Isolation Switches and Controls


Where appropriate, machinery should be provided with a means of completely isolating it from power.

The means of isolation must be clearly identifiable and readily accessible.

The purposes of isolation are to allow for safe maintenance and full disconnection of power in the event of unsafe conditions occurring.



Start up and process controls should not be so designed or positioned so as to present a risk to health and safety, such as by inadvertent start up.

Measures must be introduced to ensure that no start up will endanger operators or people in the vicinity of machinery.

Immediate observation and supervision underpinned by appropriate training and experience will be acceptable in achieving this in many circumstances.

A risk assessment may indicate that other measures such as a permit to work approach or start up prevention interlocks may be necessary in others.

Lancaster University
LancasterLA1 4YW United Kingdom
+44 (0) 1524 65201