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Cable size and a second distribution panel
by RobertArthur • Mon 20 Jan 2020 21:37
Recurring questions even in French forums about the connection of a second distribution panel, un tableau secondaire or divisionnaire. To keep it simple only a single-phase example to get the picture. The included table is for a voltage drop of 2%. For 1% divide the maximum distance in half. French lessons: ID = Interrupteur Différentiel = RCD and chute de tension = voltage drop.

Which brings me to another voltage drop example, a closer look at four different connections to the grid and the implications for cable length and size. From theory to practice: you have to run some calculations to figure out the exact voltage drop, every case is different. Do you remember: the type 1 and the type 2 connections to the grid.
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RobertArthur
329
Mar 2009
Re: Cable size and a second distribution panel
by Dave • Fri 22 May 2020 13:20
I've just been reading through this again since I an thinking of adding a second panel myself. It's interesting that you have to include a disjoncteur in the main panel, which seems somewhat redundant, although I suppose it does allow you to work safely on the whole second panel without turning off the power to everything.
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Dave
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Aug 2004
Re: Cable size and a second distribution panel
by RobertArthur • Sat 06 Jun 2020 22:49
Dave, not redundant this disjoncteur. It's there to protect the feed to the tableau secondaire. Probably 2.5, 4 or 6 mm², not designed to carry a possible short current from the main switch, protecting at a much higher rating (30 / 45 / 60 or 75 amps. There we see at least 10 mm² and with the introduction of the LINKY smart meter 16 mm². Modern times: possibility to change your puissance souscrite with a simple mouse click in HQ EDF/ENEDIS, no local inspection necessary, could be risky. Electrical safety is the name of the game. And it has become obligatoire as from 2010 with the introduction of the so called Amendement 3 of the French electrical code. Exit this not uncommon way of distributing power in your house and annexes. The second panel has been promoted to the league of circuits specialisés, protection in the main panel. Even a well respected magazine as SystèmeD seems to live in blissful ignorance, and is still happy to do so.

En tête du tableau secondaire: an interrupteur différentiel, also a local coupure d'urgence.
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RobertArthur
329
Mar 2009
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