Patent Description:
In particular, the disclosure relates to an arrangement also with a cover for the cable connector, which may be used for low and medium voltage power lines.

Cable connectors are used to join cables to other cables, for example by cable splicing, or to terminal bodies. By securing the cables within the connector by fasteners such as screws or bolts, the requirement for additional fastening devices in assembling the connection may be disposed of.

A particular type of cable connectors, which may be used for low and/or medium voltage lines, is one that is adapted for installations where long-term durability is important and there is no need to repeatedly screw and unscrew the connectors, such as connections of underground cables. These cable connectors can be adapted for fasteners such as shearing screws which clamp the cable to the cable connector so that an electric connection is formed within the cable connector. For this purpose, the cable connector itself can be conductive to so that the electric current from the cable can be conducted through the connector.

It is a common problem that the ends of the fasteners may extend outward from the surface of the connector, even in the case when shearing screws or bolts which break upon installation are used. This may cause both mechanical abrasion from the edges of the fasteners and concentration or peaks in the electric field in the region of the connector. In particular, cable connectors can be used with protecting sleeves such as cold shrink sleeves or heat shrink sleeves, which may easily be damaged by the fasteners, e.g. from the sheared end of a shearing screw or bolt.

The problem has been addressed by hammering the edges of the fasteners so that they align with connector body and by lining the fastener ends with mass.

For example, <CIT> discloses a separable splice connector which is particularly suitable for <NUM>/<NUM> kV, <NUM> ampere primary distribution system cables. <CIT> discloses color coding accessories for cables and connectors. <CIT> discloses a field installable, field adjustable angled boot for multi-conductor cables. <CIT> discloses a connector for the connection of two electrical conductors. <CIT> discloses a protective cap for terminals.

An objective is to eliminate at least some of the drawbacks pertaining to the solutions referred to above. In particular, an objective is to disclose an arrangement with a cover for a cable connector which may be used to smoothen mechanical and/or electrical disturbances resulting from the fasteners of a cable connector. These objectives are solved according to the invention by the arrangement of claim <NUM>. Further advantageous developments of the invention appear from the dependent claims.

By cable, it is meant here an elongated electrical conductor, which may be a transmission line in an electric power network. The cable connector is a device suitable for connecting one or more cables to each other or to an external body. For example, the cable connector may be a connector comprising two or more inlets for connecting cables to each other, for example spliced cables. The cables may be uncovered at the end entering the cable connector, so that they are exposed for direct galvanic contact. Word "inlet" has been used here as the inlets provide access in to the connector body, but it is acknowledged that, for example, the word "outlet" may be used interchangeably as the inlets also provide an exit point for the cables. The cable connector may also be a cable lug or a cable shoe (hereinafter "cable lug") for acting as a terminal connection for at least one cable, the cable lug having one or more inlets for cables. As the cable lug functions as a terminal connection for a cable, the cable connector may only connect the cable to external bodies and the cable remains electrically disconnected from any other cables within the cable connector.

By fasteners, it is meant here fastening elements, such as screws or bolts, suitable for fastening the cable to the connector, for example by clamping the cable to the connector. The fasteners may be shearing screws (which can also be referred as "shearing bolts" etc.) adapted for a portion of their screw body to be sheared off upon installation. The fasteners may be threaded. The connector comprises at least one hole or bore for a fastener, which may also be threaded and which are hereinafter referred to as "screw holes".

The cover as disclosed may be used for cable connectors in electrical grids, e.g. low-voltage and/or middle voltage transmission lines. This may involve, for example, voltages of <NUM>-<NUM> kV. The screws required for this purpose are typically very strong, metallic screws having diameters of one or more centimeters, for example around two centimeters. Consequently, the force required to install them is also notable. The cover may be installed under a sleeve such as a cold-shrink sleeve or a heat-shrink sleeve. In this way, the cover is used between the cable connector and the sleeve so that it can protect the latter from damage.

According to the invention, an arrangement comprises a cover, a cable connector and a fastener adapted for clamping a cable to the cable connector.

The cable connector is a cable lug or a connector comprising two or more inlets for connecting cables to each other. It comprises a cylindrical body having at least one screw hole for a fastener, the at least one screw hole extending transversely with respect to the longitudinal direction of the cylindrical body. The cover is made of a flexible material and comprises a first edge, a second edge, a longitudinal axis extending between the first edge and the second edge, an inner surface for engaging the cable connector, and an outer surface opposite to the inner surface. The cover has a cross section substantially corresponding to a circular arc in a plane perpendicular to the longitudinal axis and extending along the whole length of the cover. The cover is adapted for snap-on attachment to the cylindrical body by a force exerted on the outer surface in a direction perpendicular to the longitudinal axis. This is effected by using flexible material in the cover and it allows the snap-on attachment to take hold quickly and easily. The length of the circular arc is more than <NUM> percent of the circumference of a full circle allowing sides of the cover corresponding to the circular arc to effect the snap-on attachment. This allows the sides of the cover corresponding to the circular arc to effect the snap-on attachment as an alternative to, for example, only effecting the attachment by one or more projections extending into one or more screw holes of the cable connector. The sides effecting the attachment may extend all the way along the length of the longitudinal axis to form a continuous gripping surface on the opposite sides of the cable connector. The sides may also form more than one continuous gripping surface on each of the opposite sides of the cable connector, for example forked gripping surfaces. The solution allows screw holes in the cable connector to be covered and the cover to be easily and quickly installed without additional tools or materials such as sealing or adhering materials.

In a further implementation form, the length of the circular arc is less than <NUM> percent of the circumference of a full circle. Reducing the length of the circular arc from <NUM> percent of the circumference allows simplifying the snap-on attachment of the cover. For example, the force exerted to effect the snap-on attachment may thus be prevented to bend or damage the cover.

In a further implementation form, the cover comprises at least one region of reduced thickness for alignment with at least one edge of a screw hole in the cable connector. This allows fitting the cover tightly against the cable connector thus preventing ingress of dust, particles or water between the cover and the connector. It may also improve the attachment of the cover to the connector by increasing friction as the contact becomes more tight-packed. In a yet further implementation form, the at least one region of reduced thickness is ring-shaped. This allows tight packing with fasteners having circularly-shaped ends.

In a further implementation form the cover comprises at least one recess extending from the inner surface for alignment with at least one screw hole in the cable connector. This allows accommodating fastener ends extending from the screw holes of the cable connector within the cover so that the contact between the cover and the cable connector becomes more tight-packed.

In a further implementation form, the cover comprises at least one bulge extending from the outer surface for alignment with at least one screw hole in the cable connector. With such a bulge, a recess may be created extending from the inner surface to accommodate a fastener end while maintaining the thickness of the cover constant for the region adapted for alignment with the screw hole and the region around the screw hole. This allows simplifying the manufacturing process and saving material.

In a further implementation form, the cover comprises at least one protrusion extending from the inner surface for engaging a screw hole in the cable connector or a hole in a fastener located in a screw hole in the cable connector. These protrusions allow positioning the cover with respect to the fasteners to speed up and simplify installation. The protrusions may be used for preventing the cover to move in one or more directions with respect to the cable connector. For example, they may prevent the cover from rotating around the longitudinal axis of the cable connector or moving in the longitudinal direction of the cable connector. The protrusions may, additionally, be adapted to effect, at least partially, snap-on attachment of the cover to the cable connector. In a yet further implementation form, the at least one protrusion is adapted to abut against an edge of the screw hole or an edge of a hole in a fastener located in the screw hole. This may further aid in positioning and/or attaching the cover by creating friction between the edge and the protrusion.

In a further implementation form, the cover comprises or is made of material conducting electricity. This allows the cover to smoothen the electric fields that may otherwise concentrate due to sharp features of the fasteners.

In a further implementation form, the cover is semiconducting. In a yet further implementation form, the cover is made of semiconducting plastic. This allows the cover itself to function as a conductor to flatten out any peaks of electricity. By using semiconducting plastic, the cover may be made light, flexible and it may be manufactured efficiently.

In a further implementation form, the cover is symmetric with respect to a rotation of <NUM> degrees about an axis perpendicular to the longitudinal axis. The symmetric shape may include the surfaces of the cover. It may also include any recesses or bulges therein. The symmetric shape facilitates ease of installation as the cover may be attached to the cable connector either the first edge or the second edge facing front.

The cover may be removably attachable to the cable connector. It may also be fixedly attached to the cable connector, for example along an edge or through an extension.

It is to be understood that the aspects and embodiments of the invention described above may be used in any combination with each other. Several of the aspects and embodiments may be combined together to form a further embodiment of the invention.

Like references are used to designate equivalent or at least functionally equivalent parts in the accompanying drawings.

The detailed description provided below in connection with the appended drawings is intended as a description of the embodiments and is not intended to represent the only forms in which the embodiment may be constructed or utilized. However, the same or equivalent functions and structures may be accomplished by different embodiments.

<FIG> illustrates a cable connector <NUM> (below, referred to as "connector"). The connector <NUM> has a body <NUM>, the surface of which may be curved. The surface may also be smooth. The body <NUM> may be substantially cylindrical to allow convenient accommodation of cylindrical cables. The body <NUM> comprises one or more inlets <NUM> for cables, for example one or more inlet <NUM> when the connector <NUM> is a cable lug or two or more inlets when the connector <NUM> is adapted for connecting two cables together. The inlets <NUM> may be circular openings. The body <NUM> comprises a bore, which may be cylindrical, for accommodating one or more cables. The bore may be an open bore but it may also be a closed bore, for example when the connector <NUM> is a cable lug. The bore may comprise threads or grooves <NUM> along the whole or partial length of the bore. The threads or grooves <NUM> may be adapted to form contact interfaces for transmitting electric current from a cable placed inside the connector into the body <NUM>. Threads <NUM> may also be included for attaching the connector <NUM> to external bodies, for example to a collar or a flange. The diameter of the body <NUM>, in the plane perpendicular to the longitudinal direction, may be, for example, <NUM>-<NUM> centimeters. The length of the body <NUM> may be, for example, <NUM>-<NUM> centimeters. The body <NUM> or the whole connector <NUM> may be made of rigid material. In particular, the body <NUM> or the connector <NUM> may be made of metal.

The connector <NUM> comprises one or more screw holes <NUM> (pictured here with fasteners <NUM> within) in the body <NUM>. The number of holes may be, for example, from one to ten. For example, the number may be one for a cable lug, or two or four for a connector suitable for two cables. The holes <NUM> may be cylindrical. The holes <NUM> have edges <NUM>, which may be substantially circular or oval or, in particular when the surface of the body <NUM> is curved, whose planar projection may be circular or oval. The holes <NUM> may extend transversely with respect to the longitudinal direction of the body <NUM>. For example, the holes <NUM> may extend radially towards the central axis of the body <NUM>. The holes <NUM> may, for example, be positioned in a single line or in two lines (the latter alternative pictured). The holes <NUM> may comprise threads for the fasteners <NUM>. When the fasteners <NUM> are installed in the connector <NUM>, the fasteners <NUM> or their edges may extend above the surface of the body <NUM>, in particular when the surface of the body <NUM> is curved. A fastener <NUM> may, in turn, comprise a hole <NUM> in the longitudinal direction. Such holes <NUM> may be cylindrical. They may also be tapered or comprise a tapered portion. The holes <NUM> may be open bores, i.e. through-holes, or closed bores.

A cable may be a single-wire conductor or a multi-wire conductor. It may comprise or be made of metal, for example of aluminum or copper. The fasteners <NUM> is adapted for clamping the cable to the connector <NUM>. The fasteners <NUM> may be screws or bolts, for example shearing screws or shearing bolts, which break upon installation. The fasteners <NUM> may be made of electrically conductive material, for example metal.

Even though the connector <NUM> has been illustrated in <FIG> to comprise two inlets <NUM>, the number and/or positioning of the inlets <NUM> may also differ. For example, the connector <NUM> may comprise two or more inlets positioned perpendicularly with respect to each other in a transverse dimension of the connector <NUM>.

In an embodiment, the body <NUM> is joined with a second body to form a cable connector, the combination which may form a monolithic body. For example, the body <NUM> may be joined with an extension providing an attachment point through which the connector <NUM> may be attached to an external object. In particular, an attachment point may be included when the connector <NUM> is a cable lug.

<FIG> illustrates a cover <NUM>. The cover <NUM> is adapted for locking to a cylindrical object, which may have holes extending transversely to its longitudinal direction. The cylindrical object may also have a smooth outer surface. In particular, the cylindrical object may be any type of connector <NUM> described in the present disclosure.

The cover <NUM> has a first edge <NUM>, a second edge <NUM> and a longitudinal axis <NUM> extending between the edges. The longitudinal axis <NUM> may extend all the way from the first edge <NUM> to the second edge <NUM>. It may also intersect the midpoint of the first edge <NUM>, the second edge <NUM> or them both. At least one of the first edge <NUM> and the second edge <NUM> may be perpendicular to the longitudinal axis <NUM> at the point of intersection of the edge <NUM>, <NUM> and the axis <NUM>. At least one of the first edge <NUM> and the second edge <NUM> may be curved, for example having the shape of a circular arc. Various alternative shapes are possible as well. In addition, the cover <NUM> may comprise one or more additional edges <NUM> such as side edges. In the example of <FIG>, an example having two side edges <NUM> is illustrated. The additional edges <NUM> may be straight or substantially straight lines. The additional edges <NUM> may be parallel to the longitudinal axis <NUM>. A gripping surface created by the cover <NUM> may be controlled by the shape of the edges <NUM>, <NUM>, <NUM>.

The cover <NUM> comprises an inner surface <NUM> and an outer surface <NUM>, the former being located on the opposite side of the cover <NUM> with respect to the latter. The inner surface <NUM> has been adapted for engaging the connector <NUM>. In particular, the inner surface may be shaped to follow the surface of the body <NUM> of the connector <NUM>. The shape of the inner surface <NUM> may be adapted for locking the cover <NUM> to the connector <NUM> at least in the dimensions perpendicular to the longitudinal axis <NUM> and optionally also in the direction of the longitudinal axis <NUM>. The longitudinal axis <NUM> may be as being parallel to the inner surface <NUM> or the outer surface <NUM>. It may be further defined to be positioned on the inner surface <NUM> or the outer surface <NUM>. The longitudinal axis <NUM> may be located substantially on the center of the inner surface <NUM> or the outer surface <NUM>. At least one of the inner surface <NUM> and the outer surface <NUM> may be symmetric with respect to the longitudinal axis <NUM>, as illustrated in <FIG>. Consequently, the cover <NUM> may be symmetric with respect to the longitudinal axis <NUM>. At least the inner surface <NUM> may be curved in the direction perpendicular to the longitudinal axis <NUM>. This allows the cover <NUM> to follow the shape of the connector <NUM>. For this purpose, the inner surface <NUM> may be concave. The outer surface <NUM> may be convex. As in the example illustrated in <FIG>, the whole cover <NUM> may be curved in the direction perpendicular to the longitudinal axis <NUM>. The cover <NUM> may be shaped substantially as a curved rectangle, as illustrated, a shape which may be easily manufactured and which is resistant to breaking as the number of fragile features may be limited. Also other shapes are possible, for example an oval shape or a circular shape. Any corners in the shape may be rounded to avoid mechanical abrasion and/or build-up of electromagnetic fields. The inner surface <NUM> may be adapted for adhesive attachment. For example, it may be fully or partially adhesive or fully or partially coated with adhesive material. The cover <NUM> may be united throughout its surface, i.e., the whole surface may be unbroken so that it has no holes.

In an embodiment, the cover <NUM> is symmetric with respect to a rotation of <NUM> degrees about an axis perpendicular to the longitudinal axis <NUM>. The axis may additionally be perpendicular to the tangent of at least one of the first edge <NUM> and the second edge <NUM> at the intersection between said edge <NUM>, <NUM> and the longitudinal axis <NUM>. When the cover <NUM> is symmetric so that the either of the first edge <NUM> and the second edge <NUM> may function as a front edge, the ease of installation may be improved.

While the exact shape of the cover <NUM> may vary, the cover <NUM> has a cross section corresponding or substantially corresponding to a circular arc. The cross section is in a plane perpendicular to the longitudinal axis <NUM>. The circular-arc cross section extends along the whole length of the cover. The cover <NUM> may be of substantially uniform thickness. The thickness of the cover may be, for example, <NUM>-<NUM> millimeters.

The cover <NUM> is adapted, e.g. shaped, for snap-on attachment to a cylindrical body, in particular to the connector <NUM>. The snap-on attachment takes place at least in the two dimensions perpendicular to the longitudinal axis <NUM>. This may mean, for example, that a detachment force exceeding a threshold detachment force is required to detach the cover <NUM>. The snap-on attachment may therefore substantially prevent movement of the cover with respect to the connector <NUM> at least in the two dimensions perpendicular to the longitudinal axis <NUM>. It may also prevent movement of the cover with respect to the connector <NUM> in the direction of the longitudinal axis <NUM>. The snap-on attachment may be effected, for example, by gripping surfaces formed in the inner surface <NUM> for contact with the outer surface of the connector <NUM> and/or grip formed between the cover <NUM> and screw holes <NUM> in the connector <NUM> or holes <NUM> in the fasteners <NUM> in the connector <NUM>. The cover <NUM> is made of flexible material to facilitate the snap-on attachment. For example, the cover may be made of plastic. Even when the cover <NUM> is flexible, it may still have a static shape to which it returns in the absence of bending forces exerted on the cover <NUM>. Whereas it is evident that a strong enough force will break any physical object, the cover <NUM> may have a first threshold force below which the cover <NUM> will return to its static shape by itself. The first threshold force may be a breaking force or a permanent deformation force. The cover may be adapted to be used in the static shape. The cover may be of transparent or partially transparent material, which may aid in positioning the cover, particularly with respect to screw holes <NUM>. The cover <NUM> may be adapted to be installed simply by pressing the cover <NUM> on top of the connector <NUM>. In particular, the cover <NUM> is adapted for snap-on attachment by exerting a force, such as a pressing force, on the outer surface <NUM> of the cover <NUM> in a direction perpendicular to the longitudinal axis <NUM>. The direction may additionally be perpendicular to the tangent of at least one of the first edge <NUM> and the second edge <NUM> at the intersection between said edge and the longitudinal axis <NUM>. The cover <NUM> may be adapted for a second threshold force so that only a force exceeding the second threshold force attaches the cover <NUM>. When the cover <NUM> additionally has a first threshold force, either or both of the pressing force and the second threshold force may be smaller than the first threshold force.

The length of the circular arc is more than <NUM> percent of the circumference of a full circle, i.e. the circular arc corresponds to an angle which is larger than <NUM> degrees or larger than pi in radians. For example, the length may be more than <NUM> percent or more than <NUM> percent of the circumference of a full circle. The length of the circular arc may also be less than <NUM> percent of the circumference of a full circle to facilitate easier installation. For example, the length of the circular arc may be any of the following: less than <NUM> percent, less than <NUM> percent, less than <NUM> percent, less than <NUM> percent or less than <NUM> percent of the circumference of a full circle. By lowering the percentage, material may be saved and ease of installation improved, whereas by increasing the percentage the gripping surface may be increased. The length of the circular arc may vary across the length of the cover <NUM> or it may be constant across the length of the cover <NUM>. Any of the above values for the length of the circular arc may correspond to cross-sections along the whole length of the cover <NUM> or the length of the circular arc may be more than <NUM> percent of the circumference of a full circle only for a partial length of the cover <NUM>, for example <NUM>-<NUM> percent of the length of the cover. The gripping surfaces created by the arc extending around the connector provide one way of realizing the snap-on attachment.

In an embodiment, the cover <NUM> comprises at least one recess (not visible in <FIG>) extending from the inner surface <NUM> for alignment with at least one screw hole <NUM> in the connector <NUM>. The recess may be circular or substantially circular. The depth of the recess may be, for example, <NUM>-<NUM> millimeters. The diameter of the recess may be at least that of a screw hole <NUM>, for example <NUM>-<NUM> millimeters. The recess allows accommodating the ends of the fasteners <NUM> within the cover <NUM>.

In an embodiment, the outer surface <NUM> is smooth. In another embodiment, the cover <NUM> comprises at least one bulge <NUM> extending from the outer surface <NUM> for alignment with at least one screw hole <NUM> in the connector <NUM>. As the bulge creates a recess on the opposing side of the cover <NUM>, i.e. on the inner surface <NUM>, the bulge allows accommodating the ends of the fasteners <NUM> within the cover <NUM>. In addition, as the cover <NUM> bulges outwards, a need to reduce the thickness of the cover <NUM> at the region of the cover <NUM> corresponding to the bulge <NUM> may be removed. For example, the thickness of the cover <NUM> may therefore be constant, in particular the thickness of the cover <NUM> may be constant between the region of the cover <NUM> adapted for alignment with the screw hole <NUM> and the region around the screw hole <NUM>. The bulge <NUM> may be circular or substantially circular. The height of the bulge <NUM> may be, for example, <NUM>-<NUM> millimeters. The diameter of the bulge <NUM> may be at least that of a screw hole <NUM>, for example <NUM>-<NUM> millimeters.

The number of recesses and/or bulges <NUM> may correspond to the number of screw holes <NUM> in the connector <NUM>. For example, the number of recesses and/or bulges <NUM> may be from one to ten. For example, the number may be one for a cover adapted for a cable lug, or two or four for a cover adapted for a connector suitable for two cables.

<FIG> illustrates an arrangement <NUM> comprising a connector <NUM> and a cover <NUM>. The arrangement <NUM> may be constructed using any of the connectors <NUM> and covers <NUM> described herein. The cover <NUM> may be removably attachable to the connector <NUM> or it may be fixedly attached to the connector <NUM>, for example along an edge or by an extension. Additional layers may be included in the arrangement <NUM> to form a connector arrangement. For example, the arrangement <NUM> may be covered by an insulating layer, for example by a silicone insulator. The cover <NUM> may then protect this additional layer from mechanical abrasion due to the fasteners <NUM>.

<FIG> illustrates a cross-section of <FIG> in a plane perpendicular to a longitudinal axis of the cover <NUM>. The connector <NUM> is shown with a fastener <NUM> installed in a screw hole <NUM> comprising threads <NUM>. The fastener <NUM> comprises a hole <NUM> and threads <NUM>. The fasteners <NUM> may be shearing screws or shearing bolts and they may comprise weakenings <NUM> such as breaking points <NUM>. In the illustrated example, the end of the fastener <NUM> extends outside the connector <NUM>.

The cover <NUM> has a cross section substantially corresponding to a circular arc <NUM>. In the illustrated example, the cross section is circular along the length of the cover <NUM>. In addition, the length of the arc remains substantially constant along the length of the cover <NUM>. However, it is noted that alternative embodiments are also possible. For example, the cross section taken at all points along the length of the cover <NUM> may be circular or substantially circular while the length of the circular arcs <NUM> corresponding to the cross sections may vary along the length of the cover <NUM>, for example between <NUM> and <NUM> percent of the circumference of a full circle. Correspondingly, the surface of the cover <NUM> may form one or more tooth- or fork-like gripping surfaces which may additionally be suitable for snap-on attachment to the connector <NUM>.

The cover <NUM>, according to the example illustrated in <FIG>, comprises a region of reduced thickness <NUM> for alignment with at least one edge of a screw hole <NUM> in the connector <NUM>. The region <NUM> allows improving fitting of the cover <NUM> against the connector <NUM> even as the edges of the fastener <NUM> extend outwards from the outer surface of the connector <NUM>. The region <NUM> may be line-shaped. In particular, the region <NUM> may be circular or ring-shaped to match the edge of a circular-ended fastener. The region <NUM> may be positioned within a bulge <NUM> extending outwards from the outer surface <NUM> of the cover <NUM>.

The cover <NUM> may comprise at least one protrusion <NUM> extending from the inner surface <NUM> for engaging a screw hole <NUM> in the connector <NUM> or a hole <NUM> in a fastener <NUM> located in a screw hole <NUM> in the connector <NUM>. The protrusion <NUM> is positioned to match the screw hole <NUM>. It may be used to aid in positioning the cover <NUM> with respect to the connector <NUM>. It may also be used for providing at least partial snap-on attachment. Yet in addition, the protrusion <NUM> may be used to prevent movement of the cover <NUM> with respect to the connector <NUM> at least in the direction of the longitudinal axis <NUM>. The protrusion <NUM> may be of the same material as the cover <NUM>. It may form a monolithic body with the cover <NUM> and it may have various shapes.

<FIG> illustrates various protrusions <NUM>. The protrusions <NUM> may be arranged on the inner surface <NUM> of the cover <NUM> substantially on a line <NUM>. The line <NUM> may be aligned with the edge <NUM> of a screw hole <NUM>. The line <NUM> may be circular. There may be more than one protrusion <NUM> corresponding to a single screw hole <NUM>. For example, a protrusion <NUM> may extend all the way along the length of the line <NUM> or it may be divided into two or more shorter portions, an example of which is illustrated in <FIG>. One or more protrusions <NUM> may also be located within a region enclosed by the line <NUM> for engaging holes <NUM> in fasteners <NUM>, examples of which are illustrated in <FIG>. When there is more than one protrusion <NUM> corresponding to a single screw hole <NUM>, the protrusions may be located both on the line <NUM> and within a region enclosed by the line <NUM>. The protrusions <NUM> may be, for example, cone-, tooth-, tongue- or edge-shaped. The protrusions <NUM> may, for example, have height of <NUM>-<NUM> millimeters in the direction perpendicular to the inner surface <NUM>. In an embodiment, at least one protrusion <NUM> is adapted to abut against an edge <NUM> of a screw hole <NUM> in the connector <NUM> or an edge of a hole <NUM> in a fastener <NUM> located in the screw hole <NUM>.

In an embodiment, the cover <NUM> comprises or is made of material conducting electricity. The material may be fully conducting or semiconducting. The cover <NUM> may therefore be in the same electric potential as the connector <NUM>, smoothening any peaks in the electric field in the region of the connector <NUM>. In particular, the whole cover <NUM> may be fully conducting or semiconducting. In an embodiment, the cover <NUM> is made of semiconducting plastic.

Claim 1:
An arrangement comprising a cover (<NUM>),
a cable connector (<NUM>) and a fastener (<NUM>)adapted for clamping a cable to the cable connector (<NUM>);
the cable connector (<NUM>) comprising a cylindrical body (<NUM>) having at least one screw hole (<NUM>) for the fastener (<NUM>),
the at least one screw hole (<NUM>)
extending transversely with respect to the longitudinal direction of the cylindrical body (<NUM>), the cable connector (<NUM>) being a cable lug or a connector comprising two or more inlets (<NUM>) for connecting cables to each other;
the cover (<NUM>) being made of a flexible material and comprising a first edge (<NUM>), a second edge (<NUM>), a longitudinal axis (<NUM>) extending between the first edge (<NUM>) and the second edge (<NUM>), an inner surface (<NUM>) for engaging the cable connector (<NUM>), and an outer surface (<NUM>) opposite to the inner surface (<NUM>);
characterized in that
the cover (<NUM>) has a cross section (<NUM>) substantially corresponding to a circular arc in a plane perpendicular to the longitudinal axis (<NUM>) and extending along the whole length of the cover (<NUM>);
the cover (<NUM>) is adapted for snap-on attachment to the cylindrical body (<NUM>) and the cover (<NUM>) is adapted for snap-on attachment by a force exerted on the outer surface (<NUM>) in a direction perpendicular to the longitudinal axis (<NUM>); and
the length of the circular arc is more than <NUM> percent of the circumference of a full circle allowing sides of the cover corresponding to the circular arc to effect the snap-on attachment.