A lot of the time, the UL Recognized EIS that you want to adopt will not have all of the components that you use. In that case, you will need to modify the EIS. This can usually be accomplished by means of a Sealed Tube Chemical Compatibility Test (CCT). A basic project will cost about $3,500 to $5,000 in addition to UL project fees, while a more complex project involving several different candidate tubes can multiply the costs rapidly. The test procedure itself only takes two weeks to complete.
However, there are limitations as to which materials can be added to an established EIS by the sealed tube test method:
- Different magnet wires (MW)may not be added. Only the MW tested in the original EIS, or an MW from the same family with a higher thermal rating, may be used (see Appendix A in UL 1446).
- Only the major ground insulation materials evaluated in the original EIS, e.g., flexible sheet insulation or bobbin material, may be used.
- Varnishes may be added via the sealed tube test method provided they meet the proper criteria, twisted pair (TP) and helical coil (HC) ratings on the MW used in the EIS (see Section 8.4 in UL 1446).
- All minor components may be added via the sealed tube test method without regard to their thermal rating. For example, a polyester film-backed PS tape can be added to a Class 220(R) EIS even though polyester film has a component rating of 130(B).
» >> Continue with "What is a Sealed Tube Chemical Compatibility Test?"