Ground terminal block, 283 Series, operating tool Connecting conductors is quick and easy with this ground terminal block (item number 283-677). Conductors should only be connected to this ground terminal block if their strip length is between 16 and 17 mm . Ground terminal blocks connect directly to the mounting rail via an integrated contact foot. This creates an electrical and mechanical link between the electrical conductors and the mounting adapter. This product features conductor terminals and utilizes CAGE CLAMP®. Our highly-rated and maintenance-free CAGE CLAMP® connection makes it easy to connect all types of conductors without having to prepare the conductor. For example, you don't need to crimp ferrules. This ground terminal block is suitable for conductor cross sections ranging from 0.2 mm² to 16 mm². This through rail-mount terminal block is operated with an operating tool.