A trunkline has a multi-core ribbon cable with electronic modules mounted thereon at spaced intervals. The modules have pins which pass through preformed holes in the cable to make contact with the cores. The modules further have housings which seat in apertures in the cable. The modules are each retained in position by two clamping members which clip together with the module and adjacent ribbon sandwiched between them. Load devices, such as detonators are connected to the trunkline at desired positions therealong by connectors having staples that pierce the cable to make contact with the cores. Each staple is electrically connected to a core of a connecting wire by clamping the core against a base portion of the staple utilizing two plastic parts that clip together. One of these parts, in turn, is hinged to a further member which clips with the parts to clamp the cable between the parts and the further member.