[Code of Federal Regulations]
[Title 46, Volume 4]
[Revised as of October 1, 2002]
From the U.S. Government Printing Office via GPO Access
[CITE: 46CFR111.20-5]

[Page 224]
 
                           TITLE 46--SHIPPING
 
    CHAPTER I--COAST GUARD, DEPARTMENT OF TRANSPORTATION (CONTINUED)
 
PART 111--ELECTRIC SYSTEMS--GENERAL REQUIREMENTS--Table of Contents
 
 Subpart 111.20--Transformer Construction, Installation, and Protection
 
Sec. 111.20-5  Temperature rise.

    (a) The temperature rise, based on an ambient temperature of 40 
degrees C, must not exceed the following:
    (1) For Class A insulation, 55 degrees C.
    (2) For Class B insulation, 80 degrees C.
    (3) For Class F insulation, 115 degrees C.
    (4) For Class H insulation, 150 degrees C.
    (b) If the ambient temperature is higher than 40 degrees C, the 
transformer must be derated so that the total temperature stated in this 
section is not exceeded. The temperature must be taken by the resistance 
method.