A relatively large and dated commercial building has been sub-divided in to individual units. The original building had several DNO supplies some PME and some TT. It looks like the building may have originally been a cluster of separate buildings which are now all under the same roof. Each sub-divided unit has its own installation supplied from one of the original DNO sources. Whilst the wiring is separate they do share steel trunking and structural steel. One of the larger units which is TT is to be let to a company that will have a heavy IT dependence. Just thinking about the possibility of EMI due to the common connections. Any opinions?
Thanks Kelly. Supplies are not from the same transformer. I am sure that the situation exists in many buildings without detrimental effect. However, it would seem to me that this installation is not truly TT and small circulating currents in earthy items are inevitable and unpredictable. That is bound to happen in PME installations anyway although I am not sure if that in itself is an EMI concern.
for clarity I have no input in the design, I am just interested in any inherent concern.
Thanks Kelly. Supplies are not from the same transformer. I am sure that the situation exists in many buildings without detrimental effect. However, it would seem to me that this installation is not truly TT and small circulating currents in earthy items are inevitable and unpredictable. That is bound to happen in PME installations anyway although I am not sure if that in itself is an EMI concern.
for clarity I have no input in the design, I am just interested in any inherent concern.
