Determining Wire Cross-Section Between Switchgear Elements: Disconnector, RCD, Circuit Breaker

Question

Hello
What cross-section should the bridge have between the elements of the switchgear?

E.g. 5x4 mm2 is connected to the disconnector
1) the bridge between the disconnector and the RCD should be 4 mm2 (1 phase)
2) not less than 4 mm2
3) larger than 4 mm2

Should the same cross-section be continued between the RCD and the miniature circuit breaker or should the cross-section of the conductor of the circuit protected by the miniature circuit breaker be present?

elpapiotr · Accepted Answer

The bridges should have a cross section of 4 mm?

kokapetyl · Answer

This disconnector is probably not five-pole? From the disconnector, the circuits diverge in several directions, there you must use cross-sections in accordance with the load on the given line.

Anonymous · Answer

The cross section should not be reduced to the terminals where the receiving circuit is connected.
The fact that a bulb is connected there, for example, with a 1.5-wire cable does not mean that in a while there will be no change to e.g. an induction furnace - the cross-section is much larger :-)

piotrkartuz · Answer

The disconnector is 3-pole (PE and N are not disconnected), my question is about phase conductors.

kokapetyl · Answer

Did you encounter such a situation that an induction stove is connected to the lighting? The system disconnects from the disconnector over several circuits and here you need to maintain the appropriate cross-section of the cable depending on the load. And so, for lighting 1.5 mm?, for 2.5mm? sockets and for special receivers, a separate power cord also minimum 2.5mm?.

Anonymous · Answer

Where did the author write that it was a lighting switchboard? I meant justifying not reducing the cross-section of the wires. Regardless, the cross-section should be the same up to the exit.

piotrkartuz · Answer

The reason for my question is the use of bridges with a larger cross-section than 4mm2 (i.e. with a cross-section larger than the cross-section of the cable before RCD).
I was wondering if there could be any problems with "over-dimensioning".

elpapiotr · Answer

And what problems can these be? Too heavy distribution or what?

Anonymous · Answer

With such oversize it will work and nothing will happen. But why bridge the cross section? Well, unless you have an excess of e.g. 25 square

kokapetyl · Answer

Does it mean how WLZ is 10mm?. is it supposed to be this way?

xury · Answer

And no one thought that these bridges are dedicated combs usually 10-12mm2?

retrofood · Answer

For what? After that the bridge can be bought ready. The standard comb is also a bridge.

Anonymous · Answer

There is no question of WLZ. With the rest of the 10 square for WLZ? It's rather for a tiny switchboard If a colleague reads it more accurately, we are talking about unbundling receipts. Added after 1 [minutes]: OKAY. That's right I didn't think about those ready

retrofood · Answer

The principle is to install the protection in a place where the cable cross-section is reduced.

kokapetyl · Answer

And what comes to the disconnector (I mean the cross-section of the wire), because earlier there is an energy meter. We switch from the disconnector into (some circuits) and there does not have to be the same cross-section as at the entrance. ! 0 mm?, for 5x X for a flat is enough

piotrkartuz · Answer

Ok, thanks to everyone for the answer. I was wondering if RCD bridging with 4 S using different cross-sections is dictated by something? The other two RCDs are connected by a 12mm2 comb.

elpapiotr · Answer

The question is how it's done. Through the distribution block, double wire sleeves or else?

piotrkartuz · Answer

lines in double sleeves, judging by the thickness of the lines, the cross-section is different

[Solved] Determining Wire Cross-Section Between Switchgear Elements: Disconnector, RCD, Circuit Breaker

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