The LV limit for AC is now defined as 1000V between conductors, or 600V between any conductor and earth, hence my choice of 625 volts! (DC limits are 1500 and 900V.)
ELV is covered by the new part P as well. The AC limit is defined as not exceeding 50V, either between conductors or to earth.
In the actual Statutory Instrument, the DC definition of ELV is rather incomplete to my way of thinking. It just says not exceeding 120V between conductors, no mention of p.d. relative to earth.
