Conduit bodies that are durably and legibly marked by the manufacturer must indicate what to contain splices, taps, or devices?

Conduit bodies that are marked durably and legibly by the manufacturer must indicate their volume. This is crucial information because the volume of the conduit body is essential for ensuring compliance with the National Electrical Code regarding the proper amount of space available for conductors, splices, taps, or devices within the conduit system.

When installing electrical systems, it is important to adhere to specific volume allowances to prevent overcrowding, which could lead to overheating or potential failures. The NEC sets forth requirements for box and conduit body volumes to ensure that sufficient space is available for wiring and connection points.

While size, weight, and shape may be relevant to the conduit body's physical characteristics or its ability to fit in certain installations, they do not directly address the critical need to ensure adequate capacity for safe electrical connections. Thus, marking the volume helps installers and electricians to make informed decisions about the appropriate uses of the conduit bodies in their installations.