Isolation of Multiple Energy Sources (LOTO Beyond Electrical)
The recognition that a machine or installation, besides its electrical supply, often also contains other stored forms of energy that must be separately isolated and released during maintenance before work can safely begin: hydraulic pressure in cylinders and piping, pneumatic pressure in air receivers, mechanically stored energy in loaded springs or suspended masses, and thermal energy in heated components. Switching off and locking out the electrical supply alone (lock-out) is then insufficient: each energy source requires its own isolation point, its own lock, and where relevant a demonstrable release (for example bleeding hydraulic pressure or mechanically blocking a suspended load) before the zero-energy state may be considered achieved.
Voordat onderhoud wordt uitgevoerd aan een hydraulische pers vergrendelt de monteur niet alleen de elektrische hoofdschakelaar, maar laat hij ook de hydraulische druk in het systeem terugvallen naar nul en blokkeert hij mechanisch de opgeheven perskop tegen onbedoeld zakken.
Alleen de elektrische voeding vergrendelen en ontgrendelen van de energiestatus als voltooid beschouwen, terwijl resterende hydraulische of pneumatische druk in het systeem bij het openen van een leiding of cilinder alsnog letsel kan veroorzaken.
See also
- → IEC 60204-32 IEC 60204-32 — hoisting machines: why a crane's electrical safety needs more than 60204-1
- → EN 2 / IEC 61243 Fire extinguishers for electrical installations — there is no separate "fire class E", but there is a separate voltage test
- → NEN-EN-IEC 60974 Arc welding — electrical safety and open-circuit voltage
- → NEN-EN 50110-1 First aid for electrical accidents — rescue and resuscitation
- → §3.6 Danger zone and approach zone — the three types of electrical work
- → IEC 62353 IEC 62353 — periodic testing of medical electrical equipment