Cover assemblies and methods for covering electrical cables and connections
A method for protecting a cable splice connection including a cable, the cable including an electrical conductor surrounded by a cable insulation layer, includes providing a splice body assembly including: an electrically insulative, elastomeric splice body having an interior surface defining an interior passage; and a layer of a conformable medium pre-mounted on the interior surface of the splice body. The conformable medium is a flowable, electrically insulative material. The method further includes mounting the splice body assembly on the cable splice connection such that the layer of the conformable mastic is interposed between and engages each of the interior surface of the splice body and an opposing interface surface of the cable insulation layer.
1. A pre-expanded cover assembly for protecting a cable splice connection including a cable, the cable including an electrical conductor surrounded by a cable insulation layer, the pre-expanded cover assembly comprising:
a splice body assembly including:
an electrically insulative, elastomeric splice body having an interior surface defining an interior passage; and
a layer of a conformable medium pre-mounted on the interior surface of the splice body, wherein the conformable medium is a flowable, electrically insulative material; and
a removable holdout, wherein the splice body assembly is mounted on the holdout such that the holdout maintains the splice body in an elastically radially expanded state, and the holdout is selectively removable from the splice body to permit the splice body to elastically radially contract;
wherein the layer of the conformable medium is positioned and configured such that, when the pre-expanded cover assembly is positioned adjacent the cable splice connection, the holdout is removed from the splice body, and the splice body elastically radially contracts onto the cable splice connection, the layer of the conformable medium will be interposed between and in direct contact with each of the interior surface of the splice body and an opposing interface surface of the cable insulation.
2. The pre-expanded cover assembly of claim 1 wherein the holdout includes a tubular holdout formed by a helically wound strip, and removing the holdout from the splice body assembly includes pulling the strip.
3. The pre-expanded cover assembly of claim 1 wherein the conformable medium is a mastic.
4. The pre-expanded cover assembly of claim 3 wherein the mastic is a silicone-based mastic.
5. The pre-expanded cover assembly of claim 3 wherein:
the mastic has an elongation in the range of from about 100% to 400%; and
the mastic has a hardness in the range of up to about Shore A 10.
6. The pre-expanded cover assembly of claim 3 wherein the mastic has a dielectric strength in the range of from about 450 Volts/mil to 800 Volts/mil.
7. The pre-expanded cover assembly of claim 1 wherein the layer of the conformable medium has a thickness in the range of from about 0.5 mm to 5 mm.
8. The pre-expanded cover assembly of claim 1 wherein the splice body is formed of silicone rubber.
9. The pre-expanded cover assembly of claim 1 wherein:
the cable includes a semiconductor layer surrounding the cable insulation layer; and
the pre-expanded cover assembly is configured to mount the splice body assembly on the cable splice connection such that the layer of the conformable medium is also interposed between and is in direct contact with each of the interior surface of the splice body and an opposing interface surface of the semiconductor layer.
10. The pre-expanded cover assembly of claim 1 wherein:
the splice body includes:
a Faraday cage layer including a Faraday cage interface surface forming a part of the interior surface of the splice body defining the interior passage;
a stress cone layer including a stress cone interface surface forming a part of the interior surface of the splice body defining the interior passage; and
a primary insulation layer including a primary insulation interface surface forming a part of the interior surface defining the interior passage and extending axially from the Faraday cage interface surface to the stress cone interface surface; and
the pre-expanded cover assembly is configured to mount the splice body assembly on the cable splice connection such that the layer of the conformable medium is interposed between and is in direct contact with each of the primary insulation interface surface and the opposing interface surface of the cable insulation at least from the Faraday cage interface surface to the stress cone interface surface.
11. The pre-expanded cover assembly of claim 10 wherein the pre-expanded cover assembly is configured to mount the splice body assembly on the cable splice connection such that:
the layer of the conformable medium is interposed between and is in direct contact with each of the Faraday cage interface surface and the opposing cable insulation surface; and
the layer of the conformable medium is interposed between and is in direct contact with each of the stress cone interface surface and the opposing cable insulation surface.
12. The pre-expanded cover assembly of claim 10 wherein the layer of the conformable medium extends a distance in the range of from about 50 mm to 70 mm from the Faraday cage interface surface to the stress cone interface surface.
13. The pre-expanded cover assembly of claim 1 wherein the pre-expanded cover assembly is configured to mount the splice body assembly on the cable splice connection such that, after the splice body assembly is mounted on the cable splice connection, the splice body applies a persistent radially compressive load to the layer of the conformable medium.