10mm2 or 16mm2 in a single phase 60A DB Board

[PierreJ]

@Fuenkli

the manufacturer of the RCD and Change Over Switch does not permit 2 16mm2 cables to be inserted in the termination points

The CBi earth leakage is rated for 35mm2 wire:

Whereas the Hager SF263 is rated for 25mm2 wire:

The datasheets specify the maximum wire size, but they do not explicitly say you cannot insert two of a smaller size. I would like to know where he got that information. The clamps of both these open wide enough so that you can easily stack 2 x 16mm2 wires on top of each other.

Here’s 2 x 16mm2 in the Hager SF263:

[Fuenkli]

@plonkster

Can you maybe on the photo show the offending wires?

i am not good at marking up photos but i can easily explain. All black neutral wires except the 2 ones coming from the inverter (inverter grid and inverter back up which are protected by 50A CB’s) are offending because they are only protected by the 60A main switch. They are all 10mm2. All the red wires are ok they are all 16mm2 (except the 2 coming from the inverter grid and inverter back up (only 10mm2 but protected by 50A CB’s) and the top RCD which is also only 10mm2, because i ran out of 16mm2 when i prepared the board for the new install and instructed the installer to upgrade to 16mm2. Until this is done this wire is also offending)
There is still a mistake with the wire protection of the alternative power supply (UPS) indicator light. the wires must be changed to 10mm2 because they are only protected with a 50A CB (but that is another story and does not need to be debated in the thread)

[Fuenkli]

@plonkster

Tell him you want at least from the main breaker, and the RCD to the busbars (neutral and live) to be 16mm^2. That’s only a little bit of wiring.

Good idea. Thanks for the tip

[PierreJ]

@Fuenkli

There is still a mistake with the wire protection of the alternative power supply (UPS) indicator light. the wires must be changed to 10mm2 because they are only protected with a 50A CB

You could also just use a small inline fuse, like this:

10mm2 wire might not fit in the indicator clamps.

[Fuenkli]

@PierreJ

You could also just use a small inline fuse, like this:

nice . Much easier, than to try to squeeze a 10mm2 wire into a Hager indicator/pilot light. Thinking about this i thought about the redundancy requirement for indicator lights. If for example the little fuse blows or the indicator light breaks, then there is no longer any visual indication, that there is an alternate power supply to the DB board. Is this ok?

[PierreJ]

@Fuenkli

If for example the little fuse blows

If you size the fuse for the wire and not the operating current of the LED indicator this is extremely unlikely to happen.

the indicator light breaks, then there is no longer any visual indication, that there is an alternate power supply to the DB board. Is this ok?

You could add a second indicator light to indicate that the first indicator light is working

But seriously, if the light is dead but the power is on then it is fairly obvious that it has failed and needs to be replaced.

[Fuenkli]

@PierreJ

But seriously, if the light is dead but the power is on then it is fairly obvious that it has failed and needs to be replaced.

But you might be dead