[rogman16]

Electrical Pros--

Having some challenges with some light switches... Main issue, one switch, we have no idea what it turns on/off... My guess is it is a secondary switch if we installed a ceiling fan out on our patio... I took some readings from the switches with the switch both on and off... I have attached those readings in the attachment... Most are normal, but a couple seem suspect (maybe not, I have no idea)...

Second, I was supposed to have pool equipment pre-wiring accomplished when they built the home... I do have a one-gang box with 12 awg which looks like it runs from a switch (right next to the trio of switches above), but there seems to be no power to the switch and/or wires in box outside... I've attached a copy of the electrical build plan for my house where it shows the switch (inside), the box (outside) and a separate pre-wire for a pool heater... There is nothing on my exterior wall that would indicate where this pre-wiring was located... Any ideas???

Thanks much,

Roger Vrooman

 

[brric]

It appears you are not reading voltages correctly. You must read from hot conductors to neutral or ground.

 

[joed]

You do not measure voltage across a switch. You measure voltage from one of the switch terminals to neutral. If a white wire is connected to the switch it is NOT a neutral.

 

[rogman16]

It appears you are not reading voltages correctly. You must read from hot conductors to neutral or ground.

You do not measure voltage across a switch. You measure voltage from one of the switch terminals to neutral. If a white wire is connected to the switch it is NOT a neutral.

Copy, thanks for the help... I have already put the switches back, and I'm in no mood to go unscrew everything again today... Maybe some night this week... Again, appreciate the help...

vr
Roger V

 

[Nickd83]

The pool heater and light pre wire probably goes directly back to your panel and not terminated. I have a circuit into my attic that was similarly done.

The photo with the 3 switches, it would make the most sense that the right switch would be for a fan, since its using two hots in the same cable, as indicated on the drawing by the two dotted lines coming from the 3 gang switch, best way to check is to take down the porch light and test it there, hot to neutral or ground as previously stated.