I was told (in person) by Jerry Daniel of the Electrical compliance of the State of Texas. That I could not sell, offer to sell, or advertise that I sell electrical signs without a Electrical Sign Contractors license or a electrical contractors license..
Also was told that it is against code to install replacement pan or flat faces in a sign without the contractors license. The reason for this was that when you removed the face it was like opening and electrical enclosure and you were be exposed to the electrical components..
Was also told on the phone that I could be fined for removing and old channel letter sign from a building that no electricity (no meter) for over a year.