what are the steps involved in carrying out an insulation resistance test on a flourescent lighing circuit from the distribution board to the circuit. i know which is the corresponding live neutral and earth conductors. been told to carry out test at 230v and if readings okay test at 500v. problem is i dont want to damage anything on this circuit, do i need to remove lamps and have switches in closed position and what readings should i be looking for. will my readings read through any control equiptment in the flourescent light fittings there are 9 in total. would love some feed back asap