Electrical heating cable with indicator light and manual test device

Claim 1

An electrical heating cable assembly comprising: a relatively thin, flexible heating cable including an elongated electrically conductive resistance heating element embedded in an elongated flexible insulator; a thermostat electrically connected adjacent said heating element for controlling energization of the latter and having at least one exposed terminal; visual indicating means comprising a small indicator light enclosed within a substantially translucent indicator envelope, said visual indicating means being electrically connected to said thermostat and heating element and operable on closing of said thermostat for indicating energization of said heating element; a test device electrically connected in parallel with said thermostat and operable manually to energize temporarily said heating element and indicating means, and a substantially translucent envelope disposed about said thermostat and test device, said test device comprising a movable metal conductor electrically connected at one end with one side of said thermostat and having its other end disposed adjacent said exposed terminal, said other end of said conductor being normally spaced from said exposed terminal to open a circuit parallel with said thermostat, and said other end of said conductor being urged into contact with said exposed terminal to complete said parallel circuit on the application of manual pressure to an intermediate portion of the conductor via said translucent envelope.