C wires or varying colors apply to every thermostat, but blue C wires belong to thermostats attached to a heat pump. That is, which should connect internally to the primary coil, the secondary coil, and coil-taps (based on the number of wires, I assume that the secondary coil is tapped). Old Australian colour code- Multiphase. Phase 3 - Phase 3 wiring should be yellow. Homeowners with geothermal heat pumps have no use for the orange wire. Blue wires are for heat pumps, like orange wires. NEC Wiring Color Codes for AC – US & Canada US – NEC AC (Single & Multi-Phase) Wiring Color Codes The mandatory colors for power wiring in National Electric Codes (NEC) are Green, Bare or Green/Yellow (Yellow Strip or band on Green) for Protective Ground “PG” and White (alternatively Grey) for Neutral Wire. (It’s important to determine that your heat pump is compatible with your thermostat before you decide.). The older color codes in the table reflect the previous style which did not account for proper phase rotation. Learn More About Aire Serv Indoor Air Quality Services, determine that your heat pump is compatible with your thermostat, Red or “Rc” wires: Industry standard for geothermal heat pumps, Rh wires: Industry standard for geothermal heat pumps. The Rh wire connects to the RH terminal on your thermostat. Ground - Ground wiring should be green, or green with a yellow stripe. The green wire connects to terminal G on your thermostat. The choice of cable colour initially depends on what type of circuit it is, and whether the voltage is AC or DC. AC and DC Power Circuits. This thermostat wire color code will help homeowners understand the anatomy of their thermostat: Make sure you know what’s happening underneath your thermostat! It terminates in your outdoor condenser for reversing valve operation from hot to cold. Blue or “C” wires. Transformer and Wire Color Standards for Tube amps. Click to expand infographic . Red or “Rc” wires: Industry standard for geothermal heat pumps. The Rh wire connects to your heating system as opposed to your cooling system. Rc wires are only for air conditioning systems or dual transformer systems. Wire color codes are different depending on the wire type you are working with, the industry your project is related to, and the area of the country you are located in. Installation wiring, also known as building wiring is for things such as the wiring behind power points and walls. Definitive descriptions of Transformer and wire color code standards for tube amps. Blue wires are also called “C” wires because they are the Common wire. The orange thermostat wire links to your heat pump, if you have one. It terminates at the air handler or furnace. The yellow wires underneath your thermostat connect to your compressor. This wire may be red without an “H” attached to it, depending on if you have a dual transformer setup. Transformer wire color codes? These are listed in Table below. The list below also outlines the different colour codes for single phase and multiphase in Australia. Rc wires connect to the RC terminals on your thermostat. If you need help installing your new thermostat, Aire Serv® is here to help you get it right. The orange wire only applies to homeowners with an air-source heat pump. The green wire underneath your thermostat connects to the fan of your furnace or air handler. This thermostat wire color code will help homeowners understand the anatomy of their thermostat: White wires. Aire Serv can help homeowners with all thermostat and HVAC needs. This wire connects to terminal B on your thermostat. Red wires, specifically Rc wires, are responsible for 24-hour volt AC power from your transformer. Control Panel Wiring Colour Codes per EN 60204–1. Call (855) 679-0011 or request an appointment online to get started. Dual transformer systems refer to a setup with a cooling and heating transformer. What connections do these wires correspond to? © 2020 Dwyer Franchising, LLC All rights reserved. Phase 1 – Red Phase 2 – White Phase 3 – Dark Blue Neutral – Black Earth – Green. Phase 2 - Phase 2 wiring should be orange. Transformer Lead Color Code: A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors — the transformer's coils or "windings". The protective ground wire (listed as green-yellow) is green with yellow stripe. The yellow wires connect to the Y terminals on your thermostat. Transformer Lead Color Code: A transformer is a device that transfers electrical energy from one circuit to another through inductively coupled conductors — the transformer's coils or "windings". Click here for our precautionary measures. These are the wire color coding standards that are used in the United States. The yellow wires terminate at your compressor contactor via an air handler. C wires are necessary for any “smart” thermostat that needs to be connected to a power source 24/7, regardless of your heat pump type. Yellow wires. Rh wires: Industry standard for geothermal heat pumps. Even there are different colour codes for AC and DC wires. Phase 1 - Phase 1 wiring should be brown. Except for air-core transformers, the conductors are commonly wound around a single iron-rich core, or around separate but magnetically-coupled cores. Orange wires. The Electrical wire color code / color codes / Electrical Wiring Color Coding Systems are always being updated. The amendments also address our local needs and practices so that the standard of electrical safety will not be compromised with this change. Green wires. Make sure you know what’s happening underneath your thermostat! The existing cable colour code for fixed electrical wiring stipulated in the Singapore Standard CP5:1998 Code of practice for electrical installations has been amended to align with international standards such as BS 7671 and IEC 60446.