Drain wire是什麼意思

"Drain wire" is a term used in electrical engineering and construction to refer to a type of wire used in wiring systems, particularly in plumbing and HVAC (heating, ventilation, and air conditioning) applications. The term "drain wire" is often used interchangeably with "ground wire" or "earthing wire," which is used to provide a path for electrical current to flow safely to the ground in the event of an electrical fault, such as a short circuit or lightning strike.

In a wiring system, the drain wire is typically a bare copper wire or a green insulated wire that is connected to the metal parts of electrical equipment and the earth ground. This helps to prevent electrical shock and fire by providing a low-resistance path for electrical current to flow to the ground, rather than through people or through the building's structure.

Drain wires are an important component of electrical safety and are required by building codes in many jurisdictions. They are used in a variety of electrical systems, including lighting, power, and communication systems, and are particularly important in systems that involve high voltages or that are located in areas where electrical faults could cause serious damage or injury.