UL is working hard to bring cutting edge educational training opportunities to the building and life safety industries. Over the past few months, we have released the following online training modules: • Pipes and Fittings for Use in Fire-Service Systems • Valves for Use in Fire-Service Systems • Fall Protection Product Certification • UL Certification… read more
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Understanding fire suppression (control or extinguishment) requires a basic knowledge of fire and the method(s) used by the agent to suppress fire. Fire produces heat during combustion, which is the rapid chemical chain reaction of a fuel combined with oxygen. These four factors are often represented visually as the fire tetrahedron (Figure 1). Water, the… read more
Background UL Safety Standards UL 2157, 3rd edition, Electric Clothes Washing Machines and Extractors, and UL 2158, 4th edition, Electric Clothes Dryers, provide three methods to comply with entrapment requirements and a manufacturer can choose either one of these methods to evaluate their appliance. One of these methods is found in Clause 15.6.1.b) (UL 2157)… read more