Most prolonged distance power lines don’t use insulation round the conductors on their own. Insulating in this manner would have to be so thick that it wouldn’t be cost efficient. As a substitute, the vast majority of insulation originates from air gaps, or just spacing every thing significantly sufficient apart. https://jeffreyglljh.theisblog.com/30088690/the-fact-about-wireless-speakers-that-no-one-is-suggesting