Cable installation in trays NEC1/26/2024 It is important to know that shutting off the service disconnect will not de-energize all conductors in the cable tray. If a cable tray is in fact used to support service entrance conductors, labels are required on the cable tray so that the servicing electrician is aware that unprotected, unfused service entrance conductors are located on the cable tray. Most of the time, cable trays do not contain service entrance conductors because cable trays are generally installed downstream of the service disconnect. Because of this, it’s not very often that cable trays are used to support service entrance conductors. Service entrance conductors are required by 230.70(A)(1) to be disconnected at or nearest the point where the conductors enter a building. Code Change Summary: New code language was added in Part III of Article 230 to specify how far apart the hazard labels must be placed to identify cable trays containing service entrance conductors.
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