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If you have for example a supply cable neutral of 185mm, then the bonding to the steel works etc, needs to be in 50mm earth.
However, if this supply feeds another board in an adjacent room which has a seperate steel structure, but is part of the same building, would the bonding to that need to be based on the main supply or on the db based in that room?
However, if this supply feeds another board in an adjacent room which has a seperate steel structure, but is part of the same building, would the bonding to that need to be based on the main supply or on the db based in that room?