The OP doesn't give us enough information. If this relay is large enough it certainly will have a vibration if and when it its energized. Don't know if this is something that needs grounding either. This is pig work when they start installing equipment this way and I'm just the guy to use 110.12 and let them prove me wrong. I guess I better apologize for my standards but the NFPA 70 and NFPA 72 and the JIC Standards are minimum in my life.
Last edited by George Little; 07/23/10 06:50 PM.
