Jump to content
Complete France Forum

Sharing an earth spike


Gyn_Paul

Recommended Posts

The earth wire from my telephone junction box ambles through a doorway to the usual sort of installation which FT seem to think constitutes a good earth (a bit of galvanized pipe with the wire stuffed under some sort of U-clamp).

This is the doorway which I'm preping for a new front door. I've got to move the junction box a couple of centimeters anyway, and since my new extra-long earth spike for the second electricity tableau is close to hand, it seems logical to transfer the FT earth wire to that (probably a damn-sight lower resistance than the rusty pipe it's currently nearly attached to!).

I'm sure there's a regulation which forbids this, but I'm wondering if Punch (or anyone else who might care to hazard an opinion) can explain why....

p

Link to comment
Share on other sites

Is it even connected to anything ?

All you need is a single pair neither of which is, or should be, connected to ground.

Earth wires in telephone cables are a redundant and a legacy from the pulse dialling systems of yesteryear.

I have one coming into my house and it snakes across the pathway beside the house. When I asked the French lady from whom we bought about it she was at great pains to stress that it was vital and should be taken care of but in reality it was of course connected to nowt !

Link to comment
Share on other sites

The only earth entering and leaving the "barrette de terre" and main earth rod of an installation should be the main earthing cable for the electrical installation itself.

The telephone incoming "test" socket situated in the GTL of new installations has to be earthed with a minimum 4mm size earth wire to the tableau electrique main earth bar.

Older installations usually have a earth wire directly into the ground somewhere (as stated earlier in this thread)

I believe these earths are for lightning protection purposes.

 

www.punchardrenovation.com

 

Link to comment
Share on other sites

[quote user="Punch"]

The only earth entering and leaving the "barrette de terre" and main earth rod of an installation should be the main earthing cable for the electrical installation itself.

The telephone incoming "test" socket situated in the GTL of new installations has to be earthed with a minimum 4mm size earth wire to the tableau electrique main earth bar.

Older installations usually have a earth wire directly into the ground somewhere (as stated earlier in this thread)

I believe these earths are for lightning protection purposes.

 

www.punchardrenovation.com

 

[/quote]

Let me see if I've got this right:

If the phone line, junction box, cabling etc are separate, then it's interdit to connect its earth wire to the same spike as the electric tableau, because that would mean they are effectively sharing a path to earth.

Unless of course the telephone wiring (etc) and the phone test socket are co-sited with the electrical tableau (I'm assuming a GTL is that plastic extrusion below a pre-formed tableau-and-trunking setup which seems to cost more than the tableau and all the disjoncteur put together) in which case it's quite OK to connect it to the tableau's earth (and ultimately the same spike).

Aren't these two scenaria electrically the same?

Is this right ?

Is this French?

Is it any wonder I'm confused? [8-)]

As a sidebar I note that the sheds are still selling these things (I'll call them a GTL until someone puts me right) with the usual FT inverted 'T' socket. I understood that the norm from 1 jan 2008 was an RJ45 socket.

p

Link to comment
Share on other sites

My Consuel inspector asked me to connect the barrette de terre in the GTL (actually I used a tableau nu) to the one in the main tableau, which I did while he was there, he did not ask me to then connect it to the telephone master/test socket which in any case I dont think has an earth terminal.

Editted

It is permissable to connect more than one main earthing cable to an earth spike for a multiple installation, I will have in total 7 different metered supplies to apartments that will all share the same picqet de terre.

The consuel guy confirmed that this is OK and it of course cuts down on the testing, I think the rational is that it is highly unlikely that more than one installation will be carrying a fault current simultaneously given that each DD would trip within 30ms.

Link to comment
Share on other sites

Archived

This topic is now archived and is closed to further replies.

×
×
  • Create New...