Motorola Solutions FM To UL Transition


When you’re operating in environments where flammable or explosive gases, vapors or dust may be present, you should consider communications equipment certified for use in a Hazardous Location – often called “HazLoc”.


The established Factory Mutual standard FM3610_88 expired in 2012. Radios certified to FM3610_88 will be phased out of production in December 2015. Motorola will be adapting to a new TIA-4950 standard for Hazardous Location certification of two-way radios, which is similar to the FM3610_88 standard. Compliance testing will be done by UL (Underwriters Laboratories).

FM approved radios that are deployed in the field will maintain their FM Intrinsically Safe approval status, provided that any service and repairs are done at an FM audited repair facility.


ASTRO 25™ and MOTOTRBO™ Radios and batteries certified to TIA-4950 have been available since Q1 2015. They are labelled clearly with the new UL markings.


Ensure that your facility documentation defines Hazardous Location requirements in terms of Division, Class and Group rather than simply "FM Approved" or "Intrinsically Safe". Knowing the specific Hazardous Locations classification is important in selecting equipment that is approved for use in those environments.

*TIA: Telecommunications Industry Association


Hazardous locations can be found in many industries, including refineries, fuel storage facilities, chemical plants, grain elevators and plastics processing plants. The National Electrical Code (NEC) NFPA 70 defines hazardous locations as areas "where fire or explosion hazards may exist due to flammable gases or vapors, flammable liquids, combustible dust, or ignitable fibers or flyings."

Equipment manufacturers do not determine the need for “HazLoc” products, or evaluate the environment in which the radios will be used. The Hazardous Location classification is determined by the Authorities Having Jurisdiction (AHJs) over the particular facility, for example the fire marshal, insurance provider or facility safety expert.



  • Class I: Flammable Gases, Vapors, or Liquids
  • Class II: Combustible Dust
  • Class III: Ignitable Fibers and Flyings

Division (Area Classification)

  • Division 1: Locations where ignitable gas/vapor/liquid/dust are present continuously or some of the time under normal operating conditions
  • Division 2: Locations where ignitable gas/vapor/liquid/dust are not likely to exist under normal operating conditions

Groups (Organized by Classes)

Class I Gas Groups

  • Group A - Acetylene and equivalent gas groups
  • Group B - Hydrogen and equivalent gas groups
  • Group C - Ethylene and equivalent gas groups
  • Group D - Methane and equivalent gas groups

Class II Dust Groups

  • Group E - Conductive dust (mechanical – factories, recyclers)
  • Group F - Combustible carbon dust (charcoal & coke dust) - above ground only
  • Group G - Grain dust

Class III Fibers has no sub-groups

Motorola Solutions FM to UL table

For more information, please contact us