The safety disconnect ensures the equipment can be isolated and there is less chance of someone turning the power back on if they can see the work going on. In the USA, the National Electric Code states that a safety/service disconnect must be installed within sight of serviceable equipment. To emphasize the last step above in addition to the others, the entire process can be referred to as lock, tag, and try (that is, trying to turn on the isolated equipment to confirm it has been de-energized and cannot operate). The locking and tagging of the isolation point lets others know not to de-isolate the device.
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