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…
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…
There is a note in table 17 and table 18 as “For working voltages > 10 V and ≤ 630 V, if the voltage is not specified in the table, the values of creepage distances may be found by interpolation.”. If the operating voltage is not the value listed in the table, then we usually…
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