The Code covers the installation of what for public and private premises?

The Code encompasses a wide range of installations for both public and private premises, which is why the answer is all-encompassing with "All of these." It includes electrical systems, communication systems, and data transmission systems, ensuring that all aspects of the infrastructure are regulated for safety and performance.

This broad coverage ensures that all types of systems are installed according to specific safety standards and operational guidelines, reflecting the interconnectivity of modern technology. By having a uniform code that addresses multiple systems, it allows for a cohesive approach to safety and efficiency in the installation and maintenance of these vital components in various premises.