Inspect This, Picture #3
Twelve gauge wires are currently being used on the 30-amp dryer circuit. This size wire is too small for the circuit. The circuit should have 10-gauge wires for service. There is also a white wire being used as an ungrounded (hot) conductor. At a minimum, this wire should be labeled with electrical tape at each end to identify it as a hot wire.
Comments are welcome edmartin1@juno.com