Terminal Box Color Order
Colors and suggested uses are: RED for AC Control Circuits BLUE for DC Control Circuits BLACK for AC/DC Power Circuits ORANGE for Data Collection Circuits GREEN for Ground CircuitsColors and suggested uses are: RED for AC Control Circuits BLUE for DC Control Circuits BLACK for AC/DC Power Circuits ORANGE for Data Collection Circuits GREEN for Ground CircuitsThe Terminal Block Color Code refers to the standardized system of using specific colors for terminal blocks to indicate the function or purpose of the wires connected to them. This visual coding system helps electricians and technicians quickly identify different circuits, such as protective earth. Looking at some terminal blocks like the one below, why are the top level positions color coded blue while the middle ones are in grey? I understand yellow-green are for ground connections. I am guessing Blue is for DC, but can't figure out what grey is usually meant for. Reading terminal block markings sounds simple—until you're assembling a panel that must pass both UL and IEC inspections.
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