Medium Voltage Cable Splices.
Cold-shrink, heat-shrink, and pre-molded joints for shielded cable in the 5kV-35kV class — inline and transition, including separable 600A splices, classified under IEEE 404 for utility, industrial, renewable, and data center systems.
- Voltage class
- 5–35kV
- Manufacturers
- 4
- Governing standard
- IEEE 404
Manufacturers.
IEEE 404 cable joints.
IEEE 404 is the standard governing joints on shielded medium-voltage cable. It establishes electrical ratings and test requirements for joints on extruded and laminated dielectric cable, restoring the cable's full insulation and shielding performance across the connection.
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IEEE 404-2022
The governing standard — electrical ratings and test requirements for cable joints used with extruded and laminated dielectric shielded cable, rated in preferred voltage steps from 2.5 kV through 500 kV, including joint jacket-seal and metallic-shield devices.
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Heat-cycle qualification
IEEE 404 requires the completed joint to withstand heat-cycling at the cable's emergency overload temperature — the joint must match the cable's full thermal and dielectric performance, not merely connect the conductors.
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Two-cable scope
IEEE 404 covers joints connecting two cables. Joints that connect more than two cables, or cables of two different conductor sizes, fall outside the standard and are specified case by case.
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Companion accessories
A joint restores the run; the cable ends elsewhere are finished with terminations under IEEE 48, and deadfront connections use separable connectors under IEEE 386.
Splice types.
Cold-shrink
Pre-expanded elastomeric splice bodies held open by a removable core. As the core is withdrawn the body recovers evenly and void-free onto the joined cable — no open flame, faster installs, preferred in hazardous or confined locations.
Heat-shrink
Insulating and shielding tubing recovered onto the joined cable with a torch or hot-air gun. A long-proven approach that rebuilds the cable's insulation and shield layers and seals the joint against moisture for indoor, outdoor, and buried service.
Pre-molded
Factory-molded one-piece rubber joint bodies slid over the prepared splice, with stress control and shielding built into the molding. A consistent, repeatable interface for crews that prefer a slip-on body over field-recovered tubing.
Inline joints
The standard joint connecting two lengths of the same shielded cable into a continuous run — restoring the conductor connection, insulation, insulation shield, and metallic shield across the splice, matched to the cable construction.
Transition joints
Joints that connect dissimilar cables — for example extruded-dielectric to paper-insulated lead-covered (PILC) cable — reconciling two different insulation and shield systems across a single qualified connection.
Separable 600A splices
Splice bodies built to the deadbreak interface so a joined run can be opened at the splice without cutting the cable — combining a permanent joint with a separable, re-enterable 600A connection point.
FAQ.
What is a medium-voltage cable splice?
A medium-voltage cable splice, or joint, permanently connects two lengths of shielded power cable into a continuous, fully insulated and shielded run. It restores the conductor connection, insulation, insulation shield, and metallic shield across the joint.
Joints for extruded and laminated dielectric shielded cable are governed by IEEE 404.
What is the difference between cold-shrink, heat-shrink, and pre-molded splices?
Cold-shrink splices are factory pre-expanded over a removable core and recover onto the cable without flame when the core is withdrawn.
Heat-shrink splices use a torch or hot-air gun to recover insulating and shielding tubing onto the cable. Pre-molded splices are factory-molded one-piece rubber bodies slid over the prepared splice, with stress control built into the molding.
What standard applies to medium-voltage cable splices?
IEEE 404 is the standard for cable joints used with extruded and laminated dielectric shielded cable, rated in preferred voltage steps from 2.5 kV through 500 kV.
It defines electrical ratings and test requirements, including heat-cycling at the cable's emergency overload temperature, and covers joint jacket-seal and metallic-shield devices.
What is the difference between an inline and a transition splice?
An inline splice joins two lengths of the same shielded cable into a continuous run.
A transition splice connects dissimilar cables — for example extruded-dielectric cable to paper-insulated lead-covered (PILC) cable — reconciling two different insulation and shield systems across one qualified joint.
Which manufacturers does Hawk carry for splices?
Hawk carries medium-voltage cable splice products from 3M, TE Connectivity, Raychem, and Elastimold.
Does Hawk publish splice pricing or lead times?
No. Cable splices are priced per project.
Send the voltage class, cable size and construction, splice type, and installation environment through Contact — pricing and availability are confirmed once those are defined.
Sourcing cable splices?
Send the voltage class, the conductor size and insulation construction of each cable, the splice type, and whether the joint is inline or a transition — Hawk MV Supply will fill in the rest.
Medium-voltage cable splices across the 5kV–35kV class.
Hawk MV Supply sources medium-voltage cable splices for the full 5kV through 35kV class — cold-shrink, heat-shrink, and pre-molded one-piece joints for shielded cable, in inline and transition configurations, including separable 600A splices. A splice, or joint, permanently connects two lengths of shielded power cable into a continuous run, restoring the conductor connection, insulation, insulation shield, and metallic shield across the joint. Splices for extruded and laminated dielectric shielded cable are governed by IEEE 404, which sets electrical ratings and test requirements — including heat-cycling at the cable's emergency overload temperature — and covers joints connecting two cables. A splice is specified by voltage class, conductor size range, cable insulation construction, installation technology, and indoor, outdoor, or buried service; exact values are confirmed per project.
Cable splices are used wherever a shielded medium-voltage run must be extended, repaired, or transitioned between cable types — in utility underground distribution, industrial plant feeders, renewable collector systems, data center power runs, and infrastructure projects. The splice is the point in the run that must match the cable's full voltage and shielding performance; cable ends elsewhere are finished with terminations and deadfront points with separable connectors. Hawk carries splice products from 3M, TE Connectivity, Raychem, and Elastimold. Brand names and logos are the property of their respective owners; specifications shown are typical industry ranges, with product availability and exact values confirmed at quote.