IEC 60085 pdf download Electrical insulation – Thermal classification
This standard gives guidance on the application of international standards in assigning athermal class to electrical insulating materials (EIM) or simple combinations of such materials(IEC 60216-1), to electrical insulation systems (IEc 62114) and to insulation for electricaldevices.
The following referenced documents are indispensable for the application of this document.For dated references, only the edition cited applies.For undated references, the latest editionof the referenced document (including any amendments) applies.
IEC 60216-1，Electrical insulating materials – Properties of thermal endurance – Part 1: Ageingprocedures and evaluation of test results
IEC 60216-5，Electrical insulating materials – Thermal endurance properties – Part 5:Determination of relative thermal endurance index (RTE) of an insulating material
IEC 60216-6,Electrical insulating materials – Thermal endurance properties – Part 6:Determination of thermal endurance indices(Tl and RTE) of an insulating material using the fixed timeframe method
IEC 61857-1，Electrical insulation systems – Procedures for thermal evaluation – Part 1:General requirements – Low-voltage
IEC 62114，Electrical insulation systems – Thermal classification
3Terms and definitions
For the purposes of this document, the following terms and definitions apply:
electrical insulating materialEIM
solid with negligibly low electric conductivity,or a simple combination of such materials,usedto separate conducting parts at different electrical potential in electrical devices
NOTE1 In English，the term “insulating material” is sometimes used in a broader sense to designate alsoinsulating liquids and gases.
NOTE 2 For testing purposes,electrodes may be applied on material specimens without this combination formallyconstituting an EiS to be tested as such.
simple combination of electrical insulating materials
combination of EIM delivered in joint state for production of devices
NOTE For example a flexible material consisting of paper laminated on polyethylene terephthalate film(IEC 60626) constitutes a “simple combination” in this sense.EIMs combined during the manufacturing process ofa device do not constitute “simple combinations” in this sense,
electrical insulation systemEIS
insulating structure containing one or more electrical insulating materials (EIMs) together withassociated conducting parts employed in an electrotechnical device
designation of an EIM/ElS equal to the numerical value of the maximum used temperature indegrees Celsius for which the EIM/EIS is appropriate
NOTE lt may be necessary to assign different thermal classes to the same EIM/EIS for different serviceconditions. The description of an electrotechnical product as being of a particular thermal class does not mean,and must not be taken to imply that each insulating material used in its construction is of the same thermalcapability.
relative thermal endurance indexRTE
numerical value of the temperature in degrees Celsius at which the estimated time to endpointof the candidate material is the same as the estimated time to endpoint of the control materialat a temperature equal to its assessed thermal endurance (ATE)
assessed thermal endurance indexATE
numerical value of the temperature in degrees Celsius，up to which the control materialpossesses known,satisfactory service performance in the specified application
NOTE 1 The value of the ATE may vary between applications for the same material.
NOTE 2 Sometimes referred to as “absolute”thermal endurance index.
material for which an estimate of the thermal endurance is required to be determinedNOTEThe determination is made by simultaneous thermal ageing of the material and a control material.