Formal Visual Inspections

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This is carried out at pre-determined intervals. It is quite straightforward and consists of visually inspecting the power cable, appliance and plug for any obvious problems and the results recorded. At this stage, it is important to open the plug and check that the wiring is sound. According to the HSE, this stage can result in more than 90% of potential problems being spotted. Some examples of faults that may be observed are shown below.

Users need to be encouraged to look critically for signs of possible hazard every time they use electrical equipment. This can be done easily by making everyone aware of what is considered to be bad practice. Primary Current Injection Test Set is one way of doing this. It is also good practice to introduce this as part of the induction process for new staff or at regular staff meetings.

Testing for a failed open compressor is easy. Pop the electrical cover for the compressor off, and remove the wires and the thermal limiter. Using an ohmmeter, measure the impedance from one terminal to another across all three terminals of the compressor. Also measure the impedance to the case of the compressor for all three terminals.