Q: I’d like to replace a 2-prong receptacle with a 3-prong receptacle but was told I could only do this if the outlet box was grounded so that I could ground the new receptacle. How can I tell if the box is grounded?
A: To check for ground, insert one prong of a circuit tester into the shorter slot (the “hot” one) of the outlet. Touch the other to one of the screws securing the plastic cover plate. The tester should light up to indicate a proper ground. If the box is not grounded, then you need to consult an electrician to make the change to a 3-prong receptacle.