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	Subject - how do I ground a 25V circuit? 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 lctrc789 If you have 150 volts or less to ground in a small transformer you do not need a ground, however in this case the have primary side at 277 and the code states that over 150 must be. You say the exit sign is secondary is ungrounded, can you not ground to the steel in this case to ground the sign? GalwayElectric It's my impression that you would just ground the secondary side of the 277/25 volt transformer and run a ground from there to your exit sign with in your current carrying conductors? Isn't this the way to do it. unsaint34 by "run a ground" you mean ... make a separate electrode for the secondary? (if so, I don't know how) Or connect to the primary (supplied system) side equipment grounding?