We are remodeling a 1920"s house that has had various electrical updates previous to our ownership. At the moment we are preparing the house for a electrical overhaul by a licensed electrician. Before doing this we want to educate ourselves. There are a mixture of 3 prong and 2 prong outlets. Testing the 3 prong outlets indicate many have an "open ground". What is an open ground and how do you fix it? Does it need to be fixed?
