Loren Coe wrote:

this is a small 1960 tract home, most likely _not_ a two phase power
feed, the voltages for the low side is normally about 123vac, it varies
but have never seen it as low as 115 but as hi as 127. i suppose that
is not very definitive, the date s/b, here in Dallas-Plano. i always
thought the low side of a 208 feed was 110v?

To be sure, measure the hot to hot on the putative 240V as well as
neutral to each hot. If the sum of the hots to neutral equals (or is
very close to) the hot-to-hot, then it ain't two phases of a three phase
system.

Ted