Why GFCI Devices Appear Warm (to a Thermal Infrared Imager)

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Thermogram shows normal thermal pattern for GFCI receptacle under no load conditionOnline — When performing an infrared inspection of an electrical panel you may notice that the phenolic bodies of Ground Fault Circuit Interrupters (GFCI) appear warm. This same condition may also be observed on self-contained GFCI receptacles.

This condition is usually due to the construction of the device itself.

In order to monitor the amount of current flowing through the supply and neutral conductors of a circuit, GFCI devices have small transformers built into them.

These transformers can cause the body of the GFCI to run several degrees warmer than ambient temperature.

Depending upon the settings of your thermal imager, these devices may show a marked contrast to their surroundings.

Read the whole tip online at: https://www.irinfo.org/archive-tip-of-the-week-2018-jan-june/#t06112018

IRInfo Tip of the Week is a publication of the Infraspection Institute.