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March 5th 05, 01:08 PM

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2) Do modern refrigerators in apartments use ordinary AC sockets or
3-phase?

It would be an unusual residential apartment which has 3-phase AC
service of any kind directly incoming to the individual apartment.
Large apartment buildings and complexes may indeed have 3-phase service
from the power company, but the electricity would go through
distribution transformers in the building before it ever gets to your
apartment. 3-phase AC from the enduser point-of-view is used primarily
in large commercial and industrial applications for things such as
machinery, elevators, high-power transmitters, HVAC, etc.

Your apartment itself is almost certainly fed some sort of 208 VAC (or
thereabouts) single-phase 3-wire service where there are 2 "hot" wires
and a neutral. The higher voltage for electric ranges, etc. is taken
between the two hot conductors while 110 VAC for everything else (such
as the refrigerator) is 'derived' off of either one of the hots against
the neutral and would be wired to appear on the 2 parallel prongs of an
"ordinary" AC wall socket. [I'm presuming you live in North America
where we have 110 VAC devices, as opposed to Europe or other overseas
locations]

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