Flex conduit type wiring is normally considered safe if routed properly but in many areas will not meet code expect for short runs. May areas allow a 3 foot wipe of it to be used generally to hook up stationary appliances. Such as garbage disposals, dishwashers, exhaust hoods. This allows an alliance to be hard-wired (not just plugged in) and still able to be pulled out for service, also allows for slight flexibility. My opinion if the run is wired correctly and proper use of size was used it should be safe. But to address your question, It may not meet your local codes. Every area can be different so I can't really answer that type of question. A local electrician should be able to. Just a note some areas do not even require the use of metal conduit they allow for plastic sheathed cabling.