Installation and Maintenance Practices
What this domain tests
This domain covers how equipment is installed, adjusted, inspected, lubricated, and recorded. Expect items on rigging and scaffolding, guide-rail alignment, rope installation and equalization, door adjustment, the written Maintenance Control Program (MCP), periodic tests, and rope retirement criteria.
Core practices
- Installation sequence: survey and plumb the hoistway, set guide rails and brackets, align the machine, install roping, equalize rope tension, then adjust doors and leveling.
- Maintenance Control Program (MCP): ASME A17.1/CSA B44 requires a written MCP listing procedures and frequencies, with records available to the inspector. Maintenance must be performed by competent personnel.
- Periodic tests: Category 1 tests are performed annually; Category 5 tests every five years, generally with rated load and at rated speed, and are typically witnessed.
- Rope inspection: retirement criteria include broken-wire counts, such as 12 randomly distributed broken wires within any 6d length, or 4 broken wires in one strand within one lay length. Also check diameter loss, corrosion, and broken strands.
- Lubrication and adjustment: follow the manufacturer's schedule; over-lubricating rails or ropes can cause slipping or buildup.
Worked example
During a maintenance visit, a traction rope shows 13 randomly distributed broken wires within a 6d length; the same rope shows 2 broken wires in one strand within one lay. The random-wire count exceeds the 12-wire criterion, so the rope must be replaced regardless of the strand count being below 4. Reasoning matters: either criterion failing is sufficient for retirement, and the rope should be replaced as a set with tension equalized afterward.
Traps that cost marks
- Re-roping without equalizing tension, causing rapid wear on the slack rope.
- Returning an elevator to service after a repair without the required test and documentation.
- Relying on memory instead of the written MCP and record log.
- Adjusting a brake without checking stopping distance and pick-up.
- Treating visible rope wear as the only retirement trigger and ignoring broken-wire counts.
Documentation
Inspection findings, repairs, and tests belong in the maintenance record. Code questions often ask what must be recorded, not just what must be fixed.