Discuss interlocked guards and cite references.

Interlocked guards are safety devices that are designed to prevent access to a hazardous area or machine until certain conditions are met. These conditions typically involve the machine being in a safe state, such as being turned off or in a certain position, before the guard can be opened or removed. Interlocked guards are an important safety feature in many industrial settings to protect workers from potential hazards.

One example of an interlocked guard is a safety gate on a machine that will not open unless the machine is turned off. This ensures that the machine cannot be accessed while it is in operation, reducing the risk of injury to workers. Interlocked guards can also be used on other types of equipment, such as conveyor belts or robotic arms, to prevent access to dangerous areas.

References:
1. "Interlocked Guards." OSHA. https://www.osha.gov/SLTC/etools/machineguarding/guards.html
2. "Interlocked Guards." Health and Safety Executive. https://www.hse.gov.uk/machinery/guarding.htm
3. "Interlocked Guards." Canadian Centre for Occupational Health and Safety. https://www.ccohs.ca/oshanswers/safety_haz/machine_guarding.html

Interlocked Guards

Interlocked guards are protective mechanisms designed to prevent access to hazardous areas or prevent the operation of hazardous machinery unless certain safety conditions are met. They physically prevent individuals from entering dangerous zones or make it impossible to start equipment until all safeguards are in place.

Principle of Operation

Interlocked guards use mechanical, electrical, or electronic devices to connect a machine's operation to the presence or absence of a specific safety device. When the safety device is activated, the guard interlocks with the machine, preventing its operation until the safety condition is restored.

Types of Interlocked Guards

- Mechanical Interlocks: Physical devices, such as keys, locks, or magnetic switches, that physically block access or prevent machine operation.
- Electrical Interlocks: Electrical circuits that connect the safety device to the machine's power supply, preventing operation until the safety device is active.
- Electronic Interlocks: Advanced electronic systems that use sensors and programmable logic controllers (PLCs) to monitor safety conditions and prevent machine operation if necessary.

Benefits of Interlocked Guards

- Enhanced safety: Guards prevent accidental entry into hazardous areas and protect workers from dangerous machinery.
- Reduced accidents: By preventing access to unsafe conditions, interlocked guards reduce the risk of injuries and fatalities.
- Compliance with safety regulations: Interlocked guards meet safety requirements set by regulatory agencies and insurance companies.
- Improved productivity: By preventing accidents and disruptions, guards help maintain efficient machine operation.

References

- Occupational Safety and Health Administration (OSHA): https://www.osha.gov/safety-topics/machine-guarding
- National Institute for Occupational Safety and Health (NIOSH): https://www.cdc.gov/niosh/topics/machineguarding/default.html
- American National Standards Institute (ANSI): https://www.ansi.org/
- International Labour Organization (ILO): https://www.ilo.org/global/topics/machine-safety/lang--en/index.htm

Explore on scope of social practices in kenya