Given. An overhead installation which is to add three conductors extends beyond a building where accidental contact with electrical power conductors operating over 300 volts to ground could occur. What article in the NEC contains specific requirementns for this situation?

Given. An overhead installation which is to add three conductors extends beyond a building where accidental contact with electrical power conductors operating over 300 volts to ground could occur. What article in the NEC contains specific requirementns for this situation?