Practical applications of single phase and three phase ac supply with their operating voltage and other electrical parameter wikipedia
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In essence, most equipment is by nature single-phase, so end-point delivery of single-phase power is thus required. Virtually everything is manufactured assuming 110 VAC single phase.
That said, long-distance power transmission such as in urban areas cannot do this because of the inherent inefficincy, thus both kinds of equipment come into play.
Typically, in urban areas three-phase power is delivered where 110V is available from any of the three with respect to neutral [not to be confused with safety ground, which should be close but usually not quite identical]. Often, each building is provided two of the three to allow larger appliances to work based on 208 V or more.
In less and less areas, there is an older form of distribution past the really primitive single-phase service that is virtually non-existent these days, and that is two-phase distribution, which is merely single phase with a mandatory center-tap and the voltage thus twice as much end to end on the output winding. Thus, many people would refer to this as “220 volt” power and in some areas they may even be right. But others will be wrong because they are actually delivered somewhat less and nominally called 208 volts.
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In essence, most equipment is by nature single-phase, so end-point delivery of single-phase power is thus required. Virtually everything is manufactured assuming 110 VAC single phase.
That said, long-distance power transmission such as in urban areas cannot do this because of the inherent inefficincy, thus both kinds of equipment come into play.
Typically, in urban areas three-phase power is delivered where 110V is available from any of the three with respect to neutral [not to be confused with safety ground, which should be close but usually not quite identical]. Often, each building is provided two of the three to allow larger appliances to work based on 208 V or more.
In less and less areas, there is an older form of distribution past the really primitive single-phase service that is virtually non-existent these days, and that is two-phase distribution, which is merely single phase with a mandatory center-tap and the voltage thus twice as much end to end on the output winding. Thus, many people would refer to this as “220 volt” power and in some areas they may even be right. But others will be wrong because they are actually delivered somewhat less and nominally called 208 volts.
hope this answer helps you
please mark it as brainliest
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