Access to the hazardous area needs to be assessed as either part body or full body access. Once this is determined an access lock can be selected. Full body access locks have two locking mechanisms with one key trapped at all times. The first step in the process is to insert and trap the isolation key. This will allow the personnel key to be removed and then access can be granted by releasing the bolt. The isolation key can only be removed once the personnel key has been re-inserted. Therefore whilst the personnel key is removed and the lock is open the process cannot be started. Only once the lock is closed and the personnel key returned, can the isolation key be removed and returned to the power isolator.
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