I had always Thought that either cable could be used in underground conduit because both have conductors that are listed for wet locations. The restriction that I was aware of was that one could not use type USE above ground or in structures because it lacked a fire Retardant outer cover. Have I had this wrong all these years?
338.2 Definitions.
Service-Entrance Cable. A single conductor or multiconductor assembly provided with or without an overall covering, primarily used for services, and of the following types:
Type SE. Service-entrance cable having a flame-retardant, moisture-resistant covering.
Type USE. Service-entrance cable, identified for underground use, having a moisture-resistant covering, but not required to have a flame-retardant covering.
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Tom
