Hi Arend,
Welcome to ECN, and many thanks for the photos.
A few things jump out as seeming quite unusual, as seen from a British perspective.
First, the ground rod actually being driven from
inside the house looks very strange. We would normally locate the rod (if used) immediately outside a convenient wall. How long are your ground rods, by the way? It looks as though a fair length of it is not actually in the ground.
Your method of connecting the ground rod to the bar in the distribution panel also looks very odd, as does the section of conductor which zig-zags across the board between two sections of conduit.
There no reason why double-pole breakers (opening neutral as well) cannot be used here, but to do so would be very unusual.
A single-phase 25A service in a modern home is unheard of here. There are a few old 40A services still in use, and I even came across an old 30A service a couple of years ago, but 60 to 100A is the norm for domestic services, with main cables of at least 16 sq. mm. The use of 3-phase with such small service conductors as 4 or 6 sq. mm seems very odd, although similar to many other European countries.
I can see that you have a dedicated branch circuit for a washing machine. I'm guessing that "vaatwassar" is a water heater, but what else is that on circuit #4? Is #5 a dedicated outlet for a microwave oven?
On the color-code issue, here's a link to the long discussion we had about this some time ago:
https://www.electrical-contractor.net/ubb/Forum9/HTML/000081.html [This message has been edited by pauluk (edited 05-13-2004).]
