Tom,
can I cheat ???..........
A lev # HCS10-1SW & HCC10-1SW can operate as a 3-way with the same H & N at either end, maintaining the constant H & N for the garage interior & recptacles. [Linked Image] [Linked Image] [Linked Image] so i can do it in 2 wires ( given a mettalic EGC raceway) [Linked Image]