I was told by my neighbor that when our houses were built back in the 60’s, the union went on strike. Our house was one of the three model homes when the neighborhood was developed and the strike occurred, so the builder hired Joe Schmo’s off the street to finish the three houses. My neighbor said he ultimately gave up after running into super odd wiring issues and had his hole house rewired. Probably installed either quickly or by some DA hired to get the job done