What is DD IEC/TS 60815-3 - Polymer insulators for a.c. systems about? 
DD IEC/TS 60815-3 is a technical specification with the objective to give the user the means to determine the reference unified specific creepage distance (USCD) from site pollution severity (SPS) class, choosing appropriate profiles, apply correction factors for altitude, insulator shape, size and position, etc. to the reference USCD.
DD IEC/TS 60815-3 is a part of the IEC/TS 60815 series and gives specific guidelines and principles to arrive at an informed judgement on the probable behaviour of a given insulator in certain pollution environments. DD IEC/TS 60815-3 guideline is detailed information about the performance of insulators under pollution.
Note: DD IEC/TS 60815-3 does not deal with the effects of snow or ice on polluted insulators.
Who is DD IEC/TS 60815-3 - Polymer insulators for a.c. systems for?
DD IEC/TS 60815-3 - polymer insulators for a.c. systems are useful for:
- Powergrid station
- Telecommunication manufacturer
- Electronic appliances manufacturer
- The thermoplastic industry
- The electrical industry
Why should you use DD IEC/TS 60815-3 - Polymer insulators for a.c. systems? 
Polymer type insulators have high resistance to high voltage power. However, mishandling of the polymer insulator can lead to danger to life, capital and property.
DD IEC/TS 60815-3 guidelines provide a technical specification about the selection of polymer insulators for a.c. systems, and the determination of their relevant dimensions that are used in high voltage systems with respect to pollution.
Using best practice DD IEC/TS 60815-3 guidance can increase the credibility of the equipment and safety and protection as well. 
