What is a lock?
A lock is the use of one or more locks to shut off power, or to shut down a machine or equipment. The purpose of locking is to prevent an energy disconnect device (such as a key switch, circuit breaker, or valve) from being accidentally opened by a worker while the machine or equipment is being repaired. Locking ensures that machines or equipment do not start to prevent injury to workers.
Before locking any machine or equipment, you must cut off the power. This procedure is called power cutoff. For example, you must turn off the machine before locking it, unplug (or use the power cut button) to prevent the machine from being accidentally started.
In a word, you must cut off the power and lock the machine and device before making any repairs. So no one else can restart the machine. The purpose of maintenance is to ensure the normal and safe operation of machinery or equipment. Maintenance includes installing parts, repairing, cleaning and lubricating parts, and removing obstacles to normal logistics.
About how to decide whether to lock or not
Follow these steps to determine if you need to lock the machine or equipment:
1. Check out your work environment
Identify all sources of energy
3. Ask yourself: What will happen if one of these sources gives away energy? Do workers suffer when energy is distributed or when there is an occasional start?
It must be locked if the situation poses a danger to workers. Lock the energy isolation device to prevent the release of dangerous energy, such as someone accidentally switch on the key, start the machine, to ensure that all parts and accessories do not accidentally start.
Locks are not required if the situation does not pose a danger to workers. Workers are only required to follow a general code of work safety.