UL stands for Underwriters Laboratories in the United States, and the initials UL represent their mark of approval. UL has laboratories in several other countries, and in Canada their mark of approval is cUL.
Underwriters Laboratories belongs to a group of nationally recognized testing laboratories; organizations that are accepted by authorities having jurisdiction (AHJs) in terms of the US National Electrical Code to certify equipment as meeting certain specifications. In simple terms, the UL label in the USA and cUL label in Canada on electrical products indicate that the products have been designed, built, and tested to be in accordance with safety standards for those respective countries by Underwriter Laboratories.
The market for custom cabinet or enclosure air conditioners is growing as applications become more unique, such as pole mounted heavily loaded electrical cabinets, mobile equipment, and electrical control panels in dusty areas with intense solar radiation.
Outdoor electrical enclosures can be found in applications such as security systems, digital signs, telecommunications, and any other situation when electrical components are present. When selecting a cooling system for an outdoor electrical enclosure, you must consider a few factors that do not exist for indoor applications. Failure to take every potential scenario into account could result in a cooling solution that is not appropriate, and worse, possibly not up to the task.
Keeping your electrical enclosures cool is absolutely essential in the telecom industry. Heat is produced not just from the electrical equipment inside the enclosure, but also develops from solar radiation. A reliable and efficient air conditioner to keep your outdoor electrical enclosures at ideal operating temperatures does not have to be unbearably expensive or difficult to maintain.
For obvious reasons, security and surveillance equipment is designed to be reliable. However, security systems are only as good as their weakest links, which could be cabinet cooling systems if you are not careful. As heat is generated by cameras, recording devices, communication systems and other electronic equipment, the risk of failure increases if an adequate cooling solution is not in place.
Electrical enclosures are generally designed to allow cooling by natural ventilation, supplemented sometimes by forced ventilation. This usually works well, but there are situations when overheating of electrical panels occurs due to internal heat load, environmental, ventilation, and air flow capacity constraints.
Electrical cabinet cooling systems are designed to maintain internal electrical enclosure temperatures so as to ensure electrical equipment inside the enclosure remains below maximum design temperatures. Research shows the life expectancy of electrical equipment is halved for every 18 ºF increase in temperature. So, it's imperative to provide cabinet cooling systems for electrical enclosures subject to high heat loads, especially those enclosures situated in locations where natural cooling is ineffective or exposed to dust and chemical pollution. In order to reduce running costs and to ensure proper cooling, high efficiency cooling systems should be used.