Can anyone tell me what NEC code article or IEEE std. spells out the requirements for earth grounding on industrial control panels? We are in the plastics extrusion business and have many machines that operate on 3 phase 480 power. All of out thermoformers, trim presses and pelletizers come from the OEM with the equipment grounding conductors installed and sized according to NEC specs in article 250. However, I seem to be having a problem when it comes to specific requirements regarding the grounded electrode system. The power comes into each machine from overhead busway fed from 3000 amp switchboard. Do I need a ground rod on each of the machine control panels? Inside the panels are relays, contactors, PLC equipment, motion controllers, power supplies, etc... Any guidance is greatly appreciated.
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