of the French electrical code. No special smaller gauge allowed, even if you intend to keep your consumption below one milliamp…….


    RA

    #1822937
    Avatar
    ail901
    Participant
    Joined: 11 Aug 2010
    Location: Creuse
    Total posts: 499

    So a dedicated circuit for a freezer and dedicated circuit for a fridge can be connected to the same disjoncteur?


    #1822942
    robertarthur
    robertarthur
    Participant
    Joined: 29 Nov 2010
    Location: Nièvre (58)
    Total posts: 2157

    The French regulators do like  special circuits, yes. But for a standard fridge a regular socket is enough, sharing one disjoncteur with more general purpose sockets. The freezer (congélateur): it’s advisable to use a specialised circuit, so it keeps functioning when somewhere else something goes wrong. But not a hard obligation for already existing installations électriques. To quote the French electrical code, Amendement 5, para 10.3.4., page 493: “Lorsque l’emplacement du congélateur est défini, il convient de prévoir un circuit specialisé soit protégé par DDR 30 mA, de préférence à immunité renforcée, specifque à ce circuit, soit alimenté par un transformateur de séparation.”

    See  also this document in three languages identifying the usual special suspects. So fridge and freezer on the same circuit doesn’t make you a sinner. The French advice however is a safeguard for what’s inside your freezer, better safe than sorry.


    RA

    #1822951
    Avatar
    Chanceux
    Participant
    Joined: 17 Mar 2010
    Location: Picardie
    Total posts: 13130

    So,  do lighting circuits have to be sized, (cable size and disconjoncteurs) for the largest current possible, depending on what sort of bulb could be fitted, as there isn’t AFAIK a bulb fitment that is 100% led only?

    Of course they do, all circuits have to, the reason is for a short circuit condition, the disjoncteur must break within a minimum time, especially important if its a short to earth, the longer the time in miiliseconds before coupure the higher the voltage will rise on any earthed metallic parts, it has to remain under 50v IIRC.

    Beyond the point d’eclairage/junction box its up to you, i dont see the point of running 1.5mm2 cables to run one 7 watt Led spot.


    #1822995
    Avatar
    fittersmate
    Participant
    Joined: 08 Jun 2009
    Location: Brittany France dept 56
    Total posts: 1624

    And the time for a 10 amp disconjocteur to trip with a dead short on 1.5 sq mm cable is? How many milliseconds?


    #1822999
    robertarthur
    robertarthur
    Participant
    Joined: 29 Nov 2010
    Location: Nièvre (58)
    Total posts: 2157

    One of the technical manuals of HAGER gives an answer: about 0.1 sec for a short, see page 29, déclencheur électromagnétique. Curve B, C or D of such a disjoncteur sets the maximum wiring lengths. Type C for 1.5 mm² copper and 10 amp: 60 meters. Type B 120 m and type D 30 m.


    RA

    #1823000
    Avatar
    Chanceux
    Participant
    Joined: 17 Mar 2010
    Location: Picardie
    Total posts: 13130

    And the time for a 10 amp disconjocteur to trip with a dead short on 1.5 sq mm cable is? How many milliseconds?

    <hr>

    Blowed if I know!


    #1823001
    Hal
    Hal
    Participant
    Joined: 06 Jan 2011
    Location: Limoux, 11300 Aude.
    Total posts: 3793

    Surely now with LEDs being the norm, they will drop the 8 light per circuit rule, no?

    I have 42 LED bulbs up the drive and around the terrace and house with a load of maybe 150W max that used to be fed by six switches. The other day, i said sod it and wired them all into one switch!

French Electrical & Other Building Issues
Viewing 15 posts - 1 through 15 (of 19 total)

You cannot reply to this topic.