This is where 70% of all faults are determined, damaged plugs, nicks in wire, bare wire core, scald marks, broken switched and casing. These are the main signs that an engineer is looking for. Once an appliance has been visually inspected it can be readied for electrical testing only is suitable (passed visual)
Class 1 Appliance (earth present)
There are 2 test which need to be carried out here, Earth Bond Continuity and Insulation. Earth Bond will ascertain whether the Earth connection from plug to appliance still has its full integrity. Insulation test will run Specific volts into appliance measuring whether the insulation provide is suitable.
Visual Inspection Only
In some circumstances it is necessary to carry out a visual inspection. This would be advised by the engineer and discussed with the customer. Examples of this would be server equipment in offices.