Bonding between two buildings

[mechelec]

if the supply is TNS then it should not be a problem if you bond the the MET from each supply together. If it is TNCS then i would say no because if you lose the neutral to one incoming supply the current would find a path through all the bonded metalwork and could overload neutral earth conductors on the other supply

 

[Deleted member 9648]

if the supply is TNS then it should not be a problem if you bond the the MET from each supply together. If it is TNCS then i would say no because if you lose the neutral to one incoming supply the current would find a path through all the bonded metalwork and could overload neutral earth conductors on the other supply

Exactly why you should link the two MET's regardless of earthing system......if you dont the situation you describe would result in a dangerous PD between conductive parts in the same building.....The linking earthing conductor should be sized accordingly.
It's likely that in reality the two MET's will be linked via parallel paths through bonding and cpc's anyway.....better to provide a properly designed copper link in my view.....