Electrical supply system

An electrical supply system comprising a track having an elongate insulating member defining first and second channels and first and second electrical conductors housed in the first and second channels respectively so as to extend longitudinally of the track in spaced apart relationship, the supply system further comprising a plurality of like connectors each having attachment means operable to attach the connector to the track at a continuously adjustable position along its length and contact means making electrical contact with the track when so attached, and wherein each connector comprises a sheet of resilient metallic material having longitudinally extending first and second edge portions, the sheet being shaped by bending such that the edge portions are insertable into the channels and having a shape memory such that when inserted the edge portions are resiliently biased into the channels to thereby constitute the attachment means, the channels being partially occupied by the first and second conductors respectively and the edge portions being of unequal lateral extent such that only the first edge portion makes contact with one of the first and second conductors to thereby constitute the contact means, whereby each connector is selectively attachable in either a first or second orientation relative to the track such that the contact means makes electrical contact with only the first or second conductor respectively.