Selecting the Right Electrical Insulation System

Choosing the right electrical insulation system can seem complicated. To help you, we have outlined the key steps and decision areas below.

1. Decide if your electrical product needs an EIS.
   
   
2. Determine which "class" of systems recognition your product requires. EIS classes are based on the maximum "hot spot" in the system. Your choices are Class 130, Class 155, Class 180, Class 200, and Class 220.
   
   
3. Decide if your application requires an EIS for use in an "open to the atmosphere" application such as a transformer, relay, contactor, and most motors or whether you need an EIS for encapsulated applications such as a solenoid, fully encapsulated transformer or encapsulated motor stator or others. If your product requires an EIS for an "Open" application, please check the table in (4) below for ground insulation. Follow this link if you need an EIS for encapsulated systems.
   
   
4. Check the table below for DuPont ground insulation materials used in IEC/UL compliant "Open to the Atmosphere" EIS and the thermal classes the EIS are recognized to. Then go to the EIS Listings Database.
   
   

   	TYPE OF SYSTEMS
   GROUND INSULATION MATERIAL	Class 130	Class 155	Class 180	Class 200	Class 220
   with Zytel® PA 66 nylon	available	available	- -	- -	- -
   with Rynite® PET	available	available	available	available	- -
   with Crastin® PBT	available	available	- -	- -	- -
   with Zenite® LCP	- -	available	available	- -	available
   with Zytel® HTN nylon	available	available	available	- -	- -
   with Mylar®	available	available	- -	- -	- -
   with Nomex®	available	available	available	available	available
   with Kaladex®	- -	available	- -	- -	- -
   Encapsulated Applications available in EIS for Encapsulated Components

5. While you are in the EIS Listings Database, check on the varnish, if any, you would like to use. You can then access the information on this varnish and the company that makes it by clicking on the link "Suppliers of Coil Bobbins, Wires, Varnishes, Resins, and EIS testing.
   
   
6. To receive authorization on-line for EIS, simply request authorization while in the EIS Listings Database. We will write a letter to you with a copy to the standards agency of your choice, for example UL, authorizing the use of the EIS. If you need further assistance, please contact one of our regional offices listed on the DuPont Materials for EIS page.
   
   
7. Construct your electrical product and contact UL or other regulatory laboratory to get whatever other approvals are required.
   

Caution

Once you are using a recognized EIS, you cannot substitute a component in the system without notifying UL and retesting your product. Also, you cannot substitute another plastic coil bobbin for the one in your system. For example,if you are using a coil bobbin molded from DuPont™ Zytel® 70G33L, the EIS requirements will not permit you to use a bobbin molded from any other company’s polyamide. You MUST make certain that your molder does not change plastics without notifying you and UL. If a new material is substituted, it must be part of an EIS listed at UL, and your product will need to be retested.

DuPont and EIS | EIS Explained | DuPont Materials
Selecting the Right EIS | Encapsulated Components | Wire Substitutions