Transformers only block DC. Unless your house is wired for that (pretty rare in almost every country) You'll backfeed AC which will go through transformers.
In fact it's likely the transformer on the street between your house and the network that's responsible for the death of the linemen. IIRC that's a step down transformer (so step up when run backwards like this.)
In fact it's likely the transformer on the street between your house and the network that's responsible for the death of the linemen. IIRC that's a step down transformer (so step up when run backwards like this.)