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 industry's 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.
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