Imported from 5throck/ai-workspace-standards (templates/co-safety/.gemini/skills/rack-fall-protection-planner/SKILL.md). Install upstream with npx skills add 5throck/ai-workspace-standards --skill rack-fall-protection-planner. Copyright stays with the author.

audit_exception: safety-os-skill-structure — Safety OS skills use the legal_basis-gated SSOT skill format (validated by scripts/skill-lifecycle-audit.ts and scripts/validate-skills.ts), not the generic template 5-section/7-frontmatter schema

Rack Fall Protection Planner Skill

Overview

Datacenter white-space work-at-height fall-protection planner. Covers the four pervasive fall-exposure scenarios unique to datacenter operations — server-rack installation (42U-52U cabinets ~2 m+), overhead cable-tray work, top-of-rack (TOR) switching, and raised-floor tile access — none of which are addressed by generic construction fall-protection skills.

The general construction skill fall-hazard-assessor covers building leading edges, rooftops, and excavation edges. It does NOT cover the datacenter white-space environment, where (a) there are no permanent anchor points, (b) the raised floor is a trip-and-collapse hazard rather than a fall-arrest anchor, (c) hot-aisle / cold-aisle geometry restricts ladder placement, and (d) rack frames are typically NOT rated as anchor points.

Korean Datacenter Fall Context

Hazard profile (from datacenter regulatory anchor)

The datacenter industry anchor (regulations/KR/industry-regulatory-anchors.yaml lines 309-315) names two OSHA-KR hazards: Article 38 (추락 방지 포함 안전조치 — fall prevention during racking/cabling) and OSHSR electrical standards. Article 38 is the only anchor-cited datacenter hazard with no corresponding workflow or skill prior to the rack-cabling-fall-protection workflow (Task A-04, 2026-08-07).

Why datacenter work-at-height is distinct

Low fall height (1-3 m) is deceptive — it accounts for the majority of lost- time datacenter injuries because of awkward posture inside cold aisles and unplanned descent onto hard slab or rack corners.

Hazard Scenarios Covered

1. Server-rack installation (42U-52U, ~2 m+)

• Unboxing / lifting the rack onto the slab (heavy-load, awkward-grip fall risk)
• Rail extension and server insertion at shoulder-to-overhead height
• Top-of-rack (TOR) switch / patch panel install at maximum reach
• Standing on the rack frame or rack PDUs to reach the top — prohibited

2. Overhead cable-tray work

• Ladder work along overhead tray runs (typically 2.7-3.3 m AFF)
• Pulling copper/fiber bundles across multiple racks
• Tray-to-rack vertical drop termination

3. Raised-floor tile access

• Tile removal for sub-floor cabling / power-whip install
• Reach into the sub-floor plenum (kneeling + leaning = tip-in hazard)
• Tile replacement (finger pinch + dropped-tile laceration)

4. Ladder work in aisles

• Step-ladder vs. extension-ladder vs. rolling work-platform selection
• Ladder foot placement on anti-static tile (slip vs. tile-crush)
• Three-point-contact discipline while handling fiber/copper

Fall-Protection Hierarchy (datacenter-specific)

1. Elimination

• Pre-populate top-of-rack hardware at the integration lab before deployment
• Use tool-less hardware that minimizes overhead-reach time
• Pre-terminate sub-floor cabling before floor tiles are re-installed

2. Engineering controls (preferred over PPE)

• Rolling work-platform with locking casters and guardrail — the default elevated-work device for rack install (NOT a step-ladder)
• Mobile anchor post on a weighted base — engineered for 22 kN arrest load
• Powered vertical lift (scissor lift) for cable-tray runs in co-location halls with sufficient slab clearance

3. Active fall protection (when engineering controls are infeasible)

• Restraint system (preferred over arrest) — lanyard length tuned so the worker cannot physically reach the leading edge of the work platform
• Self-retracting lifeline (SRL) if arrest is unavoidable
• Anchor: NEVER the rack frame (rated for equipment weight, not 22 kN arrest load). Use a mobile anchor post or building-engineered anchor only.

4. Administrative controls

• Work-permit (작업허가서) for any work above 2 m per OSHA-KR Article 38
• Tool-box talk (TBM) before each shift — see shared TBM workflow
• Buddy system — second worker as spotter + 119 caller
• De-energize adjacent busway if work reaches within 1 m of live 208/400 V

5. PPE

• Full-body harness certified per KOSHA 안전검사 합격품
• Hard hat with chin strap (overhead cable-tray work — dropped-object hazard)
• Safety footwear (sub-floor debris + dropped-tool protection)
• Anti-fatigue gloves (pinch-point protection at rail / server slides)

Planning Workflow

1. Work-zone characterization — aisle width, slab clearance, busway proximity, raised-floor condition
2. Anchor survey — confirm no permanent anchor; deploy mobile anchor post
3. Equipment selection — rolling work-platform > step-ladder > extension
4. Restraint vs. arrest decision — prefer restraint if leading-edge reach can be physically prevented
5. Co-located energy review — de-energize or guard adjacent busway / water
6. Permit + TBM — 작업허가서 issued, TBM conducted and signed
7. Execution + spotter — second worker positioned for fall-arrest rescue
8. Post-work walk-down — tiles re-seated, hardware torqued, no debris
9. Rescue plan — suspension-trauma response within 10 minutes per KOSHA

Output

{
  "plan_id": "dc-rfpp-2026-08-07-001",
  "site": "DC-1 Hall B Row 12",
  "task_type": "rack_install_top_of_rack",
  "work_height_m": 2.1,
  "workers_exposed": 2,
  "hazard_scenarios": ["server_rack_install_42U", "top_of_rack_switch"],
  "elimination_opportunities": ["pre-populate TOR at integration lab"],
  "engineering_controls": {
    "primary": "rolling_work_platform_with_guardrail",
    "anchor": "mobile_anchor_post_weighted_base",
    "anchor_rating_kN": 22
  },
  "active_protection": {
    "type": "restraint",
    "lanyard_length_m": 1.8,
    "leading_edge_reachable": false,
    "anchor_used": "mobile_anchor_post"
  },
  "co_located_energy": {
    "busway_de_energized": true,
    "water_line_guarded": true
  },
  "administrative": {
    "permit_issued": true,
    "permit_id": "WP-2026-08-07-0142",
    "tbm_conducted": true,
    "spotter_assigned": "worker_2"
  },
  "rescue_plan_ref": "DC-1-ERP-2026-suspension-trauma",
  "regulatory_basis": [
    "산업안전보건법 (OSHA-KR) Article 38 — 추락 등 위해 방지 안전조치",
    "전기안전관리법 (ESCA) Article 16 — 전기재해 예방 안전조치",
    "중대재해처벌법 (SAPA) Article 4 — 사업주 안전보장 의무"
  ],
  "acceptance_status": "ready_to_execute"
}

Korean-Specific Standards

• 산업안전보건법 (OSHA-KR) Article 38 — 작업장 추락 등 안전조치 (mandatory fall-prevention measures; 2 m threshold for active protection)
• KOSHA 안전검사 합격품 — harnesses, lanyards, SRLs must carry the KOSHA certification mark
• 119 구조대 연계 — suspension-trauma rescue relies on rapid 119 dispatch
• Datacenter-specific: most Korean co-location halls require the tenant's 작업허가서 to be countersigned by the facility's electrical safety manager (전기안전관리자 per ESCA Art 22) before any rack work begins

Integration

• Input from: datacenter work-order, rack-elevation drawing, busway layout
• Output to: datacenter-rack-cabling-fall-protection-record.json (the evidence model for the rack-cabling-fall-protection workflow)
• Coordinated skills:
  • fall-hazard-assessor (ehsconst) — for building/structural fall hazards outside the white-space (mechanical-room roof, chiller pad)
  • tool-box-meeting (TBM) — pre-work briefing record
• Escalation: If no engineered anchor is available AND busway cannot be de-energized, halt work and escalate to site 전기안전관리자

Non-Duplication Justification

vs. fall-hazard-assessor (ehsconst): that skill addresses construction-site leading edges, rooftops, and excavation edges where permanent anchors and guardrails are the norm. It does NOT cover the datacenter white-space environment (no permanent anchors, raised-floor tile hazard, hot/cold aisle constraints, co-located live busway). The work-height regime is also different (1-3 m low-height high-frequency vs. 2-50 m+ construction).

vs. permit-to-work (daily): that skill issues the 작업허가서 generically; this skill produces the datacenter-specific fall-protection plan that the permit references.

Legal Disclaimer

자동화 계획 보조. 최종 추락 방지 조치 결정은 안전관리자 + 전기안전관리자 권한 per 산업안전보건법 (OSHA-KR) Article 38 and 전기안전관리법 (ESCA) Article 16. Anchor ratings and busway de-energization status MUST be verified by a qualified electrical safety manager before work begins.