Concentric cables — also called concentric neutral or concentric service cables — are the standard solution for underground service connections between a distribution transformer or pillar and the customer’s meter. Unlike conventional power cables that route the neutral as a separate insulated core, a concentric cable wraps the neutral conductor as a helical layer of bare wires around the insulated phase core, so the neutral doubles as a protective earth and gives the cable a continuous metallic envelope for fault-current return. The construction is compact, mechanically tough, and well suited for direct burial or duct installation in wet and dry environments alike, which is why it is so widely specified by distribution utilities and EPC contractors for residential and commercial service drops.
At ZD Cable we manufacture concentric neutral cables rated 0.6/1 kV in two conductor options: our Aluminum Concentric Neutral Cable uses a stranded AA-8000 series aluminum alloy phase conductor, and our Copper Concentric Neutral Cable uses a Class 2 stranded copper phase conductor. Both share the same overall build — XLPE insulation, a non-hygroscopic separator tape, a copper concentric neutral applied as a helical layer, and a PVC outer sheath — and both are produced and type-tested to KS 04-1022 and PIESA 1062, the two service-cable standards most commonly specified by distribution utilities across Asia and Latin America. Conductors are stranded to IEC 60228, so the cable’s electrical sizing stays consistent with the rest of the LV network it connects to.
