I have come across a sub panel/ 50 amp/ 220 .It is for a garage, very small. When I put the tester on the legs, (leg to ground, 110/ other leg to ground, 110, both together, 220) everty thing seems normal. but, I wired plugs off a 20 amp breaker from this box and they are showing me I have 110, but they will not work?I checked from plug, hot to neutral, 110, and hot to ground, 110? I am lost? Any help?