SURFACE TEMPERATURE TEST METHODS PER IEEE 1349

摘要

The Fine Print Note [FPN] No.1 in 2005 NEC Article 501.8 (B) [1] cautions users to "consider the temperature of internal and external surfaces that may be exposed to the flammable atmosphere" when putting a motor into service in a Class I,Division 2 environment.Thus it is critical that manufacturers and users of industrial electric motors understand that internal peak temperatures exceed the external peak temperatures.This paper presents three common IEEE 1349 [2] test methods used by manufacturers to determine these internal peak temperatures.Potential test method error and the test results from the three test methods are also presented.IEEE 1349 [2] provides only guidance when performing these test methods so this paper intends to provide additional clarification.The test motors presented in this paper are low voltage,AC induction,severe-duty,energy-efficient,TEFC motors commonly used in the "Petrochemical Industry".