I am an electrical engineer working on a parking lot pole lighting design/installation whose poles are located about 90 feet horizontally away from the mid span of a horizontal arrangement of 230 KV 3 phase transmission lines. The poles are positioned outside of the easement for these HV lines. The HID flood lighting fixtures are specified to be mounted to bullhorn mounting brackets atop fiberglass poles 25 ft Above finished grade.
While trying to make the 208 volt single phase circuit splices in one lighting pole handhole the electrician was experiencing shocks. There were no circuit connections to the building power panelboard when he was experiencing the shocks. I am aware that there can be induced voltages in metal objects that are ungrounded in the vicinity of HV lines. Also I am aware that the electric fields can approach 2KV/m under the mid span of HV lines of the KV indicated above. High enough to illuminate a handheld 4 foot fluorescent tube.
Other than moving the poles further away from the lines, can placing the circuiting entirely in metal conduit (flexible) within the pole and(rigid metal) underground to the grade junction box as well as placing supplemental ground rods at the base of the poles to which the conduit and the equipment ground conductors are connected help attenuate the electric field on the circuiting? If the electric field can be shielded will the ballasts still function properly?
While trying to make the 208 volt single phase circuit splices in one lighting pole handhole the electrician was experiencing shocks. There were no circuit connections to the building power panelboard when he was experiencing the shocks. I am aware that there can be induced voltages in metal objects that are ungrounded in the vicinity of HV lines. Also I am aware that the electric fields can approach 2KV/m under the mid span of HV lines of the KV indicated above. High enough to illuminate a handheld 4 foot fluorescent tube.
Other than moving the poles further away from the lines, can placing the circuiting entirely in metal conduit (flexible) within the pole and(rigid metal) underground to the grade junction box as well as placing supplemental ground rods at the base of the poles to which the conduit and the equipment ground conductors are connected help attenuate the electric field on the circuiting? If the electric field can be shielded will the ballasts still function properly?