Safe operation and load control
Domain 5 tests whether you can run a platform within its limits: load, balance, weather, movement and the space below.
Load and persons
- The rated load and maximum number of persons are on the nameplate and in the certificate; both limits apply at the same time.
- The load includes people, tools, materials, sealant, water and debris. Distribute it evenly; do not concentrate it at one end or lean it against a guardrail.
- Do not use the platform as a crane, a support for ladders or a place to stand on the guardrail. Tether tools.
Stability and travel
- Keep the platform level; avoid swinging it or pushing hard off the structure.
- Watch the ropes and rollers; keep clear of projections, window frames and scaffolding.
- Travel with the platform controlled, ropes not slack, and a clear view or a banksman.
- Maintain communication with the roof and ground - radio or agreed signals.
Weather
- Stop when wind reaches the manufacturer's or Code limit (often taken as 40 km/h at the platform) or when wind is gusting enough to move the platform or loose materials.
- Secure panels and sheeting; stop in heavy rain, lightning or poor visibility.
- On typhoon signal No. 8 or black rainstorm, stop, lower the platform to a safe position and secure the rig.
Below and around
- Establish an exclusion zone below; no person under the platform.
- Barricade and sign at ground level; coordinate with other trades.
Worked example
A two-person crew on a platform rated at 250 kg loads 60 kg of tools, two 25 kg tubs of sealant and 40 kg of cladding - 210 kg of material plus about 150 kg for the two persons, well over the rating. The correct action is to reduce materials, use a hoist for the cladding, and keep the platform within 250 kg including persons.
Traps
- Counting people but not materials.
- Reading the load plate but ignoring the persons limit.
- Judging wind at ground level rather than at the platform.
- Travelling with ropes slack or with the platform jammed against a wall.
- Leaving the platform suspended overnight without securing it.