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For IGS (Insulated Gas-Solid) cable insulation, the nominal gas pressure is specified as 25 pounds per square inch gauge. This standard is established to ensure that the insulation material can withstand the required levels of pressure for effective operation. A pressure of 25 psi gauge is optimal for maintaining the integrity of the insulation while minimizing the risk of failure in high-voltage applications.

This pressure level is designed to provide a balance between sufficient insulation quality and safety, allowing the system to function efficiently without compromising the insulation's dielectric properties. The chosen pressure ensures that any potential gas leakage does not significantly affect the performance of the cable, which is particularly crucial for underground or industrial applications where reliability is paramount.

Understanding this specification helps professionals in the electrical industry ensure compliance with safety standards and operational efficiency when selecting and installing IGS cable systems.