(a) A belted cable with three phase conductors in a single sheath. (b) A Höchstädter type cable where each conductor has its own sheath. The diagram shows a snapshot of the equipotential lines in the insulating material inside the sheath, with the top phase at peak positive voltage and the other phases at half the negative peak. In the case of the belted cable, the electric field puts a higher demand on the insulation material. Belted cables are used only for the lower voltage ranges.
Source: Electrical Power System Essentials, P. Schavemaker and L. van der Sluis.
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