500 Ω-m—Low Enough Resistivity for a Cable Ground Shield Semicon?

In modern distribution cables, the stress control layers extruded over the conductor and insulation play a critical role in protecting the insulation from stress enhancements caused by the conductor, shield wires or tapes, etc. The requirements for the conductor and ground shield stress control layers differ somewhat based on their differing environment. The conductor stress control layer is in the highest temperature region of the cable and, if resistive, must have stable resistivity as a function of time and temperature. The ground shield semicon is in a lower temperature region of the cable but may not be in intimate contact with the neutral wires, especially for an unjacketed cable.