Phoenix Contact 3076039 To securely install the neutral busbar, support brackets must be placed at both ends of each terminal strip and every 20 cm on longer strips, as specified by Phoenix Contactcontact.com/products. The installation requires a nominal voltage of 400 V, a nominal current of 38 A, and is achieved through screw connections in one level, with rated cross sections ranging from 0.2 mm2 to 10 mm2, and mounted using the NS 35/7,5 or NS 35/15 type bracket, all with a gray color.