Martindale vipdlok150 with vi 15000 voltage indicator and pd690 proving device martindale vi 15000 the martindale vi 15000 has a 1000v cat iv safety rating and led indication for acdc voltages from 50v to 690v and above ensuring compliance with health and safety recommendations for safe working in all bs en61010 installation categoriesits the simplest and most reliable way to ensure circuits have been de energised and properly isolated prior to maintenance and modificationsbased on the i