A spacer device includes an elongate spacing member extending a longitudinal axis for securing to electrical transmission lines, and has a minimum thickness d.sub.m. At least one thickened portion having a thickness T.sub.t and length d.sub.t is positioned intermediate along the spacing member to form at least two column lengths L.sub.c separated by the at least one thickened portion. Each column length L.sub.c has a portion with the minimum thickness d.sub.m. The thickness T.sub.t and length d.sub.t of the at least one thickened portion can be at least two times the minimum thickness d.sub.m to form at least one end support for the at least two column lengths L.sub.c, such the at least two column lengths L.sub.c behave as separate Euler type columns for producing increased Euler buckling strength with a minimal increase in weight.

A spacer device includes an elongate spacing member extending a longitudinal axis for securing to electrical transmission lines, and has a minimum thickness d.sub.m. At least one thickened portion having a thickness T.sub.t and length d.sub.t is positioned intermediate along the spacing member to form at least two column lengths L.sub.c separated by the at least one thickened portion. Each column length L.sub.c has a portion with the minimum thickness d.sub.m. The thickness T.sub.t and length d.sub.t of the at least one thickened portion can be at least two times the minimum thickness d.sub.m to form at least one end support for the at least two column lengths L.sub.c, such the at least two column lengths L.sub.c behave as separate Euler type columns for producing increased Euler buckling strength with a minimal increase in weight.

A motion control device for an overhead utility transmission line includes a phase spacer and first and second spacer dampers connected to the phase spacer. The first spacer damper separates conductors of a first phase and the second spacer damper separates conductors of a second phase. The phase spacer separates the conductors of the first and second phases.

A spacer device includes an elongate spacing member extending a longitudinal axis for securing to electrical transmission lines, and has a minimum thickness d.sub.m. At least one thickened portion having a thickness T.sub.t and length d.sub.t is positioned intermediate along the spacing member to form at least two column lengths L.sub.c separated by the at least one thickened portion. Each column length L.sub.c has a portion with the minimum thickness d.sub.m. The thickness T.sub.t and length d.sub.t of the at least one thickened portion can be at least two times the minimum thickness d.sub.m to form at least one end support for the at least two column lengths L.sub.c, such the at least two column lengths L.sub.c behave as separate Euler type columns for producing increased Euler buckling strength with a minimal increase in weight.

A liner for use with a cable spacer clamp arm is provided. The liner includes a first portion formed in an arcuate configuration and made from a first elastomeric material. A second portion is formed in the arcuate configuration and is receivable within the first portion. The second portion is made from a second elastomeric material different from the first elastomeric material. The first portion attaches to the second portion.

Devices and systems for supporting and spacing aerial cables of high voltage of 69 kV or above from a support cable are disclosed. The disclosed systems and devices may include a top piece configured to engage the support cable, a first arm, a second arm, and a third arm, each having a distal end and a proximal end, wherein the proximal ends of the first, second, and third arms are connected to the top piece. The devices and systems may also include a cable fastening system located at each of the distal ends of the first, second, and third arms.

A space damper for 4-cable bundles of overhead power transmission lines is disclosed, comprising a framework (10) wherefrom four support arms (20a-20b) depart, at the distal ends of which there are provided clamps for fastening electric cables, said arms (20a-20c) being constrained to the framework (10) through respective dampening hinges (30a-30c), wherein the spacer damper is configured so that the vertical, natural-mode frequencies thereof are higher than the corresponding horizontal, natural-mode frequencies thereof.

A liner for use with a cable spacer clamp arm is provided. The liner includes a first portion formed in an arcuate configuration and made from a first elastomeric material. A second portion is formed in the arcuate configuration and is receivable within the first portion. The second portion is made from a second elastomeric material different from the first elastomeric material. The first portion attaches to the second portion.

A space damper for 4-cable bundles of overhead power transmission lines is disclosed, comprising a framework (10) wherefrom four support arms (20a-20b) depart, at the distal ends of which there are provided clamps for fastening electric cables, said arms (20a-20c) being constrained to the framework (10) through respective dampening hinges (30a-30c), wherein the spacer damper is configured so that the vertical, natural-mode frequencies thereof are higher than the corresponding horizontal, natural-mode frequencies thereof.

A clamp for a spacer-damper includes a first jaw and a second jaw connected to the first jaw. The first jaw has a first clamping surface and a first aperture. The first aperture retains the fastener in an initial position and in a second position spaced latterly from said initial position. The second jaw has a second clamping surface and an open-ended second aperture. The second aperture receives the fastener in the second position. The first jaw may also include a keeper surface for receiving the fastener in an initial position, a keeper pocket for receiving the fastener in a second position and a keeper protrusion is positioned between the keeper surface and the keeper pocket.