A cold tail in underfloor heating refers to the specific section of the heating mat or cable that does not produce heat. Its primary purpose is to serve as the non-heating electrical connection that links the heated portion of the system to the main power supply, typically via a thermostat or a junction box.
Understanding the Purpose of a Cold Tail
The design of underfloor heating systems requires a safe and effective way to connect the heating elements to the household's electrical system. Since the heating cables themselves get hot, directly connecting them to the electrical supply can pose risks and make installation difficult. This is where the cold tail becomes essential:
- Safe Electrical Connection: It provides a cool, insulated conduit for electrical current from the power source to the heated elements without contributing to the floor's temperature. This ensures that sensitive components like thermostats and junction boxes are not exposed to high temperatures.
- Installation Flexibility: The cold tail allows the heated part of the cable or mat to be precisely laid within the floor area where heat is desired, while the non-heating part can be routed through walls or conduits to the control unit. This simplifies the installation process and prevents unnecessary heating in areas like cupboards or under permanent fixtures.
Construction of a Cold Tail
A cold tail is robustly constructed to safely carry electricity. It typically consists of three distinct electrical elements encased in a durable, often black, outer sheath. These elements correspond to standard household electrical wiring:
| Element | Color | Function |
|---|---|---|
| Live | Brown (or Red) | Carries the active electrical current. |
| Neutral | Blue (or Black) | Provides the return path for the electrical current. |
| Earth | Yellow and Green | A safety wire designed to prevent electric shock. |
This standard construction ensures compatibility with electrical codes and simplifies connection by qualified electricians.
Importance in Underfloor Heating Systems
The cold tail is a critical, yet often overlooked, component in any electric underfloor heating installation. It ensures the system operates safely, efficiently, and effectively by:
- Preventing Overheating: Keeps the electrical connection points cool, protecting wiring and control units from heat damage.
- Simplifying Wiring: Allows installers to easily run the non-heating cable to the designated thermostat or junction box location.
- Enhancing Durability: Designed to withstand the rigors of installation and long-term use without degradation from heat.
In essence, the cold tail acts as the vital bridge between the power supply and the floor's warmth, guaranteeing both performance and safety for your underfloor heating system.
