Article 21 - Machinery and Equipment for Electric Elevators
- Section 3121.0 - Car and Counterweight Guide Rails, Guide-Rail Supports and Fastenings
- Section 3121.1 - Buffers and Bumpers
- Section 3121.2 - Counterweights
- Section 3121.3 - Car Frames and Platforms
- Section 3121.4 - Car Enclosures, Car Doors and Gates, and Car Illumination
- Section 3121.5 - Car and Counterweight Safeties
- Section 3121.6 - Speed Governors
- Section 3121.7 - Capacity and Loading
- Section 3121.8 - Driving Machines and Sheaves
- Section 3121.9 - Terminal Stopping Devices
- Section 3121.10 - Operating Devices and Control Equipment
- Section 3121.11 - Emergency Operation and Signaling Devices
- Section 3121.12 - Suspension Ropes and Their Connections
- Section 3121.13 - Welding
- Section 3121.14 - Layout Data