Hi guys:
I'm not an electrical contractor, but the concept of "you fetch, I install" bothers me for two reasons; 1)The quality of some items sold at the big orange or big blue stores leaves a lot to be desired - which means that Mr. Pennypincher will usually purchase the lowest quality items for the EC to install (sacrificing safety and durability along the way), and 2)Some items may not be suitable for use together in every instance.
This is where the EC's experience kicks in. He (or she) knows from experience what components work well together and which ones don't. If you are going to hire an EC to do the work for you in a professional manner, allow him to do the WHOLE job.
Just my thinkin'...
Mike (mamills)
