OP
nathansinar
The braid should be earthed as its intended use is primary a control cable and the braid is used as a shield for electromagnetic interference. VSDs can give off a lot of interference which interfere with metal detectors and other sensitive equipment. The braid can be earthed at one end or both for higher frequencies.
That said the cable is often used as a rough service cable and often used as you have. the problem is widespread (I have used it in the past)
The worst electric shock I have had was from this type of cable the braid was not earthed and used as a trailing cable on a farm. A dog yelped as it walked on a board off a pallet. So suspecting a nail in the wood I picked it up touching the damaged cable which was live. my feet and hands were wet and I felt it hard.
but you can get away with it thats all im saying im not saying its the best way by any means haha