Emergency light units must be regularly tested according to local and national safety codes, including NFPA 101, which states emergency lights and exit signs must be tested monthly for 30 seconds. Emergency system batteries must also be tested yearly to ensure they generate power for at least 90 minutes. The Joint Commission standard EC.02.05.07 EP 1 for health care facilities requires functional testing to be performed monthly on battery-powered emergency lighting systems used for exit signs, egress and task lighting for at least 30 seconds. Monthly visual inspections of other exit signs are also required.