Final answer:
It is false that the Ridgid Conduit Threader should be left plugged in while maintaining or adjusting. For safety, equipment should always be unplugged during such procedures to avoid accidents like electrocution.
Step-by-step explanation:
The statement 'The Ridgid Conduit Threader is left plugged into the AC receptacle while adjusting or maintaining the machine' is false. For safety reasons, any equipment, especially those involving high voltage or mechanical movement, should be unplugged or disconnected from power sources while being adjusted or maintained. This prevents accidental start-up and the associated risks of electrocution or injury.
This principle is consistent with safe practices across various scenarios. For example, identifying problems with an electrical outlet involves testing it with multiple devices. If a coffeemaker doesn't work when plugged into the same outlet, this supports the hypothesis that there's an issue with the outlet itself, not the individual appliances. Moreover, the design of a three-hole outlet and standard three-prong plugs ensures that plugs can only be inserted one way, maintaining the integrity of the three-wire system for grounding and safety purposes.