What is blue wire on thermostat UK?
Red – Live. Yellow – Neutral. Blue – Neutral. Green/Yellow – Earth.
What is the blue wire for on a thermostat?
The Blue or C Wire C wires or varying colors apply to every thermostat, but blue C wires belong to thermostats attached to a heat pump. Blue wires are for heat pumps. This wire connects to terminal B on your thermostat.
Where does the blue wire go on a 4 wire thermostat?
Here are the wires in 4 wire thermostats with terminal codes and color codes:
- Red wire for power (24V).
- White wire for heating (connected to W or W1 terminal).
- Green wire for fans.
- Blue or yellow wire for cooling (connected to Y).
Where does blue wire go on Nest thermostat?
If your thermostat doesn’t have a separate connector labeled C and you’re not sure what type of system you have:
- A brown wire is mostly likely a heat pump wire and should be connected to the O/B connector on the Nest thermostat.
- If the B wire is blue, it should most likely be connected to the C connector.
What Colour is neutral wire on thermostat?
| Traditional Thermostat Wire Color Codes | ||
|---|---|---|
| Color | Terminal | Details |
| Black / Blue | C | “Neutral” side of transformer or L2 |
| Red | R or V | “Hot” side of transformer or L1 |
| Red | Rh or 4 | Turn on heater |
What does the blue wire mean?
Blue and yellow wires are most commonly found in commercial buildings and are used as the live wires pulled through a conduit. Yellow wires are used as switch legs to ceiling fans, structural lights, and outlets paired with light switches, while blue wires are usually used as travelers for three-or-four-way switches.
Where does the blue wire go nest?
A brown wire is mostly likely a heat pump wire and should be connected to the O/B connector on the Nest thermostat. If the B wire is blue, it should most likely be connected to the C connector.
Where does the blue wire go?
The blue wire from the ceiling fan gets connected to the second live wire from the ceiling. This second wire can vary in color but is most commonly red or black. This connection allows you to power your lights from the second switch. Connect the white grounded wire from the ceiling to the white wire from the fan.
What is a blue wire?
Is Blue a live wire?
Plug wiring colours
| Wire | Colour |
|---|---|
| Live | Brown |
| Neutral | Blue |
| Earth | Yellow and Green |