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230.41 Insulation of Service-Entrance Conductors
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Service-entrance conductors entering or on the exterior of buildings or other structures shall be insulated.
Exception: A grounded conductor shall be permitted to be uninsulated as follows:
- Bare copper used in a raceway or part of a service cable assembly
- Bare copper for direct burial where bare copper is approved for the soil conditions
- Bare copper for direct burial without regard to soil conditions where part of a cable assembly identified for underground use
- Aluminum or copper-clad aluminum without individual insulation or covering where part of a cable assembly or identified for underground use in a raceway, or for direct burial
- Bare conductors used in an auxiliary gutter
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