Article 810 of the National Electrical Code, ANS/NFPA 70 provides information with regard to proper grounding of the mast and supporting structure, grounding of the lead-in wire to an antenna-discharge unit, size of grounding conductors, location of antenna-discharge unit, connection to grounding electrodes, and requirements for the grounding electrode (see figure). Antenna Lead-In Wire Ground Clamp Electric Service Equipment Antenna Discharge Unit {NEC Section 810-20) Grounding Conductors (NE