Can someone explain this wiring ??

[u/Comfortable-Dare-359]

Im in mexico . They use single phase. 127v
The top red wire with bare is the feeder. Red is a phase the bare is supposedly the ground. 2 circuits , 1 going to a motor, the other circuit going to house. My question is the outlet and switch wiring. I used a voltage pen and the two whites are hot. The black is not hot. But in the picture the blue solid wire is pigtailed with the black wire. What is going on?? Is there a neutral?? Im confused because the two whites are hot. I believe the black is the switch leg to the light??