CSP-11 CSP-11 D1.03 · Domain 1 · Advanced Application of Safety Principles · 25%
Caught-in / Struck-by
A conveyor jams several times each shift. Operators can reach an in-running nip, and the proposed fix is a sleeve policy plus an emergency-stop button. Decide what controls belong in normal production, what belongs in hands-in servicing, and what must change in the design.
Updated . Independent CSP-11 practice. Not BCSP-endorsed. No pass guarantee.
Decision rule
Separate people from moving loads and rotating parts. A spotter is not a barrier.
Caught-in and struck-by are energy-path problems. Guard, isolate, or reroute the path before staffing the hazard.
In 20 seconds
- Separate people from moving loads and rotating parts.
- A spotter is not a barrier.
- Guard the nip and point of operation for production.
- LOTO for service — a spotter is not a guard.
How to apply Caught-in / Struck-by
THEORY: Construction/general-industry struck-by and caught-in logic — the body must not share the load path or the nip. Hierarchy: remove the line of fire, then engineer stops and guards, then admin, then PPE. CALC: None unless the stem gives stopping distance or swing radius. If it does, use the given figures only. FIELD: Laydown yard with a swinging load over a walkway. Close the walkway or change the pick path before issuing vests. ASSESS: High-visibility clothing does not interrupt a load path.
Worked case
Wrong first move: vests and a spotter under a live pick path. Correct move: keep people out of the swing radius; use tag lines and a planned landing zone.
Why the rule holds
Maintenance access at the rear of a cell is a design user. Related: 13, 14, 16, 110.
Same rule, different setting
A belt conveyor nip on a load-out is exposed during jam clearing. Operations wants posters and cut-resistant sleeves. You are the CSP. The question is whether the nip must be reachable while the belt can move.
A site conveyor nip is exposed during jam clearing. Operations wants posters and cut-resistant sleeves. You are the CSP. The question is whether the nip must be reachable while the belt can move.
Picture / model
Energy-path map: caught-in hazards draw or crush the body at a moving interface; struck-by hazards deliver impact from a vehicle, load, tool, or released object. Production access is guarded or otherwise safeguarded; servicing uses applicable hazardous-energy isolation; people are physically separated from vehicle and load paths. Posters, PPE, and spotters are supporting layers.
Exam traps
Original SafePath contrasts for Caught-in / Struck-by. These are study traps, not recalled BCSP items.
| Trap | Correct read |
|---|---|
| Sleeves and a clothing poster | PPE / admin around an unguarded nip |
| Fixed/interlocked guard on the nip | Engineering for production |
| LOTO then clear the jam | Isolation for service |
| Spotter for a backing truck | Administrative — design the path or the restraint |
Field move
Sleeves do not guard a live nip.
Scenarios
Scenario 1 · Fundamental · CSP-11 D1.03
Conveyor nip is reached to clear jams with the belt live. Operations proposes sleeves and a clothing poster. Best control?
Best action: Guard/interlock the nip for production and LOTO before anyone enters the zone; design a clearing method that keeps the body out.
Why: Evaluate the live belt. The conveyor nip is reached to clear jams with the belt running, and operations proposes sleeves and a clothing poster. Guard or interlock the nip for production, and lock out before anyone enters the zone. Design a clearing method that keeps the body out. Sleeves as the pri…
Scenario 2 · Applied Scenario · CSP-11 D1.03
A light curtain is muted so an operator can straighten a part during the cycle. Best CSP comment?
Best action: Stop: muting to put a body in the point of operation defeats the presence sensor. Fix the process or use a designed stop-time mode; do not reach in live.
Why: Evaluate the muted light curtain. It is muted so an operator can straighten a part during the cycle. Stop. Muting to put a body in the point of operation defeats the presence sensor. Fix the process or use a designed stop-time mode. Do not reach in live. Calling that minor servicing, cut-resistant…
Scenario 3 · Applied Scenario · CSP-11 D1.03
Pedestrians and forklifts share an aisle. Warehouse wants horns and vests. Layout can still add a guarded walkway. Best control?
Best action: Physical separation (guarded walkway / no-go aisle); horns and vests only for residual.
Why: Evaluate the shared aisle while the layout can still add a guarded walkway. Pedestrians and forklifts use the same aisle, and the warehouse wants horns and vests. Physical separation, a guarded walkway or a no-go aisle, is the control. Horns and vests cover only what remains. A spotter at every int…
If the stem says this
| Stem signal | Best direction |
|---|---|
| the guard is removed for production speed | stop and restore safeguarding before running |
| service requires hands in the machine | full LOTO — not inch-mode with a spotter |
| pedestrians share an aisle with PIT traffic | engineered separation before vests alone |
| a suspended load can swing into a walkway | exclusion zone and control — not hope |
| two answers work | higher hierarchy / system / design |
Check before you leave
- ✓ Guard the nip and point of operation for production.
- ✓ LOTO for service — a spotter is not a guard.
- ✓ Separate people from loads, vehicles, and released energy.
- ✓ Stored energy (springs, gravity, pneumatics) counts in caught-in logic.
- ✓ Floor tape loses to fixed barriers and interlocks still on the option sheet.
- ✓ Struck-by controls include exclusion zones, restraints, and engineered stops.
Blueprint mapping
Caught-in / Struck-by is the SafePath study class for CSP-11 D1.03 inside CSP-11 Domain 1, Advanced Application of Safety Principles (25%). The largest CSP-11 domain. It tests whether you can select and evaluate practical controls across design, process safety, workplace hazards, life safety, fleet safety, materials handling, and equipment.
SafePath uses the publicly posted CSP-11 outline as a study map. It does not reproduce official exam content, and it is not affiliated with or endorsed by BCSP or Pearson VUE.
Practice / flashcards / formulas
More classes in Advanced Application of Safety Principles
Nearby lessons mapped to the same CSP-11 domain.
CSP-11 D1.03
Other classes on this task
Guides that use Caught-in / Struck-by
- Construction safety study guideFalls, lifting, excavation, and design controls
- Manufacturing safety study guideGuarding, hazardous energy, and change
- CSP-11 exam prep guideDomain weights, sample items, and a study sequence
- CSP-11 blueprint and weightsSeven published domains and the class map
- Seven-domain study directoryScope, tasks, and links into each lesson
Caught-in / Struck-by study questions
- What decision does the Caught-in / Struck-by class train?
- Separate people from moving loads and rotating parts. A spotter is not a barrier. This is independent SafePath CSP practice for CSP-11 D1.03. It is not an official BCSP item and it is not a pass guarantee.
- What exam trap shows up in Caught-in / Struck-by?
- A common miss treats this as sufficient: Sleeves and a clothing poster The stronger read is: PPE / admin around an unguarded nip
- How does Caught-in / Struck-by map to the CSP-11 blueprint?
- SafePath maps this class to CSP-11 D1.03 in Domain 1, Advanced Application of Safety Principles (25% of the published blueprint). Use the public outline for study planning. SafePath is not affiliated with or endorsed by BCSP.
Verify
Verify: Confirm current certification requirements with BCSP and technical requirements with the cited authoritative standard.