Can I split a 380 cable into 3 x 220
Thank you for your quick responce.
The exiting cable is from the powerboard to a central box on the wall and they used it for an electric heater.
I want to use that cable to make 3 wall outlets for a dryer, a washmachine and for light.
When I use that product I have to make extension cables to go to the wall outlets and I don't think it is allowed.
The exiting cable is from the powerboard to a central box on the wall and they used it for an electric heater.
I want to use that cable to make 3 wall outlets for a dryer, a washmachine and for light.
When I use that product I have to make extension cables to go to the wall outlets and I don't think it is allowed.
Hobbyelektriker
· Värmland, Molkom
· 27 004 inlägg
Short answer: yes.
You should use three separate single-phase cables from the junction box, one to each outlet.
Each cable carrying a live conductor from one of the incoming, and the common neutral and earth.
You should use three separate single-phase cables from the junction box, one to each outlet.
Each cable carrying a live conductor from one of the incoming, and the common neutral and earth.
I misunderstand something.
What do you mean by "yes" because you also write I "should use 3 separate single phase cables".
The existing cable is connected to 3 single fuses and to the common neutral and earth rail.
By the way it is a 5 x 2,5mm2 cable so not the common 1,5mm2 cable !
What do you mean by "yes" because you also write I "should use 3 separate single phase cables".
The existing cable is connected to 3 single fuses and to the common neutral and earth rail.
By the way it is a 5 x 2,5mm2 cable so not the common 1,5mm2 cable !
Hobbyelektriker
· Värmland, Molkom
· 27 004 inlägg
It's maybe my english. Yes, you have a 3-phase cable from the switch board to the junction box. I meant the cables from this junction box to the outlets. Those cables should the "single phase" to avoid some hairy questions about maintenance of the outlet etc. That is, one separate cable to each outlet so that each outlet only will have one phase on its terminals.
Your English is very well 
Now I understand, I can use the 3-phase cable and connect each wall outlet with a single phase cable in the junction box.
I called the junction box as central box.
So it is no problem to use one neutral wire from the switch board and split it to 3 wall outlets ?
That is what worries me.
Now I understand, I can use the 3-phase cable and connect each wall outlet with a single phase cable in the junction box.
I called the junction box as central box.
So it is no problem to use one neutral wire from the switch board and split it to 3 wall outlets ?
That is what worries me.
Yes, it's fine to share the neutral (and ground) among the different outlets. The reason why this works is due to the fact that each outlet is fed from separate phases. The sine-waveform of the current of each phase is offset 120 degrees to each other. Therefore the current going through the neutral wire will never exceed the current running through any single phase (they cancel out each other).
Depending on the type of load the above statement might be false, but this is only under very rare conditions. For almost all domestic use it will work perfect!
Depending on the type of load the above statement might be false, but this is only under very rare conditions. For almost all domestic use it will work perfect!