Supply to a 63A RCB

[Spike1947]

You describe no overcurrent protection at the supply, this would be best before it goes through the wall as otherwise you are relying on the DNO supply fuse which will not be suitable for a 6mm² cable.
The cable is running through a wall so is not in free air, there is a significant limitation to the heat loss.
You have a total maximum load of 84A from the sum of circuit breakers, though this is not the design current.
You are reading the wrong table for the the cable type.

Overall, no, 6mm² cable is unsuitable for this application. Depending on your supply fuse size 16mm² or 25mm² cable would be more appropriate.

It is not fed direct from the DNO fuse , this feed come via a 63A RCD 30mA from the DNO fuse box ! .

Well being as its a grain store you have now got to be very carefull with ip rating of everything in that vasinity,may be worth reading DSEAR. So after everybody telling you NO its not ok to use 6mm cable youve used it anyway?? Why dont you post a pic of the incoming 3phase set up and maybe we can give more accurate advice.

No not 6mm2 , I am using 10mm2 as I have just stated ! .

 

[Spike1947]

You describe no overcurrent protection at the supply, this would be best before it goes through the wall as otherwise you are relying on the DNO supply fuse which will not be suitable for a 6mm² cable.
The cable is running through a wall so is not in free air, there is a significant limitation to the heat loss.
You have a total maximum load of 84A from the sum of circuit breakers, though this is not the design current.
You are reading the wrong table for the the cable type.

Overall, no, 6mm² cable is unsuitable for this application. Depending on your supply fuse size 16mm² or 25mm² cable would be more appropriate.

It is not fed direct from the DNO fuse , this feed come via a 63A RCD 30mA from the DNO fuse box ! .

Well being as its a grain store you have now got to be very carefull with ip rating of everything in that vasinity,may be worth reading DSEAR. So after everybody telling you NO its not ok to use 6mm cable youve used it anyway?? Why dont you post a pic of the incoming 3phase set up and maybe we can give more accurate advice.

No not 6mm2 , I am using 10mm2 as I have just stated ! .

 

[Leesparkykent]

The 63A 30mA RCD does not provide over current protection! You don't understand the basics...The thread should be closed before you burn the place down or kill some one.

 

[westward10]

Can you not post a picture of the setup, your explanation may be at odds with what is actually in place.

 

[Tony Barnes]

Haha

 

[Risteard]

Also what is an 83A device? That's a new one on me!