CSP-11 CSP-11 D1.07 · Domain 1 · Advanced Application of Safety Principles · 25%
Machine Guard Stop Distance
Presence-sensing distance S=K T + C only with stem K,T,C. A yellow chain is not a guard. Cobot sticker ≠ risk assessment.
Updated . Independent CSP-11 practice. Not BCSP-endorsed. No pass guarantee.
Decision rule
Guard stopping distance is speed x time plus residual motion.
A light curtain too close can be reached before the machine stops.
In 20 seconds
- Guard stopping distance is speed x time plus residual motion.
- Stop-distance / safety distance for presence-sensing devices uses stopping performance and approach speed.
- If calculated distance exceeds available space, redesign — do not hope.
- Include deeper penetration factors when the standard/stem requires.
How to apply Machine Guard Stop Distance
THEORY: S = v x T (+ openings per the standard in the stem). Use given v and T. CALC: v=63 in/s, T=0.25 s → 15.75 in. TI-30XS: 63x0.25=. FIELD: Curtain mounted at 4 in with 16 in calculated need. Move it out or speed the stop. ASSESS: Pretty curtain at the wrong distance is the trap.
Worked case
Wrong first move: Mount tight for looks. Correct move: Compute S; set the device beyond it.
Why the rule holds
Related: 16.
Same rule, different setting
Press cell light curtain: compute S; prefer fixed/interlocked guards when feasible.
Jobsite saws and fab cells: fence the bite; procedures are not guards.
Picture / model
S=KT+C; guard hierarchy; robot RA before cobot mode.
Exam traps
Original SafePath contrasts for Machine Guard Stop Distance. These are study traps, not recalled BCSP items.
| Trap | Correct read |
|---|---|
| Fixed/interlocked guard | Engineering separation |
| Presence sensing | S=KT+C device |
| Two-hand control | Safeguarding — not always equal to fixed |
| Yellow chain | Boundary marker ≠ guard |
| Industrial robot | RA required |
Field move
S = 63 × 0.25 + 1.0 = 16.75 inches.
Scenarios
Scenario 1 · Applied Scenario · CSP-11 D1.07
You are the CSP reviewing a live decision at a refinery coker outage. Operations proposes a convenience path. Using the stated S=KT+C method, what minimum distance results from K=63 in/s, T=0.25 s, and C=1.0 in?
Best action: 16.75 in
Why: 63 × 0.25 = 15.75, and adding the 1.0 inch allowance gives 16.75 inches. Omitting C, or reporting K or T alone, does not finish the equation.
Scenario 2 · Applied Scenario · CSP-11 D1.07
You are the CSP reviewing a live decision at a bridge deck pour laydown yard. Operations proposes a convenience path. For K=63 in/s and T=0.25 s, which result would incorrectly omit the required 1.0-in C allowance?
Best action: 15.75 in
Why: The question asks which result incorrectly omits the 1.0 inch C allowance. KT alone is 63 × 0.25 = 15.75 inches. The full distance is 16.75 inches. C alone and 63.25 are not that omission.
Scenario 3 · Applied Scenario · CSP-11 D1.07
You are the CSP reviewing a live decision at a pharma suite changeover. Operations proposes a convenience path. Why is a yellow chain insufficient to safeguard the machine's accessible nip?
Best action: Not a guard
Why: Evaluate the best response. Keep people out of the bite with a fixed or interlocked guard when that is feasible. A collaborative label, a firmware change, or a bypassed interlock is not proof the application is safe. Stored pneumatic energy is released before entry. This item does not quote a robot…
If the stem says this
| Stem signal | Best direction |
|---|---|
| distance too short for stop time | increase distance or improve stopping |
| curtain bypassed for rate | stop — restore safeguarding |
| stop time worsened after maintenance | revalidate safety distance |
| two answers work | higher hierarchy / system / design |
| access rare and fixed guard possible | prefer fixed guard |
Check before you leave
- ✓ Stop-distance / safety distance for presence-sensing devices uses stopping performance and approach speed.
- ✓ If calculated distance exceeds available space, redesign — do not hope.
- ✓ Include deeper penetration factors when the standard/stem requires.
- ✓ Maintain brakes/clutches that determine stop time.
- ✓ Bypassing light curtains for production voids the safeguard.
- ✓ Hierarchy: fixed guards when access rare.
Blueprint mapping
Machine Guard Stop Distance is the SafePath study class for CSP-11 D1.07 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 D1.07
Other classes on this task
Guides that use Machine Guard Stop Distance
- 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
Machine Guard Stop Distance study questions
- What decision does the Machine Guard Stop Distance class train?
- Guard stopping distance is speed x time plus residual motion. This is independent SafePath CSP practice for CSP-11 D1.07. It is not an official BCSP item and it is not a pass guarantee.
- What exam trap shows up in Machine Guard Stop Distance?
- A common miss treats this as sufficient: Fixed/interlocked guard The stronger read is: Engineering separation
- How does Machine Guard Stop Distance map to the CSP-11 blueprint?
- SafePath maps this class to CSP-11 D1.07 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.