"Pete C." fired this volley in news:4dc7d33d$0
:

If your transformers are large enough to handle the single phase load
see single phase diagram A and you'll need only one transformer.

As an example, I run three 450 Watt Metal Halide high-bay lamps in my
barn. They were surplus, thus inexpensive, but designed to run from
208V.

I purchased a "0.25KVA" (250-"watt") buck-boost transformer that has a
240V primary, and a 32V secondary. The secondary is rated at just a
little under 8 amps at full load.

The three 450 Watt fixtures draw 6.5A total at 208V. So the 250 VA
rating of the transformer is sufficient. ('been running them every night
for 12 years off that same little grey box)

LLoyd