Utilities are generally required to ensure the delivered steady-state voltage is within the limits specified in ANSI C84.1. Persistent under- or over-voltage can result in customer complaints of frequent blown light bulbs, overheated motors, and equipment damage.
Generally speaking, ANSI C84.1 specifies limits of 5% above and 5% below the voltage nominal at the service entrance. For example, with a 120V nominal, these limits would be 126V and 114V, respectively.
Another standard of note is ITIC (formerly CBEMA) standard, intended to be a performance-oriented standard for electronics equipment manufacturers. ITIC specifies more lax limits of 10% above and below the nominal voltage in the case of steady-state voltages...
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