What size R90 copper conductors should be used for a residential 20 A circuit and 200 A service respectively? Please state the Code Rule. What length of conductor shall be left at each outlet for making joints or connection of electrical equipment? Please state the Code Rule. How must electric clothes dryers in a dwelling unit be connected? Please state the Code Rule. What type of (5-15R and 5-20R0 receptacle must be installed within 1.5 m of sinks, washbasins, bathtubs, shower stalls or outdoor within 2.5 m above finished grade? Please state the Code Rule. Draw a 14-50R receptacle and label the terminals.