Explosion Proof exit signs are available in Class 1 division 1 and Class 1 division 2 conditions. Designed for hazardous locations that produce combustible gases and vapors, these fixtures have airtight housings to protect internal circuitry, which pose a sparking hazard that could cause an explosion. Hence the name 'explosion proof.'
Divisions refer to the likelihood of such gases being present in day-to-day operations. Division 1 is the most serious environment, as these gases are always present. Division 2 areas don't usually contain flammable agents, though sudden introduction could occur at any time.
Explosion proof exit signs have flame and impact-resistant cast aluminum housings with a gasketed access panel that creates a hermetic seal over the inner circuitry. The 'exit' lettering is protected by a clear shatter-resistant polycarbonate faceplate and fastened by stainless steel screws.
Explosion proof exit signs are lit by an LED (Light Emitting Diode) strip and uses only 5 watts of electricity. They are available in red or green options. These models include an automated self-diagnostic that greatly reduces maintenance time and cost. An LED display gives a visual readout of the unit's battery and overall readiness.
Nickel Cadmium (NiCad) battery will light these exit signs for a minimum of 90 minutes during a power failure. The expected lifespan of NiCad batteries is 5-7 years.
AC-only models have no battery at all and are available for facilites with external emergency battery power.
PARTS - Three-year warranty on parts
BATTERY - four-year prorated warranty on lead calcium battery, five-year for nickel cadmium
Periodic testing must be performed at monthly and yearly intervals if the self-diagnostic option is waived. This ensures the lamps and battery will work properly during a power failure.
8-10 year expected lifespan. Replacement components are available.
Internal Battery Heater - Enables the battery backup to operate in below-freezing temperatures.
Self-Diagnostic - This option drastically reduces maintenance needs. An LED display gives constant status reports on the unit.
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