![]() Wiring for AC and DC power distribution branch circuits are color coded for identification of individual wires. It is a red wire and comes from the transformer usually located in the air handler for split systems, but you may find the transformer in the condensing unit. In some jurisdictions all wire colors are specified in legal documents. Thermostat Wiring and Wire Color Chart Thermostat Wiring Colors Code Tstat Terminal Designation: Color of Wire and Termination: R The R terminal is the power. In other jurisdictions, only a few conductor colors are so codified. In that case, local custom dictates the “optional” wire colors. IEC, AC: Most of Europe abides by IEC (International Electrotechnical Commission) wiring color codes for AC branch circuits. ![]() The older color codes in the table reflect the previous style which did not account for proper phase rotation. ![]() The protective ground wire (listed as green-yellow) is green with yellow stripe. IEC (most of Europe) AC power circuit wiring color codes Function UK, AC: The United Kingdom now follows the IEC AC wiring color codes. Table below lists these along with the obsolete domestic color codes. ![]() UK AC power circuit wiring color codes Function For adding new colored wiring to existing old colored wiring see Cook. US, AC:The US National Electrical Code only mandates white (or grey) for the neutral power conductor and bare copper, green, or green with yellow stripe for the protective ground.
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