The ground bus is a terminal block with many small holes where the bare ground (or green wire) can be connected and tightened into place with a screw. Also note that a 220 dual breaker has both breakers bridged so that one of the dual breakers will also trip the other side if it where to trip off.
If you ask you local building or electrical supply depot for a dual 30 amp breaker for use in a 220v dryer circuit for this model/make breaker panel, they will be able to pick out the correct breaker for you. The black connects to either the outside left connecting lug and the red connects to the other outside connecting lug. Appliance Aid 3 wire dryer power systems are for use with existing ungrounded dryer receptacles mainly in older homes whose wiring in years gone by was not grounded. 2500 State Road 44 Oshkosh WI 54904 Telephone: (920) / Fax: (920) m CGI Part. A ppliance Aid, a 4 wire dryer cord contains a black, red, white and green wire. Since in this case the neutral serves as a neutral and a ground connection, a jumper band (ground strap) is also connected to the center terminal and to the frame of the dryer. November 17, 2011 by, marlan at Rv52 25 Comments, handy Voltage Reference for 50 Amp Service. In the sample picture above the ground strap in folded over and is connected to the center connector but NO connection from it or jump to ground. All these connections are inside that 30 rated 4 prong dryer receptacle.