thread237-405800: Connecting Generator in Double Delta. I'm in a similar situation with a small Stamford unit bought 2nd hand by a client with no manuals or a maker's name plate showing model number, etc; supposedly about 12KVA, 240VAC, 1Ph, 50Hz and because I could see the single red, black and green cables coming from the terminal box (they'd been cut about 500mm outside the box) I never thought anything of it until I came to wire it up and took the terminal box cover off - it's a 12 wire, 3ph unit wired in double delta to provide a "single phase" supply. It does indeed produce 240VAC and I ran it into a 1.5Kw resistive load to prove that it does work but I have to wire it for an MEN system (neutral and earth connected). During the test run I tested between "neutral" (being the original black wire) and "active" (being the original red wire) to "earth" (being the generator frame) and got about 70VAC N - E and about 170VAC A - E. Seemingly a winding end is connected to the generator frame somewhere but it isn't either of the ones providing the 240VAC as originally wired; does anyone know if this type of generator can even be configured to produce 240VAC for an MEN distribution system?
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