What must be marked on a conduit body before it can contain a splice?

For a conduit body to be used for splicing, it is crucial that its volume be clearly marked. This requirement ensures that the conduit body can accommodate the conductors and any splices or connections within it without violating space requirements set by electrical codes. Properly marking the volume informs installers about the maximum amount of conductors that can be safely contained, thereby promoting safety and adherence to code specifications. This marking helps prevent overcrowding and potential hazards, as exceeding the volume limits can lead to overheating and electrical failures.

While the name of the manufacturer, the type of conductor, and the date of installation may be relevant information for other aspects of electrical installation and maintenance, they do not directly pertain to the regulations governing the proper use and capacity of conduit bodies regarding splices.