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Electrical Connections

18001 Sheldon Road
Middleburg Hts., OH 44130
Phone: +

EGS Electrical Penetration Assemblies

Electrical Penetration Assemblies (EPAs) transfer electrical power and signals through the containment wall and ensure the containment pressure boundary is maintained during design basis accident conditions. This dual function, as a safety-related electrical and mechanical device, makes the EPA an unique nuclear component.

EPAs are configured with individual feedthrough modules that are mounted to a bulkhead flange, header plate, or canister. Feedthrough modules are constructed with electrical conductors to pass electrical signals or power, insulators, and seals in a stainless steel housing. Feedthrough modules and the bulkhead flange aperture are supplied with double redundant seals and internal nitrogen gas containment space for leakage monitoring.


  • Annunciator Panels
  • Fire Protection Panels
  • Sampling Panels
  • Electrical Control Panels
  • Instrument Panels
  • HVAC Control Panels
  • Custom Cabinets and Racks
  • Electrical Distribution Panels
  • Process Flow/Control Panels

Design Features

  • Feedthrough modules with integral lead wires
  • Flanges, canisters, or header plates Junction Boxes (both inboard and outboard)
  • N2 pressure gauge and shut off valve

Qualification Levels

  • Qualified life: 60 years
  • Thermal Aging
  • Radiation
  • Seismic
  • Thermal Cycling
  • High Current Testing
  • Flooding and Severe Accident

Qualification Standards

  • ASME NPT Certification
  • IEEE 317-1983/2013
  • IEEE 323-1974/1983/2003
  • IEEE 344-1975/1987/2004
  • KBE EP-146
  • KBE EP-154
  • Equivalent to RCC-E, K1
  • 10CFR50/Appendix B
  • 10CFR21
  • NQA-1
  • ISO 9001