Laying carport electrical wiring

moin

in 3 weeks our carport will finally arrive, after we had to wait forever for the paving. I am therefore currently planning our electrical installation in the carport.

Prepared by our electrician:

5x 2.5mm² cables secured with RCD and 16A in the fuse box in the house
5x 4mm² cables, secured through missing fuses in the house, pre-connected for 400 volt socket (electric car)

Both cable ends were already laid to the correct place in the shed of the carport during the paving work.

I will do the installation myself. As a graduate mechanical engineer with training in pipeline construction, I consider myself qualified enough to carry out such work. Because the entire line also has its own fuse, I can easily turn off the electricity for this job (+ test with a multimeter ...)

For the switch program I have chosen Busch Jäger Ocean in blue. IP 44 for covered outdoor areas. I will buy 1x 50 meters cable 5x2.5mm² so that I can connect everything. I wanted to use 5 cores because this way I can loop all 5 wires from the house everywhere (although only 3 are connected) and also only need 1 cable to switch e.g. lamps, while the socket at the switch permanently gets power. I wanted to set up 3 lamp circuits, 1x carport area, 1x shed and 1x covered terrace (table lighting). Each circuit should have at least 2-3 sockets. The carport lighting will have a two-way switch from 2 points and 1x motion sensor.

I wanted to run the cables through Ø20 electrical conduit (rigid conduit), fix the conduits to the carport with quick clamps (OBO Bettermann). I am not yet sure whether I can get the cable directly from the empty conduit into the socket line via an M20 cable gland or similar.

The 5x4mm² cable I will only lay to a distribution box. If I really need the cable, I will leave that to an electrician.

Questions:

- Does 5x 2.5 make sense or are 4 or even 3x 2.5 enough? 2.5mm² is required for 16A, right?!
- Is the Ø20 conduit sufficient or better 25 conduit? I thought the 1x 5-core cable would offer enough options (5x2.5mm² cable has a diameter of 13mm)
- Suggestions for improvement?

I thought you can handle that with your degree program

What do you want to do with a 4mm2 cable? Completely unnecessary and exaggerated...
For 16A sockets, 1.5 cables are sufficient.

I would take M25 and suggestions for improvement? Get someone who knows about it and help him - but if it already fails there and an internet forum is asked, then I would leave it.

Hello

he doesn't want the 5*4mm^2 for the 16 A but for the 32 A connection for the car. That makes sense...

Although, if there ever will be electric cars with usable ranges (>750 km) and charging times (<15 min), even the 32 A is just a drop in the bucket. Even the 32 A connection needs easily 10 hours to charge a 120 kWh battery. That really is the lower limit of what’s useful. Actually, you would need 400 V and 500-1000 amps. But that really is no longer for household use!

Back to the subject:

I will also lay it (have it laid). And depending on the cable lengths, it’s not entirely wrong to increase the cross-sections a bit; if there really is a socket after 50 m, with a tight cross-section and high power demand, it can lead to the current going up and the fuse constantly blowing. Such a situation annoyed me terribly back in my community service. When working with the high-pressure cleaner in the outdoor facilities, someone always had to hold the fuses because they wanted to trip every 2 minutes.

In short, I consider the 5*4 mm^2 and 5*2.5 mm^2 absolutely sensible.

The "thick cable" already has a diameter of easily 15 mm, so I might also take a 25 pipe.

Make sure that the pipe is approved for outdoor use, so it doesn’t crumble after three years due to UV radiation.

Best regards,

Andreas

For 32A, 2 cross-sections of 5 are planned, not 4...

Hi,

For 32A, 2.5mm² cross-sections are planned, not 4mm²...

nope, you may load 2.5mm² cross-sections with 20-25 A, no more.
for 4mm² cross-sections, it ends at 27-34 Amps. In other words, if things go really badly, strictly speaking you even need 6mm² for the 32 A socket...


Best regards,

Andreas

Dirt - you are, of course, right... Sorry!