초록 ▼

A heating element construction for a mesh mat used in an underfloor heating system. The heating element includes a heater wire having one or more conductors spirally wound around a center strand and an insulating jacket surrounding the conductor. The heater wire is doubled back on itself to provide

A heating element construction for a mesh mat used in an underfloor heating system. The heating element includes a heater wire having one or more conductors spirally wound around a center strand and an insulating jacket surrounding the conductor. The heater wire is doubled back on itself to provide two counterflow portions which are spirally wrapped around each other. The electric current flows in opposite directions in the two counterflow portions to cancel the electromagnetic field. A braided metal ground shield surrounds the heater wire. A protective outer cover surrounding the ground shield resists abrasion and water.

대표청구항 ▼

[ Having thus described the invention, what is claimed is:] [1.]1. A heating element for a mesh mat in an electric floor warming system, comprising:a heater wire including a continuous conductor for emitting heat when energized by electric current and an insulating jacket surrounding said conductor,

[ Having thus described the invention, what is claimed is:] [1.]1. A heating element for a mesh mat in an electric floor warming system, comprising:a heater wire including a continuous conductor for emitting heat when energized by electric current and an insulating jacket surrounding said conductor, said heater wire being doubled back on itself to arrange counterflow portions thereof in proximity to one another with current flowing in opposite directions in the conductors of the counterflow portions;a metal shield surrounding said counterflow portions of the heater wire, said shield being adapted for electrical grounding to provide a ground shield; andan insulated cover surrounding said shield.