6 Evaluation Questions for Selecting an Enclosure Air Conditioner Supplier


When you are selecting an enclosure air conditioning supplier, you’ll want to make sure the supplier is capable, competent, and that their equipment meets your requirements. So, before placing an order, spend a little time evaluating potential suppliers to make sure you select one that will deliver the quality you need. Continue reading

Why You Need More than Just a Cabinet Cooling Fan for Electrical Drives

It is generally acknowledged that both AC and DC electrical drives operate at very high efficiencies (≥95% for AC and ≥98% for DC). However, even these high efficiencies leave losses manifested as heat dissipation. Along with the many pros and cons for the two drives, the type of enclosure required is often a major factor in making a final choice. For both AC and DC drives, the heat generated makes it important to carefully consider the sizing of enclosures utilized, as well as how those enclosures are ventilated and/or cooled.

Continue reading

5 Reasons You Need a Reliable Cooling System for Electronic Enclosures


No one needs to be told how much time, effort and of course money accompanies the systems needed to keep a business running smoothly. Ensuring that pricey electrical equipment, servers and security systems that drive production remain operational is no longer a secondary task. It is a critical business function, and even a matter of public and employee safety. Continue reading

4 Enclosure Cooling Methods that Prevent Plant Shut-Down


In industrial facilities, electronic equipment is frequently used for motor control, and most machines are PLC controlled. This use of electronic equipment has increased electrical enclosure heat loads because of the high heat dissipation characteristics of electronic equipment. At the same time, electronic equipment is susceptible to malfunction if allowed to get too hot, so it is widely accepted that electrical enclosure temperatures are kept below 100 ºF (37 ºC) to limit the possibility of unpredictable behavior or failure that could lead to a plant shut-down.

Continue reading

3 Steps to Prevent Corrosion in Electrical Enclosure Cooling Systems

Environmental and climate conditions can negatively affect electrical enclosures in several ways. Beside the negative effects of excessive heat, dust and dirt, and the formation of corrosion is an issue that can plague enclosures. Corrosion doesn’t form without a reason; excessive condensation is most often the primary contributor to the formation of corrosion within enclosures.

For the electrical components within the enclosure, the formation of corrosion can reduce electrical continuity and the lifespan of the electrical connections leading to short circuits and breakdowns. Continue reading

Common Enclosure Cooling Mistakes in the Food and Beverage Industry

To the outsider, the food and beverage industry operates in a benign and clean environment. Although this assumption is largely true, it requires that facilities are rigorously cleaned and high standards of hygiene maintained. Cleaning processes include the use of chemical disinfectants and washdowns to prevent pathogens accumulating on any surface. Since the introduction of the Food Safety Management Act, the FDA Code of Federal Regulations Title 21, Part 110 was updated and requires that equipment in manufacturing and food handling areas is constructed so it can be kept in a clean condition, even if it doesn’t come into direct contact with food.

Continue reading

8 Cabinet Cooling Fan Failures To Avoid At All Costs

Almost everyone involved in the maintenance of electrical enclosures has, at one time or another, faced problems with overheated electrical enclosures. In most instances, the obvious solution was to install or upgrade the cabinet cooling fan only to find that it didn’t work too well.

Here are some reasons why the obvious solution may not have worked. Continue reading

Differences Between UL & cUL Requirements for Electrical Enclosure Cooling Systems

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. Although there are many obvious similarities, UL and cUL requirements for electrical enclosure cooling are not the same.

UL Mark

The Underwriters Laboratories UL mark applies to products that have been designed and approved for the US market and have received specific Underwriters Laboratories certification that they comply with the respective US standards. These are specified in ANSI/NFPA 70, the National Electrical Code and, more specifically, the ANSI/UL 484 standard for special purpose air conditioners.

cUL Mark

The cUL mark applies to products intended for the Canadian market that have been tested and found to comply with the requirements of CAN/CSA 22.1-12, which is the Canadian Electrical Code issued by the Canadian Standards Association. Included in this code under section 22.2 are two sections, numbers 236-M90 and 117 that deal with heating and cooling equipment and special purpose air conditioners.

UL and cUL are Not the Same

The two marks are not the same and may not be used interchangeably. However, there are many similarities and equipment that has been tested under one standard may well comply with the other. Although the respective national standards have many similarities, it is important to note there are many detailed differences. For example, Canadian codes reflect a stronger European influence as can been seen in the frequent reference to IPXX enclosure protection ratings in Canada, although the US NEMA enclosure ratings are also used.

Obtaining UL and cUL Certification

Manufacturers who sell internationally need to obtain certification that gives them access to the US, Canadian, and other markets. It is costly to obtain certification from a testing laboratory and Underwriters Laboratories has prepared harmonized standards that can be used to design and manufacture equipment to comply with both the UL and cUL requirements. These standards are:

  • UL 50 Enclosures for Electrical Equipment: The standard is applicable to electrical enclosures intended for installation in terms of the Canadian Electrical Code, Part 1 (CSA 22.1), The National Electrical Code (NFPA 70), and Mexico’s Code for Electrical installations. There are some exceptions detailed in the standard.
  • UL 248-1 Low-voltage Fuses: This standard covers the requirements of the three North American countries.

Unified Testing

When new products are introduced, or it is desired to obtain approval for existing products, Underwriters Laboratories is able to perform unified testing to verify compliance with the Canadian and US standards. This approach is a cost effective way to obtaining UL and cUL approvals.

Buy Electrical Enclosure Equipment That Meet Local Requirements

Many local authorities in the US and Canada require that electrical enclosures and enclosure air conditioners comply with national standards and carry an appropriate certification from a recognized testing laboratory. It should not be assumed that an item carrying a cUL mark is acceptable in the US or an item carrying the UL mark is acceptable in Canada. Thermal Edge’s range of enclosure air conditioners complies with the UL, cUL and CE (European) requirements thus meeting local authority requirements. Contact Thermal Edge for further information.