"In the Queens power outage thread, it was explained that the NYC grid is designed exactly like gfretwell described, with the secondaries tied together, with no means of disconnect in between.
It was mentioned (forgot where or by who) that Con Ed (NYC's POCO) has fuses inserted at various points thruout the tied together seconaries, so that if only one of many transformers is receiving power from the primary, that these linking fuses would open so that one transformer doesn't try to supply the entire neighborhood. Presumidly the linemen could pull those fuses to split up the secondary network when they need to fix something.
Though that TV news footage of secondary overhead feeds literally burning up seems to indicate that they didn't fuse that particular neighborhood. ?
