For portable or mobile equipment that is grounded, what is the maximum voltage that can develop between the frame of the equipment and ground?

The correct answer is that the maximum voltage that can develop between the frame of grounded portable or mobile equipment and the ground is 200 V. This standard is established to ensure safety and minimize the risk of electric shock. Grounding is an essential practice in electrical safety to prevent potential dangers caused by equipment malfunction or insulation failure.

When equipment is properly grounded, any fault current should ideally flow to the ground rather than through a person who might accidentally come in contact with the equipment. Limiting the voltage to 200 V helps ensure that even during faults, the voltage remains at a level considered to be reasonably safe for human contact. The threshold is set by industry standards to protect users and service personnel from electrical hazards, reflecting a balance between safety and practicality in operating conditions.

Understanding this limit is crucial when working with portable and mobile equipment in various environments, where the risk of electrical accidents can be higher due to the mobility and potential for exposure to various environmental conditions.