Is electrical conduit measured by ID or OD?

Is electrical conduit measured by ID or OD? Is conduit measured by ID or OD? The ID and OD How do you measure electrical conduit size? Tubing is measured by the OUTSIDE DIAMETER (O. D. ), specified in inches (e. g. , 1. 250) or fraction of an inch (eg. 1-1/4″). Pipe is usually measured … Continue reading Is electrical conduit measured by ID or OD?