"Essential service" means the erection, construction, alteration or maintenance by public utilities or municipal departments or commissions of underground or overhead gas, electrical, steam or water transmission or distribution systems, collection, communication, supply or disposal systems, including poles, wires, mains, drains, sewers, pipes, conduits, cables, fire alarm boxes, police call boxes, traffic signals, hydrants and other similar equipment and accessories in connection therewith, including buildings reasonably necessary for the furnishing of adequate service by such public utilities or municipal departments or commissions or for the public health or safety or general welfare.
(Prior code § 30-700(35))