service provider so a visit could be arranged. Safety To satisfy safety codes stair lifts usually have cut-out switches connected to "safety edges" and other protective devices so the drive power is disconnected if something goes wrong. Modern lifts have a high degree of comfort, but safety is always paramount. "Safety edges" are a common feature to the power pack and footplate. "Safety edges" ensure that if there is any obstruction on the stairs the stair lift will automatically stop and only travel away from the obstruction. Stair lifts are used by people of all ages and child car seats can usually be fixed a standard stair lift seat using the seat belt provided with the stair lift system. Many stair lifts are also fitted with a key, to allow the user to prevent others from using the lift. Codes of practice and technical specifications apply to stair lift manufacture. In North America these codes may be relevant: ASME A17.1 - 1990, Safety Code for Elevators and Escalators ASME A18.1 - 2005 Safety Standard for Platform Lifts and Stairway Chairlifts Produced by American Society of Mechanical Engineers An important specification used by stair lift manufacturers in Europe was British Standard BS 5776: 1996 Specification For Powered Stair lifts, produced by The British Standards Institution. It has since been replaced by BS EN 81-22:2021: Safety rules for the construction and installation of lifts.''' Note: codes of practice and technical specifications are updated occasionally. These references may be out of date by the time they are read and are shown as examples. Self-installation Today, self-installation of stair lifts is becoming a common trend for people interested in DIY projects. Stair lifts are available for purchase that can be self-installed. Professionals within the home medical equipment industry do not recommend that people attempt to install these products themselves. They believe that in terms of warranty, long-term care, and service, it is much more economical to have a trained professional install these products. In addition, these professionals are also aware of all safety measures and concerns associated with the proper installation of stair lifts, as well as the applicable local elevator codes. Travel speed Stair lifts normally have "soft" starts so the user is not jerked as the carriage starts to move. Typical travel speed for domestic straight rail stair lift carriages range between and (0.34 miles per hour). The speed of curved rail