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#125003 01/25/07 09:56 AM
Joined: Aug 2001
Posts: 7,520
pauluk Offline OP
From Texas Ranger:

A few days ago I found this weird 3ph socket that had been sitting around in a box for about a year and decided to snap a few pictures.

Originally I found it in a house soon to be demolished that originally belonged to an architect and General Contractor. The room I found it in must have been some mixture of work shop and storage, I don't have the slightest idea what exactly they were doing there.

It is only 3ph+earth, 16A 380V, wired with 1.5mm2, and you can see how tight the connections were ;-)

The casing is made of die-cast aluminum I guess and it seems to be made in Austria since the only marking (aside of a brand logo I don't recognise) is ÖVE Austria.

I have NEVER seen anything like that!

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Joined: Dec 2005
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It looks like that the 3 phases are Blue and The Neutral or Earth is Red.
That Red wire doesn't look it is well secured or poorly stripped off.

In The Netherlands pre 1977, we had Red as Neutral colour, so it was probably the old European colour coding for Neutral.

Although on single phase supplies the phase colour was Green and the Earth wire was Grey pre 1977.

The product of rotation, excitation and flux produces electricty.
Joined: Aug 2001
Posts: 7,520
pauluk Offline OP
In The Netherlands pre 1977, we had Red as Neutral colour, so it was probably the old European colour coding for Neutral.

Red was the old color for earth/ground in Austria, Germany, and a few other places. It seems that all sorts of different systems were in use across Europe, in some cases multiple systems within the same country.

There's a thread in the reference area in which we collected together some postings about this:

International color codes

The three blue phases is interesting though. I'm sure Ragnar will correct me if I'm wrong, but for single-phase I understood that the old Austrian system followed the German, i.e. red=ground, black=hot, gray=neutral. So I would have expected at least one phase in a 3-ph system to be black.

The purple sheath is quite unusual as well.

One other point regarding the construction of that connector: Is there any sort of link between the earth pin and the casing when it's all assembled?

[This message has been edited by pauluk (edited 01-26-2007).]

Joined: Dec 2001
Posts: 2,498
The ground wire was so poorly screwed in it came out at the first tug.
In theory Austria followed the German color coding, but in fact conduit installs used whatever color was handy for phases (and often neutrals too). It isn't all that unusual either to find the circuits color coded, i.e. one circuit hot and neutral blue, the next both wires black, the third white, the fourth yellow and the fifth purple. So the three blue phases don't really surprise me - theoretically blue was the color of the second or third phase depending on the type of cable used (4w had the order black-grey-blue-red and 5 wire had black - blue - black - grey - red).

That sheath was just some purple tubing that extended from the socket into the conduit and must have been quite common back then (also came in various colors). That stuff was for example also used where sockets were installed in a panel to protect the conduit wire running from the Diazed fuses to the socket.

In one apartment I also saw a strange setup where a switch would select between either washing machine or dishwasher and the conduit wire to the dishwasher entered said switch in similar tubing.

The guts are held to the casing with a long screw and I suspect it goes directly into the earth connector. You can see that brass screw in the second picture.

I also posted these pictures on a German board and no one has ever seen anything like this.

In some ways it really looks like a predecessor of today's CEE plugs. The "typical" 3ph plugs back then were either 3 pins in a row and scrapers for earth and neutral (or just earth) or 4 pins in a row for 3ph and earth (pretty dangerous since the pin layout was symmetric and some of them could be assembled 180 degrees turned... so the ground and grounded plug casing became hot...). Though there were other systems that had one pin offset to prevent this... or another system with 5 pins in 2 rows... and all these contraptions existed in various sizes.

For example, the one with 4 pins in a row exists in 15A, 25A, 40A and 63A versions. The 25A version was pretty common in rural locations, as was the 3 pin + scraper. At some point the whole caboodle got outlawed since they wanted to phase out any metal plugs and sockets.

The GDR circumvented that intention by producing aluminium CEE plugs and sockets... and some of those still exist. On the other hand, many of the older metal plugs are still around too.

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