I-Line™ Busway offers a complete line of compatible, sandwich-type feeder and plug-in busway lengths and fittings. I-Line plug-in busway has options from 225A to 600A with aluminum or copper conductors. I-Line busway is constructed with three pole and four pole full neutral configurations for system voltages to 600 volts. This busway system is rated to allow 100% of the current to flow continuously. This I-Line plug in tap box is for 400A and 600A 3 phase, 4 wire with integral ground bus systems. I-Line busway is UL listed and CSA certified.