class 0I appliance: appliance having at least basic insulation throughout and incorporating an earthing terminal but having a supply cord without earthing conductor and a plug without earthing contact. The appliance has a terminal for connecting an external protective conductor (protective earth conductor), but there is no wire for connecting the appliance to the protective…
class 0 appliance: appliance in which protection against electric shock relies upon basic insulation only, there being no means for the connection of conductive accessible parts, if any, to the protective conductor in the fixed wiring of the installation, reliance in the event of a failure of the basic insulation being placed upon the environment.NOTE…
protective impedance: impedance connected between live parts and accessible conductive parts of class II constructions so that the current, in normal use and under likely fault conditions in the appliance, is limited to a safe value. Case 1:The first case is usually some situations that require low-voltage power supply, such as adapter-powered products. The output…
functional insulation: insulation between conductive parts of different potential which is necessary only for the proper functioning of the appliance. Functional insulation is set because of the functional needs of the appliance. In electrical products, there must be conductive parts with different potentials (different voltages). If the voltage of all energized conductors in the product…
reinforced insulation: single insulation applied to live parts, that provides a degree of protection against electric shock equivalent to double insulation under the conditions specified in this standard.NOTE It is not implied that the insulation is one homogeneous piece. The insulation may comprise several layers which cannot be tested singly as supplementary insulation or basic…
double insulation: insulation system comprising both basic insulation and supplementary insulation The definition is only to simplify the description of basic insulation and supplementary insulation in the standard, using one name to descirbe two names. As shown in the figure below, the supply cord has two layers of insulation, the inner wire sheath and the…
supplementary insulation: independent insulation applied in addition to basic insulation, in order to provide protection against electric shock in the event of a failure of basic insulation An insulation that is outside the basic insulation and is independent of the basic insulation, and is usually accessible to the user. Supplementary insulation, as the name implies,…
basic insulation: insulation applied to live parts to provide basic protection against electric shock Generally speaking, a layer of insulation that is in direct contact with a live part can be a common insulating material (such as plastic materials such as PVC and ABS), or it can be air or a distance ( creepage distance) formed…
The type of connection is defined by the manufacturer of the appliance. Generally speaking, it is rare to define it as Type X, because this will bring unnecessary risks to the manufacturer. It is commonly defined as Type Y. Of course, if the power cord is cast, it is generally defined as Type Z. The…
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