(57) A unit with clamps for engaging the conductors of a bipolar cable to the clamps comprising
a substantially column-shaped member with a transversal bore, a member which can be
moved along the column-shaped member and a spring acting along the axis of said column
member on said mobile member; a single element made of insulating material substitutes
the mobile members of the two clamps, and is resiliently urged, so that one only thrust
operation is carried out in order to engage the conductors in the clamp bores.
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