Clause 3 – How to understand the definition of “accessible part”

accessible part: part or surface that can be touched by means of test probe B of IEC 61032, and if the part or surface is metal, any conductive part connected to it.
NOTE Accessible non-metallic parts with conductive coatings are considered to be accessible metal parts.

There are some parts or surfaces in the appliance that is not allowed be touched or be accessible, the reason for this may be high temperature, may be electrically charged, or there may be mechanical injuries, such as the movement of the fan blade. The smallest part of the human body that can touch other objects is the finger, but different people’s fingers are different, so the standard here stipulates a fixed size of the finger, finger size in accordance with the standard IEC 61032 in the type B finger. The following figure

It is also important to note here that if the part touched by the tested finger is metal, because metal conducts electricity, then parts such as those touched by metal parts are considered electrically accessible. In practice, the requirement that metal parts may be electrically conductive does not need to be taken into account when determining injuries to moving parts.

Type B test probes have a design that is without joints. Typically, standards will require that a test finger without joints be used first, followed by a test finger with joints. The exact method of inspection is discussed in clause 8.