Although much of the available wire and cable is rated 90C, and many connectors are rated at 90C, equipment such as panelboards, switchboards and similar equipment is typically limited to 75C. For example, UL 67 has provisions for testing with 60C and 75C wire, but not 90C wire. Allowable conductor ampacity should be based on the "weakest link" temperature - which is often that of the equipment where it terminates. If you are using wire or cable with a 90C temperature rating, the corresponding ampacity may be used for temperature correction or adjustment, but the final ampacity must not exceed that found in the temperature column corresponding to the marking on the equipment.
2014 NFPA Conference Resources 6/12/14
The 2014 NFPA Conference & Expo is drawing to a close today in Las Vegas, Nevada. Over 150 educational sessions were presented, and the membership welcomed our new incoming president, Jim Pauley. If you missed the conference, you can still review many of the presentation materials by downloading the 2014 NFPA Conference & Expo mobile app. Click on the session topic of interest and look under the “Resources” tab to find presentation materials.