[Code of Federal Regulations]

[Title 46, Volume 4]

[Revised as of October 1, 2005]

From the U.S. Government Printing Office via GPO Access

[CITE: 46CFR111.20-5]



[Page 222]

 

                           TITLE 46--SHIPPING

 

   CHAPTER I--COAST GUARD, DEPARTMENT OF HOMELAND SECURITY (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.