Eaton’s electronic terminal blocks comply with the requirements in IEC Publication 60947-7-1, Terminal Blocks for Copper Conductors. These blocks are concurrently recognized and certified under the UL Classification Program. Details of the IEC rating system is provided on the following page. Ratings, except where indicated, are concurrent with UL 1059.
In 1998, Eaton received CE certification on all products. For terminal blocks, CE is a self-certification mark applied to products that have met safety and performance requirements set forth by the European Union (EU). This mark is required for free movement of product in the European market.
Similar to UL1059 Classes, IEC 60947-7-1 refers to IEC60947-1 which outlines the general rules for low-voltage switchgear and control gear as well as defines creepage and clearance limits based on pollution degrees. The pollution degree refers to the environmental conditions for which the equipment is intended.
The micro-environment of the creepage distance or clearance, and not the environment of the equipment, determines the effect on insulation. The micro-environment might be better or worse than the environment of the equipment. It includes all factors influencing the insulation, such as climatic and electromagnetic conditions, generation of pollution, etc. Therefore, for equipment intended for use within an enclosure or provided with an integral enclosure, the pollution degree of the environment in the enclosure is applicable.
For purposes of evaluating clearances and creepage distances, the four degrees of pollution of the micro-environment are established:
- Pollution degree 1: No pollution or only dry, non-conductive pollution occurs.
- Pollution degree 2: Normally, only non-conductive pollution occurs. Occasionally, a temporary conductivity caused by condensation may be expected.
- Pollution degree 3: Conductive pollution occurs, or dry, non-conductive pollution occurs which becomes conductive due to condensation.
- Pollution degree 4: The pollution generates persistent conductivity caused, for instance, by conductive dust or by rain or snow.
Pollution degree 3 is the standard pollution degree for industrial applications, unless otherwise stated by the relevant product standard. However, other pollution degrees may be considered to apply depending on the particular application or micro-environment.
Impulse withstand voltage – highest peak value of an impulse voltage, of prescribed form and polarity, which does not cause breakdown under specified test conditions.