UL 2557 OUTLINE
OUTLINE OF INVESTIGATION FOR MEMBRANE SWITCHES
|Publication Date:||28 May 2008|
These requirements apply to membrane switches actuated by human activity, via a membrane or sensing substrate, to operate or control appliances and electrical equipment. The membrane switch electrical rating not to exceed 30 Vrms and power not greater than 100 VA.
When this outline references "switches" it shall mean "membrane switches" unless specifically indicated.
Membrane switches which incorporate additional control functions governed by the switch function are within the scope of these requirements. Additional control functions shall be evaluated for their suitability using the applicable standards for the application.
These membrane switches are intended to be operated by a person, via a membrane or by actuating a sensing substrate.
These requirements cover the indirect actuation of the switch when the operation of the actuating member or sensing unit is provided by a remote control or a part of an appliance or equipment such as a door.
Embedded components are evaluated with regards to their safety and application to the membrane switch construction. The acceptability of an embedded component in the membrane switch shall be considered with regards to construction and performance requirements in the end product final application.