Operation & Safety
Landing Doors & Interlocks
Interlocks are required by the ASME A17.1 / CSA B44 Safety Standard to be certified by a Nationally Recognized Testing Laboratory (NRTL) and must bear the mark of one of these organizations somewhere on the interlock. You can verify that your interlocks are certified by checking for these marks or have your elevator contractor show you where they are marked. These symbols are some of the marks to look for of the more common NRTL’s who are authorized to certify interlocks for private residence elevators.
