Most electrical failures can be prevented by early detection. Often visual inspections will not provide enough contrast to sense system component overheating, however with a skilled thermographer equipped with the appropriate equipment can provide the information you need to keep your electrical distribution system safe.
One Challenge for thermographers is maintaining safe clearance to the energy while still getting adequate images that decisions can be based on. In order to provide this protection a couple of companies are starting to produce ports that can be installed in the switchgear panels and doors that would allow thermographers to capture these images without exposing thermographers to the dangers of electrical energy.
http://www.flirthermography.com/accessories/accessory/1221/accessory_category_id/1030/