You are correct the only places that Article 700"Emergency Power" and "Normal Power" can occupy the same enclosure is when it has to, like at the transfer switch, or a light fixture that uses both sources of power, the EEs often split feed drop in fixture so only half is from generator.
Another spot we might have the two systems in the same enclosure is for relays that override wall switches for emergency lighting, if you put required emergency lighting on a wall switch you must provide automatic override during a power failure. 700.17
As far as raceways I can not think of anytime mixing the systems would be allowed.
I just noticed you mentioned receptacles, be careful with this as you can not have convenience outlets connected to Article 700 systems, they would need a second transfer switch fed from a second breaker on the generator or a separate generator, and then separate panels and circuits.
It gets costly very fast for just some outlets.
Read the scope of 700, 701 and 702 and you can get a feel for what can be on each system.
We build a lot of stores for a super market chain, we typical install one large generator that will run 700,701,702 loads if the large one drops out a small one picks up just the 700 loads.
[This message has been edited by iwire (edited 03-15-2003).]
Construction & Maintenance Electrician