42 infrared and manual inspection of electrical equipment in power stations, substations and switchgear, namely, transformer reactors, voltage regulators, transmission lines, switchboards, switches, circuit breakers, relays, fuses, motor controls, motors, cables, capacitors and bus ducts; infrared inspection of mechanical equipment, namely, boilers, chillers, ovens, furnaces, pipes, cryogenic vessels, buildings, heat exchangers, bearings or other such equipment; and infrared inspection of building roofs