8:2 Shearbolt terminals Shearbolt terminals up to 36 kV Elpress shearbolt terminals are available as through connectors and terminals for: • stranded and solid Al and Cu cables • round cross section 10 to 630 mm² • sector cross section 16 to 240 mm² SL240N-12 The screws used are made of brass, that has the advantage of providing a lower friction compared to aluminium or steel screws. This makes it easier for the user to perform the installation. Installation tools can be a socket wrench or an impact wrench with torque force >100 Nm. We recommend that the fitter uses a counterhold tool to secure the shearbolt terminal more easily when tightening the screws. Handles multiple area steps The advantages of shearbolt terminals are that installation can be done easily without any heavy special tools and that they can manage several area steps in the same through connector/terminal, for example 10-50 mm². The user gets a reduced range of products and a flexible solution. Shearbolt terminals are made of hardened aluminium with an alloy that allows both copper and aluminium cable to be joined, while preventing the occurence of galvanic corrosion. To reduce the number of terminal variants, screw terminals are supplied with reduction washers that allow the use of two different bolt sizes. Washers are always needed for connecting terminals with screw joints to busbars. Use a socket wrench to tighten the screws. It is also possible to use an impact wrench. SC50R50S On the SC50R50S through connector, the screws are threaded into the sleeve and can handle all their cable areas on one thread length. SC50R50S is also suitable as a screen connector for 10-35 mm² Cu/Al. Through connector SC50R50S with pre-assembled screws. Labelling Elpress marking of shearbolt terminals shows logo, product name, cable area (for stranded and solid conductors) and shearbolt installation order. The terminal palm is marked with screw size M-thread for bolted joints. Cat. no. SL70R70S-10-12 SL = Shearbolt terminal 70R = max 70 mm² round conductor 70S = max 70 mm² sector conductor 10-12 = screw size 10 and 12 M thread Cat. no. SC50R50S SC = Shearbolt connector 50R = max 50 mm² round conductor 50S = max 50 mm² sector conductor Screw and washer The following apply for bright galvanized type nuts and screws, with strength class 8.8, used for connecting terminals with Cu and Al palms: • Always use a torque wrench to be certain the right torque is achieved. Make sure it is calibrated at regular intervals according to the supplier’s instructions. • Use the recommended torque according to the screw manufacturer’s instructions. • Always use a hard flat washer to reduce friction against the connection surface and the edge pressure, hardness min HB200. • Install as illustrated. Tightening torque Recommended tightening torque for wet lubricated screws and nuts of bright galvanized zinc type with strength class 8.8 and coarse threaded (normal thread), used with corresponding washer for connection of terminals with Cu- and Al palm. See table in Chapter 12.
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