A two phase furnace includes 2 types of heat. Usually it is composed of an electric heat pump and also a nat. gas/ propane heat source when the temperature drops below a set range. The reason they use these is because heat pumps are very efficient when there's not a large temperature change required, but they're efficiency drops dramatically when the outside temperature (or ground temperature) drops below freezing.
The only other two-phase furnace would be a two-phase electric (as opposed to a three-phase electrical furnace.) But I don't think you're asking about 2 vs 3 phase electrical furnace systems... Those are quite rare.
There is no such thing as a two phase instrument. There is only single phase and three phase. You can only have: single phase/ one pole single phase/ two pole three phase/ three pole
In a two-phase connection, the phases are displaced by 90 degrees. Two lines (not 'phases') of a three-phase system will provide a single-phase supply, not a two-phase supply.
From one phase to the next you should see 208 Volts.From any phase to ground you should see 121 Volts.AnswerYou are very unlikely to come across a two-phase machine, as two-phase a.c. systems are archaic. A two-phase system has two phase voltages that are 90 degrees out of phase with each other, and was used many years' ago. These days, you have either single phase or three phase. So it's probably safe to say that there are no two-phase motors about, these days!
Most electrical equipment are either designed to work on Single phase (two wires) or Three Phase (three or four wires). Two phase equipment are non existent today. A single phase heater will require a single phase thermostat while a three phase heater will require a three phase thermostat.
A two-phase* system is archaic, and has been completely superceded by three-phase systems, so there is no demand for two-phase induction motors. (*A two-phase generator has two phase windings, displaced from each other by 90 degrees.)
In two phase locking there are two phases. The first phase is known as Expanding Phase and locks are issued in this phase. No lock is released. Then after change all changes are committed and the second phase starts that is the Shrinking Phase in which all the changes are noted and the locks are released. No locks are issued in this phase
It's unlikely you have a two-phase supply. Two-phase systems (two phases, displaced by 90 electrical degrees) are very old, and there are very few two-phase systems around. Assuming you really mean 'two phase', t's unlikely, therefore, that you can use a three-phase energy meter using its standard terminals.
If you have single phase now, you have two options. One, is to install a three phase service or Two, install a roto phase device.
If two phase voltages are the same voltage and the same phase angle, the the resultant voltage will be twice the voltage.
it is the relative velocity of two phase that is gas and liquid.
initial phase follow on phase
Initial phase and follow-on phase