Where a single 125-volt, single-phase, 20-ampere receptacle outlet located in an attached garage of a dwelling unit is provided for a central vacuum assembly, the receptacle outlet is required to have _____.

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Most states require an electrician to pass an exam to receive a journeyman or master electrician license.  State exams cover these topics:  Electrical Theory, Trade Knowledge, Grounding and Bonding, Wiring Methods and Installation, Overcurrent Protection, Load Calculations, etc. 


Where a single 125-volt, single-phase, 20-ampere receptacle outlet located in an attached garage of a dwelling unit is provided for a central vacuum assembly, the receptacle outlet is required to have _____.