Infrared thermography has become a well-established and proven method for inspecting live electrical equipment
. To carry out tests, the thermographer usually works with live energized equipment and requires a clear line of sight to the target. Thermographers must therefore be especially aware of the hazards, the legislation and safety issues, and the techniques and equipment best suited to minimizing the risks when working in these dangerous environments.
The installation of IR windows, panes or ports allows a thermographer to inspect live electrical equipment without the removal of protective covers and the exposure of equipment.
An Infrared window provides a solid barrier between the thermographer and the live conductors. By careful design, it is possible not only to reduce the trigger effects of an arc but also provide the thermographer with a far safer working environment.
Infrared windows are constructed of crystal optic materials designed to better protect the thermographer under an arc-flash condition during scheduled, periodic inspection of the internal equipment. Inspection devices may also feature locking security covers. This ensures only a trained and authorized person can remove and complete an inspection or scan. It also protects the optic material from day-to-day impacts and offers further arc-flash protection.
The strength of crystal infrared window optics has been increased to such an extent that they can withstand the effects of an arc fault. With the adoption of NFPA 70E and the industrys focus on arc-flash safety, installing a product that can withstand arc-flash should be a primary concern for any end-user.
In addition, when selecting an IR window or port an end-user must consider the electrical implications of the installation and insist on third party certification to back up any manufacturer claims.
Finally, an optic material that may melt during an arc flash and cause contact burns could be more hazardous to a thermographer than simply having the panel open for the measurements. A true arc-tested optic should be used in order to demonstrate due diligence.
For more information please visit http://us.fluke.com/fluke/usen/Products/IR-Windows or call 1-800-760-4523.