Please help me understand cable markings

[Paul36x]

I do have one more question: Does it really matter how big the ground cable is? This a just a minimal discharge right? I saw it was half the size in the triple wired cables. How thick should it be minimally for 40amps?

 

[gutterball]

My room itself has a 40a main breaker with a 40a breaker for the shower and a 20a breaker for the sockets next to it. Outside of my room is a 50m cable running to a small room where all the apartments in the condomium have their own breakers and meter installed, this one is also a 40a breaker.

3x40a breakers? the breaker should get bigger the further upstream you get. ie 100a incomoming to meter 60a at consumer unit/fuse board then 40a,32a,16a etc for final circuits. this is so that a local fault won't take out the whole system.

 

[accordfire]

3x40a breakers? the breaker should get bigger the further upstream you get. ie 100a incomoming to meter 60a at consumer unit/fuse board then 40a,32a,16a etc for final circuits. this is so that a local fault won't take out the whole system.

Thailand, not Britain.

I think one day there is going to be a LOT of work out there.

 

[robd]

Sounds dodgy to me!

 

[pushrod]

I do have one more question: Does it really matter how big the ground cable is? This a just a minimal discharge right? I saw it was half the size in the triple wired cables. How thick should it be minimally for 40amps?

No. If you are talking about the main earth for the whole property. In the event of a live to earth fault you could have a massive current going thru it until the breaker disconnects. If that cable was too small and burnt out before the breaker did its job all the earthed metalwork would stay live.

If you are talking about a 2 core and earth wire - the earth size will have been designed to cope if it has been correctly selected in the first place.