Migration of fluids through a wiring system

The National Electrical Code (NEC) and the Canadian Electrical Code (CEC) contain the sealing requirements to prevent the migration of flammable fluids from traveling through wiring systems to nonhazardous locations, This article reviews the need for the intent and application of these code requirements. Case studies of incidents are discussed to demonstrate that significant hazards exist and how these are effectively mitigated by the requirements of these codes.