OSHA's regulations on Electrical safety can be found in Title 29, CFR 1910 Subpart O
OSHA's regulations on PPE can be found in Title 29, CFR 1910 Subpart I
The ANSI standard that covers electrical safety is ANSI/NFPA 79 -- Electrical Standards for Industrial Machinery
The ANSI standard that cover electrical PPE is ANSI/NFPA 70E -- Personal Protective Equipment.