showstack / glossary / lockout-tagout
Lockout/tagout (LOTO) 上鎖掛牌
Physically locking an energy-isolating device — a breaker, a disconnect, a valve — in the off position and tagging it before anyone works on the equipment downstream, so a second person cannot re-energise it while a tech's hands are inside. The tag is a warning; the lock is the actual control. US practice under OSHA treats it as one program covering every energy type, verified by trying to start the equipment afterward, not just reading a meter.
Regional usage
| Where | Term | Note |
|---|---|---|
| HK | 上鎖掛牌 | HKSAR EMSD guidance on breaker/switch isolation for electrical work uses 開關掣上鎖掛牌 for this exact procedure. |
Easy to get wrong
US LOTO (OSHA 1910.147) verifies by "try-out" — attempting to start the equipment. UK "safe isolation" is narrower, electrical-only, verified by proving dead with a voltage indicator.
The two overlap but are not one procedure. A site running to one standard is not automatically compliant with the other, whatever a touring rider assumes.
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Sources
- 1910.147 - The control of hazardous energy (lockout/tagout) — OSHA primary
- Safe Isolation vs Lockout Tagout: Key Differences Explained — HSEBlog
- 電力安全評估表格的填寫和斷路器上鎖掛牌的處理 — Electrical and Mechanical Services Department, HKSAR Government primary
Understand the mechanism
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