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Underground medium voltage power cable may have copper or aluminum conductors with a thin layer of semiconducting crosslinked polyolefin followed by a tree-retardant crosslinked polyolefin insulation and a strippable semiconducting crosslinked polyolefin insulation shield. Depending on the cable's application, it may have a metallic shielding, armour or sheath and an overall jacket. Underground primary cables can be directly buried, pulled into underground ducts, submerged under water or hung from an overhead messenger wire. They are robust, easy to install and readily available in most conductor sizes and voltages from 5 to 46 kV.
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