An enhanced parking meter system utilizing user identification technology to achieve improved efficiencies in the enforcement and regulation of parking meters. The enclosure has a wall with an opening, and a cup member is attached to the wall at the opening. A molding material is disposed in the gap and encircling the supporting material. A removable insert which fits into an opening in the electrode through which gas flows. The shoe includes an upper having a slit opening separating an upper paneling and a lower paneling. The structures for heating trenches according to the present teachings reduce the power dissipation in power lines in an MCC and facilitate drying of trench walls during bubble formation.