Applies to cable penetrations in reactor containments. Covers the engineered safety requirements to be in the design, calculation, fabrication, assembly, testing, installation and maintenance of cable penetrations. Describes the requirements for the design, construction, test and installation of electric penetration assemblies in nuclear containment structures other than the primary pressure envelope for power generating stations. Electric penetrations provide gas-tight and pressure-resistant penetration through the containment of one or more electrical circuits.