Enclosed or permanent structures providing public utility services including the following uses, electric substations, transformers, switches and auxiliary distribution equipment, water pumping and distribution stations and similar stations and equipment, located in any residential zoning districts shall be subject to the following regulations:

Open, unenclosed uses shall be limited to the erection, construction, alteration or maintenance, by public utilities or municipal, state or other governmental agencies, of underground or overhead electrical, gas, water transmission or distribution systems or collection, communication, supply or disposal systems. Such systems may include poles, wires, mains, conduits, drains, sewers, pipes, cables, alarms, signals, hydrants and other similar equipment and auxiliary supplies in connection therewith reasonably necessary for the delivery and supply of adequate services by such public utilities and governmental agencies. No buildings are permitted.