green screw provided. Photo used with permission from Jeff Worrall. A breaker can be installed without physically touching the bus lugs. Use a 30 amp 240 volt double pole breaker in the panel. Wiring a Dryer Receptacle Circuit. If you were to measure the voltage between a red lug and a black lug (they are not really those colors in the panel, just used here for explanation purposes), you would measure 220v, if you were to measure between a black bus lug and. But the electrician somehow gets the wiring wrong and connects 240-volts to their 30-amp RV outlet rather than 120-volts.
The red and black wires are hot live wires and get connected to the 2 outer connectors on the dryers power terminal block, doesn't matter which is which as long as it is the outer two connectors. If he or she doesnt seem to understand the difference, then you need to get a new electrician. Dryer cable between circuit panel and dryer plug is 10 AWG, black/red/ white/ bare. The center wire (neutral wire) of the cable goes to the center connector. The red and black wires from dryer cable connect to the dual 30 amp breaker, one to each of the dual breakers. The breaker used must be a dual (double) 30 amp 220v breaker. This picture above shows a dryer cord (at the dryer end) with 3 wires only, No ground wire. In the example in the picture the dryer doesn't have color designation on the wires, follow direction above; if the dryer cord does have colored wires, white is the neutral wire to the center connector, the red and black wires are the hot live wires. 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.