PAT Testing - In-service Inspection and Testing of Electrical Equipment
This is a process of simply inspecting the appliance, the cable and the plug for any obvious signs of damage. According to the HSE, this process can find more than 90% of faults.
Earth Continuity Test
This test shows the resistance offered by the earthing rods with the connection leads.
Insulation Resistance Test
This test demonstrates that equipment shall have a measured resistance of the protective earth circuit, or the earthing conductor of an extension cord or appliance cord set.
Protective Conductor/Touch Current Measurement
The protective conductor current / touch current is measured from the internal live parts to Earth for Class I equipment, or from the internal live parts to accessible surfaces of Class II equipment.
Extra Low Voltage Test (SELV)
The IEC and IET define actual types of extra-low voltage systems, for example SELV (Separated or safety extra low voltage) which are less than 50 V. Modern battery-operated hand tools fall in the SELV category. SELV tests are commonly visual.
Where the sockets are polarised, polarity testing is carried out to determine whether the active and neutral of the plug end are correctly connected to the corresponding terminals at the socket end.
A residual-current device (RCD), or residual-current circuit breaker (RCCB), is a device that instantly breaks an electric circuit to prevent serious harm from an ongoing electric shock. Testing ensures that RCDs/SPDs/Safety Switches are working correctly.
Leakage Test (Microwave)
Testing is performed by checking over the areas where the door meets the casing to find any radiation hot-spots whilst the unit is operating.