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They may or may not be required by code depending on the size of the column, but they're usually a good idea.
Landings or platforms that are large enough to accommodate a couple of chairs probably now need to have an electrical outlet too
Why is an air space required around Type B vent pipe passing through a drywall ceiling insulated with fiberglass batts?
The NEC requires at least one outlet in hallways that are 10 feet or more in length; problem is, it doesn't define what constitutes a hallway.
Why it's okay to install Romex in an HVAC or chimney chase, but not in ductwork.