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230.7 Other Conductors in Raceway or Cable
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Conductors other than service conductors shall not be installed in the same service raceway or service cable in which the service conductors are installed.
Exception No. 1: Grounding electrode conductors or supply side bonding jumpers or conductors shall be permitted within service raceways.
Exception No. 2: Load management control conductors having overcurrent protection shall be permitted within service raceways.