Signals, communication and site coordination
This domain tests how the operator, signalman and landing users communicate so the cage moves only when it is safe. Most questions hinge on unclear signals, multiple signalmen and communication failure.
Communication chain
- Use the site's agreed signal code: bell, whistle, radio, telephone or hand signals. Hand signals are not universal; confirm the code before work starts.
- One signalman should control movements at a time. Multiple signalmen giving different instructions create conflicting commands.
- The operator must not move on an unclear, ambiguous or unexpected signal. Confirm or stop.
- Anyone may give an emergency stop signal. The operator must act on it immediately and investigate before restarting.
- Maintain communication at every landing, especially where the operator cannot see the landing edge or the load.
Site coordination
Coordinate with other trades before hoist use. Keep landing areas clear, control access, and use barriers or exclusion zones where loads are transferred. During maintenance or repair, lockout/tagout and communication with the maintenance person take priority over production requests.
Worked example
A radio fails while the cage is at level 12. The signalman is behind scaffold sheeting and the operator cannot see him. The signalman starts giving hand signals that the operator cannot interpret clearly. Decision: stop and hold the cage at a safe landing. Do not guess the signal. Use the agreed backup, such as a fixed telephone or a runner, or wait for the radio to be restored and the signal confirmed. Movement resumes only when communication is clear and the landing is confirmed safe.
Traps that cost marks
- Acting on a signal from someone who is not the authorised signalman.
- Assuming a hand signal means the same on every site.
- Continuing after radio failure because "the load is small".
- Treating an emergency stop signal as a request to finish the trip first.