These requirements cover the following elevator appliances intended for installation and operation in accordance with the requirements of the Safety Code for Elevators and Escalators@ ASME A17.1:a) Hoistway-Door Interlocks@b) Hoistway-Door Combination Mechanical Lock and Electrical Contacts@ andc) Hoistway-Door and Car-Door or Gate Electrical Contacts.These requirements are intended to supplement and be used in conjunction with the Safety Code for Elevators and Escalators@ ASME A17.1.These requirements do not cover elevator appliances rated more than 600 volts.