An electrical apparatus including electrical components, wherein at least one of the electric components is a monitoring device including electromagnetic radiation receiving means connected to at least one sensor, the electromagnetic radiation receiving means for receiving electromagnetic radiation from electromagnetic emitting means, wherein the electromagnetic radiation receiving means are located on a side of the electrical apparatus and are for being directed towards a support including means for emitting an electromagnetic radiation, and the electromagnetic radiation receiving means is for supplying electrical power upon receipt of electromagnetic radiation from such means for emitting electromagnetic radiation located on such support.