Load calculations on three phase board

[westward10]

Using 63A mcbs is a bad idea as others have said you will not achieve selectivity. Any fault in a dwelling may well disconnect at the main board you need to insist on a Ryfield.

 

[Khanzada]

Using 63A mcbs is a bad idea as others have said you will not achieve selectivity. Any fault in a dwelling may well disconnect at the main board you need to insist on a Ryfield.

If I change MCB to RCBO that will be ok ?

 

[westward10]

If I change MCB to RCBO that will be ok ?

That will make it worse. Do the circuits need additional rcd protection. Is there any design spec for the job it can't be an ad hoc design and from what you are saying it is outside your comfort zone.

 

[Khanzada]

That will make it worse. Do the circuits need additional rcd protection. Is there any design spec for the job it can't be an ad hoc design and from what you are saying it is outside your comfort zone.

That will make it worse. Do the circuits need additional rcd protection. Is there any design spec for the job it can't be an ad hoc design and from what you are saying it is outside your comfort zone.

That will make it worse. Do the circuits need additional rcd protection. Is there any design spec for the job it can't be an ad hoc design and from what you are saying it is outside your comfort zone.

Thank you for your help and suggestion , Monday or Tuesday I will see the landlord and will update it .