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…
We know that clause 29.3.2 and clause 21.2 are two separate clauses and they are not very much related, which means that the product being assessed needs to fulfill both clauses if applicable.A reinforced insulation system consisting of three separate layers of insulating material or what could be considered a double insulation system, Each layer…
non-detachable-part: part that can only be removed or opened with the aid of a tool or a part that fulfils the test of 22.11. The definition of this concept is mainly for the judgment of clause 8 and clause 20, and the judgment of other clauses may also be used. On the appliance, whether any…
combined appliance: appliance incorporating heating elements and motors. We know that this standard mainly protects against the following five types of dangers, which are electric shock, mechanical damage from moving parts, thermal damage (such as burns), fire damage, chemical and biological damage. Generally speaking, thermal damage is caused by electric heating elements, and mechanical damage…
creepage distance: shortest distance along the surface of insulation between two conductive parts or between a conductive part and the accessible surface. Charges can be propagated in a directional manner through the air, thus forming an current. This is the meaning of clearance. Charges can actually also propagate through the insulating material itself, because no…
class III appliance: appliance in which protection against electric shock relies on supply at safety extra-low voltage and in which voltages higher than those of safety extra-low voltage are not generated.NOTE basic insulation may be required in addition to supply at SELV. Refer to 8.1.4. To understand this, you need to first understand what is…
class II appliance: appliance in which protection against electric shock does not rely on basic insulation only but in which additional safety precautions are provided, such as double insulation or reinforced insulation, there being no provision for protective earthing or reliance upon installation conditions. NOTE 1 Such an appliance may be of one of the…
class I appliance: appliance in which protection against electric shock does not rely on basic insulation only but which includes an additional safety precaution, in that conductive accessible parts are connected to the protective earthing conductor in the fixed wiring of the installation in such a way that conductive accessible parts cannot become live in…
Clause 8.1.1 mentions that the test probe should be used when the appliance is under “normal use”, while clause 8.1.5 is evaluated prior to installation. Products such as these, which are delivered in several parts, generally require on-site installation. “Live parts of built-in appliances, fixed appliances and appliances delivered in separate units, shall be protected at least by basic insulation before installation or assembly.” Here a type of hazard during installation arises. An example is as follows: An air-conditioning…
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