On Sun, 8 Sep 2019 19:12:25 -0400, Ralph Mowery
wrote:

In article ,
says...

Do you have single-phase or two-phase electric service?
No such thing as 2 phase



There is (was). What is split phase in most of the US is mistakenly
called 2 phase by some. However there really is 2 phase.
I hop ewe don't have to go through the same old 400 postings about this.


They were 25 Hz too. Wasn't aware there were any"shaker" transformers
still left in use. Noisy as heck - particularly the old Niagara 25hz
stuff. Transformers heated up from the friction of the laminations
rubbing against each other if they were not oil filled.

Two-phase electrical power was an early 20th-century polyphase
alternating current electric power distribution system. Two circuits
were used, with voltage phases differing by one-quarter of a cycle, 90°.
Usually circuits used four wires, two for each phase. Less frequently,
three wires were used, with a common wire with a larger-diameter
conductor. Some early two-phase generators had two complete rotor and
field assemblies, with windings physically offset to provide two-phase
power. The generators at Niagara Falls installed in 1895 were the
largest generators in the world at that time and were two-phase
machines. Three-phase systems eventually replaced the original two-phase
power systems for power transmission and utilization. There remain few
two-phase distribution systems, with examples in Philadelphia,
Pennsylvania; many buildings in Center City are permanently wired for
two-phase[2] and Hartford, Connecticut.[3]

No real reason the
permanently wired" 2 phase buildings cannot be connected to
"split phase" 120/240 supply. Be a bugger sourcing motors - things
like AC unis, driers, etc for an EXTREMELY limitted market.
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