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	Subject - Do I have to ground an exit sign system? unsaint34 I have 277/480 Y at work and I need to hook up an exit sign that uses 25V. So, I am planning to use a transformer, I assume 277/25V transformer. I looked up the code book which said, I need to ground a system if it is less than 50V, and if it is fed by a supply system of more than 150V. But, how do I system ground the secondary side, which is the exit sign? Run a grounding wire to concrete? Even if I did that, what do I connect it to? All the electrodes, the building metal structure, and water pipes are being used as electrodes for the building. Am I wrong about the code? Jon skynrd If you have 480v it better be in conduit which should be bonded at the souce and carry the ground to the enclosure you mount the 480v control transformer preferably a Hoffman box with a hinged cover. 24v control transformers are dual voltage single phase primaries 240/480v for 480v you jump H2 & H3 connect one hot to H1 & another hot to H4 usually check the plate, the hots are opposite phases and if you don't know that stop right now and call an electrician. Anyway the secondary will have a hot & a neutral bond the neutral to the metal on the box. Lenny lucky1122 Can I say something here? Why do you need to hook up a transformer to feed a single exit sign . Couldnt you just buy a universal voltage LED exit sign which comes factory wired for either 277 or 120volts. Then you just select the correct wire for the voltage and be done with it. By the way, you must know that exit signs are always tied into a generator(unless there is none available in which case they must be battery back up)so that they stay on during outtages from power failure. I dont feel as though I have enough of a feel for what your trying to do to address it further.