What you need to know What's involved? A visual inspection of all the accessories without removal. (Accessories mean sockets, switches, fused spurs, light fittings, etc). Accessories are checked for cracks and evidence of overheating A sample of accessories is removed, typically 10% so around 2 or 3 sockets. The sample may be increased if issues are found with the wiring of the removed accessory, for example, no green & yellow earth sleeve on the CPC (earth conductor) or no rubber grommet where the cable enters the back of a metal box. Earthing and Bonding. The electrical installation must be earthed, and incoming metallic mains service pipes, such as water and gas, must be bonded. Earthing is identified by a green & yellow conductor from the cut-out housing the main fuse if your DSO provides an earth, or it may be a green & yellow cable to an earth rod in the garden in many rural areas. Bonding is identified by a green & yellow cable from the DB (Distribution Board, consumer unit, fus