electrical wiring query

[Gyn_Paul]

I'm running electricity up into the grenier for sockets, and lighting and where there is also a chauffeau.

So up the trunking should go : -

P, N, and E in 1.5mm for the lighting circuit from a 10A disjoncteur,

P, N, and E in 2.5mm for the power circuit from a 20A disjoncteur

P, N, and E in 2.5mm for the chauffeau from a 20A disjoncteur (from a J/N switcher powered by its own 2A disjoncteur)

When the trunking arrives in the grenier, the first thing it reaches is the chauffeau, then it runs on to the sockets.

I think I know the answer to this but I'll ask the question anyway....

In this case - where there is a duplication of earth wires - do I have

to have a dedicated earth for the chauffeau, or can it share the one

for the sockets?

p

[fulcrum]

Gyn_Paul

I note that the disjuncteur for lighting in France is either a 10amp fusible type or a 16amp resettable trip.

With regard to earthing. There should be a separate earth for each separate circuit. Seeing as the cheaffe eau HAS to have it's own circuit and disjuncteur then it also has to have its own separate earth.

The above I have gleaned from the L'Installation Electrique.

[Deimos]

I believe the wire sizes depend on the length of run. I recently ran some supplies to an attic and had to use 6mm for sockets (4mm would have done but the shop only had 6mm) and also 2.5 mm for the lights.

Ian

[Gyn_Paul]

It's about 20m to the chauffeau, and 25m to the sockets. Lighting

perhaps a bit less. Can't imagine the losses would be too bad for those

lengths. The sockets circuit is never going to carry more than a couple

of table lamps, a PC and a keyboard or two. The chauffeau is 2200W,

that's... let me see... 9.56A? Well within spec.

p

[Gluestick]

Useful URL on cable selection, loss over distance etc.

Go to bottom. UK based data thus not directly usable in France, however resistance etc tables useful.

http://www.kevinboone.com/cableselection_web.html

 

[Deimos]

For the French stuff check on http://www.repereelec.com/index.php?page=edc (somebody else here gave me the link recently when I was planning my stuff.

The distance/power table is midway down the page.

I thought the power was dependent on e.g. sockets or lights rather than what you would connect to those sockets. Thus, somebody might come along after you and add a few more sockets (subject to the max limit of 8) and thus the cable specs should be appropriate for this. What I am saying (badly) is that whilst you might only be using a few table lamps the installation should still conform to the norms (somebody else might plug in something consuming a bit more power).

However, I'm not a professional nor expert.

Ian

[Gyn_Paul]

[quote user="Deimos"]

For the French stuff check on http://www.repereelec.com/index.php?page=edc (somebody else here gave me the link recently when I was planning my stuff.

The distance/power table is midway down the page.

I thought the power was dependent on

e.g. sockets or lights rather than what you would connect to those

sockets. Thus, somebody might come along after you and add a few more

sockets (subject to the max limit of 8) and thus the cable specs should

be appropriate for this. What I am saying (badly) is that whilst you

might only be using a few table lamps the installation should still

conform to the norms (somebody else might plug in something consuming a

bit more power).

However, I'm not a professional nor expert.

Ian

[/quote]

thank you Ian, that's a very useful chart. the only thing I would take

isssue with is the size of the wire for 'pilots etc' : on both the last

occasions when I've had EDF change a meter from ordinary to HP/HC,

they've wired the pilot connection from the meter in black 1mm rather

than the advised 1.5mm.

p

[Chancer]

The disjoncteur feeding the aservissement current through the HP/HC relay has to be 2 ampere to conform with the norms, that would allow a tremendously long run on 1,5mm2 cable.

I will use 1mm2 as well next time as it will be run in a gaine and I will be able to change it should the inspector insist on it, although I am sure that he will understand and agree if he is like the last one that I had.