Let's look here in the 2002 NECH:
www.nfpa.org "300.8 Installation of Conductors with Other Systems.
Raceways or cable trays containing electric conductors shall not contain any pipe, tube, or equal for steam, water, air, gas, drainage, or any service other than electrical.
This section specifically prohibits installation of an electrical conductor in a raceway or cable tray that includes a drain, water, oil, air, or similar pipe."
My comments: On the other hand, many will accept a separate suitable raceway in the wireway so that the separation can be achieved.
The passing through wireways with a electrical conduit is not uncommon.
