NEN 3140 §6
Lock Out, Tag Out, Try Out
LOTOTO (Lock Out, Tag Out, Try Out)
Also known as: loto, lock-out-tag-out, lockout-tagout, lockout
Procedure for safe work at zero voltage — disconnect, lock with personal lock, attach warning card, and verify zero voltage.
Practical example
LOTOTO (Lock Out, Tag Out, Try Out). Before motor maintenance, the group is switched off, locked with a padlock, tagged, and verified at zero volts.
Common mistake
LOTO (Lock Out, Tag Out, Try Out). Mistake: Switching off without locking with a personal padlock — a colleague may inadvertently re-energize the circuit while work is ongoing.
See also
Related terms
In-depth guides
- → Competent Person (VP) — NEN 3140 examination
- → §6.3 Working De-energized — The 5 Steps (LOTO)
- → IEC 61230 (aardingsset) Earthing and short-circuiting sets — periodic testing per IEC 61230
- → Inspectie Testing the RCD — trip time and residual current (NEN-EN-IEC 61557-6)
- → Inspectie ATEX explosion-hazard zones — classification & inspection
- → IEC 60079-14 ATEX cable entries — why an Ex e gland does not simply fit onto an Ex d enclosure
- → IEC 60079-0 Decoding the ATEX Ex marking — what does "Ex db IIC T4 Gb" mean?
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