Reference temperature
Reference temperature means 20 C for no-load loss, 55 C for load loss of liquid-immersed distribution transformers at 50 percent load, and 75 C for load loss of both low-voltage and medium-voltage dry-type distribution transformers, at 35 percent load and 50 percent load, respectively. It is the temperature at which the transformer losses must be determined, and to which such losses must be corrected if testing is done at a different point. (These temperatures are specified in the test method in appendix A to this part.)
Source
10 CFR § 431.192
Scoping language
The following definitions apply for purposes of this subpart: