How much current is considered to be harmless but still felt during a shock?

The amount of current that is generally considered to be harmless but still felt during a shock is 1 milliampere (mA). At this level, an electrical shock can be perceived by a person and may cause a tingling sensation, but typically does not cause any serious harm or injury. It is important to recognize that currents below this threshold are often regarded as safe for human interaction.

In comparison, currents above this level, such as 5 milliamperes or 10 milliamperes, can lead to stronger sensations and potential health risks. Specifically, at 10 milliamperes, muscle contractions may occur, and currents in the range of hundreds of microamperes may not even be felt. Understanding these thresholds is essential for safety in handling electrical systems, particularly in aircraft armament systems, where technicians must be aware of electrical safety standards.