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The answer will depend on where in the world you live and the local adopted electrical code.

In the US, generally yes, 220V branch circuits are legal. Most electric ranges, electric water heaters and house air conditioning units require 220 (actually nominal 240) volts, and are fed from a branch circuit.

There are limitations and exceptions. For instance, the NEC ( 210.6(A) ) limits the following branch circuits to 120 volts nominal:

In dwelling units, guest rooms or guest suites of hotels, motels and similar occupancies, the voltage shall not exceed 120 volts, nominal, between conductors that supply the terminals of the following: 1. Luminaires (lighting fixtures) 2. cord-and-plug connected loads 1440 volt-amperes, nominal, or less or less than 1/4hp.

NEC (2005) article 210.6 covers branch circuit voltage limitations.

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