7anoter4, Thank you for your reply. I start to understand the application of transformers and would size such secondary feeders for continuous duty at the largest Rated KVA.
Have searched all over for written standard that specifically addresses sizing the Secondary conductors for OA/FA/FOA, 55 / 65 C. TRANSFORMER.
I have been unable to find anything. Logic would suggest the max load would be fixed for the OA Rated KVA.
And the FA/ FOA RATING IS FOR AMBIENT...
Davidbeach, thank you that makes me in agreement with you. How would you size the secondary feeders and have you a technical reference for support. Love this forum.
Thank you for your answers. I understand the Transformer Impedance is Given with the Transformer and the available short circuit current is calculated using the base Rated KVA I,e OA Rated KVA. I understood the normal design load on the transformer was based on the OA Rated KVA. The max motor...
Have searched all over and can find no technical answer. If the Transformer is rated as OA/FA/FOR, 55 / 65 C. WOULD YOU ASSOME THE FOA KVA RATING WOULD BE REQURED FOR 3 HOURS OR MORE AND SIZE THE SECONDARY FEEDER CONDUCTORS AT. FOA. KVA. AMPS x 1.25 %. and can the Rated KVA at FA rating be used...