re: Dimming lights when I run power tools

quote:

---

The problem is that the lights even dim for a second when I use my 7.5A angle grinder from an outlet in the front of my house. I can also make it happen when I use a 10A heat gun or hair dryer from an interior outlet. Just barely dims when my AC kicks on.

---

Then you're having voltage sag issues at both panels. Probably correct in your assessment that the power line coming to the house is too small. The XFMR tap thing would still work though if the XFMR has movable taps. Otherwise it's probably a wire size thing, but the XFMR could be undersized. Need to get the XFMR size and a load check on your incomer to be sure though.