For most residential electrical services, how many phases are typically used?

For most residential electrical services, two phases are typically used. This configuration often refers to the standard 240/120 volt service commonly found in homes. This type of service allows for the powering of larger appliances that require 240 volts, such as dryers and ovens, while still providing 120 volts for general household outlets and lighting.

In a two-phase system, the two "hot" wires are out of phase with each other, which provides the necessary voltage levels for a variety of household needs. This flexibility makes two-phase systems well-suited for residential use, where both higher and standard voltage is required.

Other configurations, such as single-phase or three-phase, are less common in residential settings. Single-phase power can often be suitable for very basic electrical needs but lacks the capacity for larger appliances. Three-phase power is typically reserved for industrial and commercial applications due to its efficiency in handling high loads but isn't usually necessary for the average home. In summary, the two-phase system provides the versatility and reliability that most residential settings require.