yves saint laurent y eau de toilette amazon|yves Saint Laurent Y notes What do ELV, LV and HV mean? Extra low voltage (ELV) means voltage of 50V or less (AC RMS), or 120V or less (ripple-free DC). Low voltage (LV) means voltage greater than ELV, but not more than 1000V (AC RMS) or 1500V (ripple-free DC). High voltage (HV) means voltage greater than low voltage. What You Need to Know . Subscribe