Abstract: An electrician had pulled some conductors from a junction box to inspect them. After the electrician finished the inspection, an apprentice electrician put the 277-volt conductors back into the box. The No. 12 AWG conductors were spliced with red Ideal wire nuts designed for use with conductors sized from No. 10 to 18 AWG. The electrician had failed to notice during the inspection that one of the ungrounded circuit conductors was stripped back about 3 millimeters past the end of the wire nut. The apprentice contacted the bare portion of the conductor as he was pushing the energized conductors back into the box. (The circuit was energized to provide lighting for the working office area.) He received an electric shock and was hospitalized for his injury.