Well said mate. Safety first, electricity off, no need to risk your like getting shocked.
Even the open door theory on most dmds to interrupt mains power n high voltage doesnt work if the door button is faulty/been hacked.
I watched my brother screech when he put his arm against a under side of a next gen p/field when the door switch hadnt worked properly. 
He has never said whats that thing do again.lol