You will need approval if you intend to use a corrosion protection system. A corrosion protection system (CPS) is a system which applies an electrical current to a metallic (primary) structure to protect the structure from corrosion caused by its contact with soil or water and include:
- cathodic protection systems
- drainage bonds
- boosted drainage bonds
- cross bonds.
You will be required to use a corrosion protection system if you own an underground structure that needs protection from stray current, for example, electricity networks, railways, gas companies, petrol storage tanks, and ports.