How to tell if your AC wiring needs an upgrade

BTW, the voltage drop calculators are great. I have no problem with them. The reason I am recommending measuring the neutral is that the calculator doesn’t actually take into account any actual problems inside your house.

If yo know you have 12 gauge wire, and you know it is 45’ long and that your audio system consumes a certain amount of power the voltage drop calculator will give you the best case scenario, but your home may not be best case ... 🤣

Nothing wrong with looking at the calculator and measuring the neutral before you decide what your needs are.

 

The final 0.4V reading could be nothing more an induced voltage by the HOT 120V ungrounded conductor.

I suspect the 0.9V was not correct and was influenced by noise pickup. The 0.4 is likely the accurate measure.

@erik_squires understood your meaning now.  You are using the ground-neutral voltage as a crude ammeter.