Morning guys and girls.
Generator questions.
I have a client who owns 2 warehouses (side by side) in a business park – each with their own supply from the LV room.
The 1st warehouse has 25mm 3 phase 100-amp supply.
The 2nd warehouse has a 3 phase 2x25mm SWA parallel supply going to a generator and from the generator its 70mm SWA to the warehouse
The generator is 250Kva.
What the client wants to do is supply the 1st warehouse (the one without the generator) from the 2nd warehouse (which has generator back up) when the power goes off.
I was thinking of running a 16mm (to give them 63 amps) from the 2nd DB (the generator one) to a manual change over switch by the 1st DB.
I figure if the power goes out (as it often does) the generator will supply DB 2 as normal and then I can run a 16mm to a manual change over at DB 1.
The manual change over means it won’t be possible to run on normal supply (from the LV room when the power goes back on) and the generator (from DB 2) at the same time.
Because there are 3 supplies involved (Supply to DB 1, supply to DB 2 and potentially a supply from DB 2 to DB 1 via a manual change over) its making me overthink it.
Rough sketch added – dotted line being the new 16mm running to a change over switch at DB 1.
Capacity isn’t a problem. The 250kva is way oversized for one or both warehouse.
Its just lights, small office’s and few machines. Highest readings at DB 2 are around 30-40 amps per phase. Ware house 1 is literally just lights and one small office
Can anyone see a problem with that? Running a supply from the generator backed up DB to the 1st ware house?
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