DISCLAIMER: I am not in Canada. Nor am I a licensed Electrician.
It is my understanding that if there is potential to cause physical harm, then you need an E-Stop. Can this conveyor damage a finger if it gets caught in the conveyor? Is this in a Commercial or Industrial environment? Does it need safety guards? Is it interlocked with another piece of equipment?
If any of those questions are answered with a yes, I would suspect that the relay with Start/Stop and E-Stop switches is probably a good idea.