1. Treat the installation exactly like any other fixed appliance installation.
2. A licensed electrician should install.
3. You can use a 16A double pole to break the live and neutral.
4. Note that the disconnect must be within the 1.5m distance from the device or the switch must have a lock-out. (see SANS 10142-1 6.16.1.4)
5. Appropriate registration for an Small Scale Embedded System might need to be done with your local municipality. And the municipality might require a Pro/Eng to sign off, etc.