1. Proper cable connection through a suitably rated starter.
2. No over load situation
3. Mechanically stable mounting and aligned well with the driven equipment.
4. Safety precautions to be taken based on the equipment driven by the motor.
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This is a very broad question. It depends on what purpose the motors is to be used for.
If for example, the motor was used to drive a table saw of course you would check to make sure that the blade was clear before starting the motor.
For motors used in commercial and industrial applications, periodical inspections would be made to make sure that the driven mechanisms are not worn or damaged. In applications where the motor could become contaminated by, for example sawdust, make sure that the cooling fins on the motor are not plugged and cause the motor to over heat.
These are all preventive maintenance procedures and really there is no written required safety precaution procedure before starting a motor. In most cases just plug it in or turn it on and it starts.
Make as little noise as possible
Yes
Edison invented the minor's safety lamp in the year 1914.
it is a safety measure and should not be bypassed.
It using it as intended by the manufacturer, none. Usually there will be a tab attatched to the product or on the packaging telling you what cannot be done with or to it on penalty of it no longer functioning properly. But most if not all cushions are very low voltage (9 to 12 V) and have a transformator between the cushion and the electricity socket. So they are made to be extremely low-risk. The only safety precaution you will be advised to take is printed on the plastic bag it comes in: "do not pull it over your head as this may lead to suffocation".