Birchy Posted September 5, 2008 Report Share Posted September 5, 2008 I'm trying to do a DIY energy audit of a large church, where I work as a maintenance tech. (mostly in controls). I've been trying to conduct an energy audit, so I can pie chart how much energy is being used by the various circuits/equipment/appliances. I was going to try shutting down all but one circuit on a holiday or at night and take readings off the power meter, but it doesn't seem to display actual current usage, and working off the accumulated usage is impractical. So... Plan B is to amp/clamp the circuits at the switches and breakers. I started playing with that yesterday, starting with the equipment that I most need data on, one of our large chillers. The switch has three 3-phase (480v, I assume) cables/circuits passing through it, the legs of which circuit bundled and connected together to the three switch terminals. So I amp clamp the only wire that I can get the clamp around and read almost 30 amps. Assuming that I'm able to get an amperage reading from the other wires, what formula can I use to calculate watts? Do I just use the 30A in a standard power equation (V*A=W), do first I sum the amps of the 3 legs, do I apply a formula to the 3 amp values to get some "effective equivalent" to plug into the power formula? If it's not that easy, is there a way to do it without hiring a consultant? Link to comment Share on other sites More sharing options...
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