Stop Controls and Emergency Stop Controls
Machinery, where appropriate, must have one or more stop controls that are readily accessible to the operator and will bring the machine to a stop in a safe manner.
Where necessary for reasons of health and safety this shall bring the machine to a complete stop.
The stop control should switch off all sources of energy after stopping the function of the machine.
The stop control must operate in priority to any other control which starts the machine. It should not require anything more than a short manual action to operate.
Emergency Stop Controls
Machinery, where appropriate, must be fitted with one or more emergency stop controls unless it is not necessary by virtue of the nature of the hazards and the time taken for the machine to come to a complete stop as a result of the operation of a standard stop control.
An emergency stop control should be provided where other safeguards in place are not adequate to prevent risk when an irregular event occurs.
An emergency stop is not a substitute for effective safeguarding.
Where there is a necessity determined by risk assessment, an emergency stop should be provided at every control point and any other appropriate location around equipment so that action can be taken quickly.
It is desirable that emergency stop buttons rapidly bring a machine to a stop, this must be achieved under control so as not to create any additional hazards.
This should be within 10 seconds.
Emergency stops are intended to effect a rapid response to a dangerous situation and should not be used as functional stops during normal operation.
Common types are:
- Mushroom headed buttons
- Kick plates
- Pressure sensitive cables
Current British, European and International standards cover the design and operation of emergency stop controls.
These standards cover such matters as latch control, power cut fail safes and machine braking technology.