With this type of cable the sole concern is mechanical damage though. The main fear is that non-bonded steel like studs or wire lath could be energised by a damaged cable. It's really only designed to be embedded in plaster on a brick, block or concrete wall or ceiling. I'd say the outer sheat is maybe half the thickness of comparable cables or even less and it's rubber, a type of rubber that doesn't have all that much tensile strength and cuts easily. I've seen rolls of that wire on a store shelf that I wouldn't have used any more because the sheath looked so badly chafed!
This picture should give you an idea what I'm talking about:
http://cdn-reichelt.de/bilder/web/artikel_ws/C600/NYIFJ315.jpgIn new construction the cable is either nailed or glued to the rough walls before plastering.
https://upload.wikimedia.org/wikipedia/commons/7/7f/Stegleitung.jpg
