Hazardous locations rebuilt control equipment program
The UL Listing Mark on a newly manufactured piece of equipment indicates compliance with nationally recognized safety requirements. A device with a UL Listing mark that has been subsequently "rebuilt" is an entirely different story. Whether it's due to previous damage, or due to the rebuilding process itself, modifications make continued compliance with UL requirements uncertain. In response to these concerns, UL's HazLoc engineering staff establish certification programs to determine whether or not any piece of rebuilt equipment continues to comply with the applicable UL HazLoc requirements.
UL has a number of active certification programs for rebuilt hazardous locations equipment (also referred to as reconditioned, remanufactured or refurbished equipment). The most common of these address HazLoc industrial and process control equipment (including programmable logic controllers, auxiliary devices, and magnetic motor controllers) and HazLoc motors and generators. As the need arises, additional rebuilt programs for other UL HazLoc equipment can be established.
Regarding the UL program for rebuilt industrial and process control equipment, such equipment may be factory reconditioned, to the extent necessary by disassembly and re-assembly, using new or reconditioned component parts. This reconditioned equipment shall be subjected to the same requirements as new equipment. The basic requirements for these rebuilt control equipment programs are contained in the following UL HazLoc standards:
| Standard | Title |
| UL 698 | Industrial Control Equipment for Use in Hazardous (Classified) Locations |
| UL 1203 | Explosion-Proof and Dust-Ignition-Proof Electrical Equipment for Use in Hazardous (Classified) Locations |
| UL 913 | Intrinsically Safe Apparatus and Associated Apparatus for Use in Class I, II, and III, Division 1, Hazardous (Classified) Locations |
| UL 1604 | Electrical Equipment for Use in Class I and II, Division 2, and Class III Hazardous (Classified) Locations |
| UL 2279 | Electrical Equipment for Use in Class I, Zone 0, 1 and 2 Hazardous (Classified) Locations |
Also, the UL follow-up service procedures for rebuilt equipment under these programs includes periodic visits from a UL field representative to verify that all of the requirements continue to be met.
Regarding the UL program for rebuilt motors and generators, this is by far UL's most active program for the rebuilding of HazLoc equipment. There are over 600 companies throughout North America, Europe, Asia and Latin America authorized by UL to rebuild UL HazLoc motors and generators. The basic requirements for this program are contained in UL 674, Electric Motors and Generators for Use in Division 1 Hazardous (Classified) Locations. Learn more about UL's HazLoc rebuilt motor program.
