I have just bought some track lighting from Ledkia http://www.ledkia.com/uk/127-buy-led-track-lighting It has two live tracks (one live, one neutral on either side) and earthing is through the metal of the track, with green/yellow cable screwed to the track in order to link different 1m sections. Obviously an afterthought, but earth cables are earth cables. The Dora 30W spotlights have a plastic 'leg' to attach them to the track. The bulb is held in a plastic lampholder (in usual LED fashion). On the back of the bulb is the black metal heat dissipation system, with vanes. The power for the bulb comes from two small wires, red and black, which come out of the plastic leg through the vane, to the LED bulb. Should the metal heat dissipation system be earthed? Or is there a transformer somewhere in the plastic 'leg' which means those small wires are only 12V? Thanks very much.
if it is insulated from the live parts by basic and supplementary insulation then it seams to be ok for this to be unearthed (reading from the code of pratice for in-service inspection and testing of electrical equipment 4th edition page 73 fig 11.3)
cant think it wouldnt be but it may not however it may be a 12volt transformer or driver mounted in each track (some the early models had 12volt tracks but wernt linkable) if low voltage your likely to be right where the transformer would be