Please can somebody with a bit of electrical knowledge advise on the requirements for earthing a metal enclosure? This enclosure will contain some electrical equipment, some of which is 230v. All of the internal components are earthed in their own right and do not need to be put inside and kind of enclosure, such as, there will be a control box with its own plastic enclosure and its own internal earthing. Therefore my argument is that there is no need earth the outer metal enclosure. But I have been told that as I have put a metal enclosure round the entire product that means it must be earthed. My customer has given me a description of how the enclosure needs to be earthed. He said all accessible metal parts, other than actuating members, of in-line cord, free-standing and independently mounted controls of class 0I and class I which may become live in the event of an insulation fault, shall be permanently and reliably connected to and earthing terminal or termination within the control, or to the earthing contact of an equipment inlet. There is a lot there Iâ€™m not familiar with such as what is; An actuating member? In-line cord? Class OI? Class I? An insulation fault? (Does this mean a partly severed wire?) All of the metalwork is painted does this change anything? Such as if I canâ€™t put a multi-meter on it to see if I have continuity between the part and the earth bar, then does none of the above apply? I have been told (I canâ€™t remember who by) that I would need to scratch off a little bit of paint on each part to carry out the test. This seems ridiculous to me as we reject any metal work that has scratches on it (even tiny ones!). Any help would be appreciated.