CEN/TC 114/WG 9 - Emergency stop and safety hold

This standard specifies built-in safety measures aimed at preventing unexpected machine start-up (see 3.2) to
allow safe human interventions in danger zones (see Annex A).
This standard applies to unexpected start-up from all types of energy source, i.e.:
- Power supply, e.g. electrical, hydraulic, pneumatic;
- Stored energy due to, e.g., gravity, compressed springs;
- External influences, e.g. from wind;

This standard specifies built-in safety measures aimed at preventing unexpected machine start-up (see 3.2) to allow safe human interventions in danger zones (see Annex A).   This standard applies to unexpected start-up from all types of energy source, i.e.:   - power supply, e.g. electrical, hydraulic, pneumatic;  - stored energy due to, e.g., gravity, compressed springs;  - external influences, e.g. from wind.

This standard specifies design principles for emergency stop equipment for machinery. No account is taken of the nature of the energy source.  A functional demarcation of the emergency stop equipment is shown ... [A second figure illustrates the location of this equipment in machinery.]