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Electrical Work Safety — LOTO (Lockout/Tagout) + Insulation PPE
Likely causes
LOTO standard procedure + insulation PPE mandatory
Check: **LOTO meaning** (Lockout/Tagout): worker safety procedure that cuts and locks the equipment's energy sources (electric/pressure/mechanical) + adds tag. Mandated by Korean Industrial Safety and Health Act. **5-step procedure**: ① Identify hazards and inform adjacent workers. ② Normal shutdown (user OFF). ③ Cut energy (breaker OFF). ④ **Lock the breaker + attach tag** (worker's name/ID). ⑤ Discharge and verify residual energy (tester shows 0 V). **Insulation PPE**: insulated gloves (rated DC 1000V/AC 750V), insulated shoes, safety glasses, hard hat.
What to do: **After work**: 1) Re-verify residual voltage (DC bus capacitor, batteries). 2) After job, only the worker who locked may remove lock/tag. 3) Restart system and confirm normal operation. **Shock emergency**: ① Separate victim from current (don't touch directly — use insulated rod). ② Unconscious → CPR + call 119. ③ Burns = run cool water for 15+ min. ④ Report incident + Ministry of Employment and Labor. Korea = mandatory immediate report on industrial accidents. **With R-Pro = LOTO checklist before work** (built-in standard, one click).
**Field trick**: Korean shock incidents = 50+/year (industrial accident stats). 80%+ stem from no LOTO. **Insulated gloves require 6–12 month insulation test** (KS C IEC 60903). Color rating = red = 7,500V / yellow = 17,000V (choose by voltage). **When working on inverter PCB = DC bus capacitor residual can be 600V+** = wait 10–15 min natural discharge or short with insulated screwdriver first. **R-Pro safety module** has LOTO + PPE checklists and incident report forms.
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