HADJI APPLIANCES

Hello Martin,

There should be no trouble, as stated above, providing the load was balanced fairly equally across all secondary windings.

However, all appliances using that 208 volt secondary should have a dual-pole switch, to properly isolate both legs of the supply.

My suggestion would be to earth that secondary neutral point, and also connect it with an extra wire to the metallic chassis or frame of each load appliance.

I don't know what your local arrangements are, and presume in the hot desert conditions, an earth stake would be of little use.

If your arrangements are more than immediately temporary, an earth mat under the appliances, bonded to the appliance chassis would also be useful to prevent stray shocks.

If you are in permanent buildings, and those have steel reinforced concrete or steel portal framing, bond all exposed metal, stainless steel bench-tops, appliance frames/chassis etc, to that star point.

In that way, the shock potential is minimised.

You could also use ELCB protection, but if your floor is desert sand, that is not going to work, at all.

Here in New Zealand, we use 400v 3 phase/230v single phase MEN (Multiple Earthed Neutral System), where every switchboard has connection to a local earth stake. NZ soils are fairly conductive, so that works fine here.

Please advise here further, your progress, thank you....