Testing your grounding is not so difficult or dangerous as expected. If you know the correct wiring of your wallmount points and you know what yiu are doing... - disclaimer: I'm not responsible for toasted multitesters, fingers, young adolescents and other stuff that burns and smells bad - Normaly your ground wire is properly attached and indicated, you should test the ohm value on that wire, it should be as low as possible, this means that electrical conduct is better than the other wires, in this case your grounding will act as a safety guard, if it has a high resistance it will not work. Normally if you test your electricity outlet you should get power between the phase and neutral wire. To reach more stability for high precision stuff like Mark Levinson amplifiers for HiFi music or other very very expensive gear even this neutral / phase thing is important. There exist a lot of sites that explain proper power testing. http://www.metermantesttools.com/how...ec_outlets.pdf

surge protection: http://www.cgemc.com/Member_Serv/Mai...Protection.htm