{"id":12702,"date":"2024-03-20T16:36:09","date_gmt":"2024-03-20T15:36:09","guid":{"rendered":"https:\/\/b3v39j.myrdbx.io\/ul-wissen\/ul-wiki\/control-cabinet-for-the-u-s\/"},"modified":"2026-07-31T19:57:25","modified_gmt":"2026-07-31T17:57:25","slug":"control-cabinet-for-the-u-s","status":"publish","type":"wiki","link":"https:\/\/krayer.de\/en\/ul-wissen\/ul-wiki\/control-cabinet-for-the-u-s\/","title":{"rendered":"Control Cabinet for the U.S."},"content":{"rendered":"\n

A control cabinet for the U.S.<\/strong> essentially serves the same purposes as its counterpart for the European market. It houses the electrical and electronic components that cannot or should not be installed in the system or machine itself. The main differences<\/strong> lie not in the functions of an American control cabinet, but in the safety requirements<\/strong> imposed on it and the testing procedures for those requirements. <\/p>\n\n

Relation to UL<\/h2>\n\n

Switchgear and control cabinets for the U.S. should be designed and manufactured by an expert to ensure that all requirements\u2014which are often hidden in the details\u2014are met. This is the only way to ensure that the rest of the project proceeds smoothly in the U.S. <\/p>\n\n

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Requirements for Control Cabinets in the United States<\/h2>\n\n

The requirements<\/strong> for control cabinets<\/a> in the U.S. differ, in some cases significantly, from those to which control cabinet manufacturers and their customers in Europe are accustomed. Of course, we can only provide a brief overview<\/strong> here of the differences that exporters most frequently notice when they first enter the North American market. <\/p>\n\n

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Fire Safety<\/h3>\n\n

In the United States, fire safety<\/strong> for electrical systems is considered far more important than in Europe. This is due to historical reasons: When the first electrical devices appeared, the fire hazard they posed was considered at least as great as the risk of accidents. <\/p>\n\n

Interlock<\/h3>\n\n

While fire safety regulations in North America are stricter than in Europe, control cabinets there are often not required to be as touch-safe<\/strong> as they are here. Instead, a so-called interlock<\/strong><\/a> ensures that no cabinet door can be opened as long as the components inside are still energized. <\/p>\n\n

Clearances and Creepage Distances<\/h3>\n\n

For control cabinets intended for the United States or Canada, it is essential to ensure compliance with the clearances and creepage distances<\/strong>, as these are closely inspected during on-site acceptance testing.<\/p>\n\n

Protective components<\/h3>\n\n

There are also significant differences when it comes to protective components<\/strong>. A control cabinet intended for the U.S. not only requires more protective components to meet legal requirements, but some of these components are also larger than those typically used in Europe. <\/p>\n\n

Electric Circuits<\/h3>\n\n

One safety measure that is completely unknown in the EU\u2014and which also increases space requirements\u2014is the separate routing of certain electrical circuits<\/strong>. For example, the feed-in cable must neither cross nor intersect the other electrical circuits. <\/p>\n\n

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What laws and standards govern the requirements for electrical control cabinets in the United States?<\/h2>\n\n

The requirements for a control cabinet intended for use in the United States are primarily derived from two sets of regulations. One is the National Electrical Code<\/strong> (NEC), which includes specifications for evaluating short-circuit withstand capability (see SCCR<\/a>) and requirements related to explosion protection. In addition, the NFPA 79<\/a> standard from the National Fire Protection Association<\/strong> (NFPA) is particularly important, as it specifies, among other things, the requirements for design, wiring, grounding, and labeling. <\/p>\n\n

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