An arrangement for connecting a powerline data transmission device or a repeater (2) in a live distribution box in a low-voltage mains network, whereby the distribution box has at least one collector rail (4) for the neutral line and at least one phase of the low-voltage mains network is fused with a high-power fuse (36), comprises a clamping strap (6), which may be connected to the collector rail (4) for the neutral lines, a second leg (10), which is supported by a contact element (14) on the opposite side of the collector rail (4), a plug (24) comprising an insulated housing (26) and an electrically-conducting contact surface (28), whereby the contact area (28) of the plug (24) is provided with a forked blade end (30) such as to be plugged into a phase-side contact region (34) of the fuse (36).