danger electric-power electricity electricity-poles electricity-power-lines energy equipment height high high-voltage high-voltage-equipment insulators light power power-poles power-supply strength sub-station supply transformers wires wiring advice advising alert attached bolted communicating communication concern cracked cracks electricity-supply information informing metal raised red safety security shadows sign signage symbol symbolic voltage volts warning warning-sign white wording current dangerous distribution electric electrical facility grid insulator station sundtech cables demand infrastructure pole clouds electric grid electricity grid electricity pole landscape meadow poles power grid power transportation sky support tower utility black communicate overhead power-lines protect protection risk risks risky yellow access-denied access-limitations appropriate-behavior appropriate-behaviour authorise authorised authority building denied exceptions limitations limited limited-entry not-allowed not-permitted prohibited prohibition regulations responsible restricted restrictions