Before revision: United States In electrical power , the US National Electrical Code (NEC), NFPA 70, article 725 (2005), defines low distribution system voltage (LDSV) as 0 to 49 V..
After revision: By DRAIX x nesquik x Diavolo and k1rit01United States In electrical power , the US National Electrical Code (NEC), NFPA 70, article 725 (2005), defines low distribution system voltage (LDSV) as 0 to 49 V..