Relation to UL
The Industrial Control Panel Enclosure is a control cabinet that protects electrical equipment for various applications. Its design must comply with the requirements of UL 508A. Among other things, it is essential to consider the space inside the ICP and the placement of the individual components within the enclosure.
What is an industrial control panel enclosure?
The term “industrial control panel enclosure” refers to the housing for industrial control panels. If the industrial control panel is already installed inside the enclosure, the assembled unit is called a control cabinet.
What does the Industrial Control Panel Enclosure do?
An enclosure, or electrical enclosure, is a cabinet or box that protects electrical or electronic devices and prevents electric shock. It can be made of rigid plastic or metals such as steel, stainless steel, or aluminum. The industrial control panel enclosure is designed to provide protection against hazardous, non-hazardous, and other specific environmental conditions.
These enclosures protect electrical devices used in a wide variety of applications in buildings and in industry. They can also shield devices from electromagnetic and high-frequency interference. Above all,
- Circuit Breakers, Contactors, and Switches
- Distribution Panels and Control Panels
- Pressurization and Venting Devices
- Phone Booths
Housing Evaluation
Industrial control panels consist of power and/or control circuits that provide the signals needed to control the operation of machines or devices. They do not contain either the main power supply or the devices being controlled. Depending on the application, the industrial control panel is mounted on a backplate, a base plate, or inside an enclosure.
Industrial control panel enclosures are tested only for their design. Their construction must comply with the UL 508A standard, but they are not tested for compatibility with electrical components. It is important to select a suitable enclosure, as any improper configuration can lead to machine malfunctions and also pose an unnecessary risk to operators.
For enclosure ratings, UL (Underwriter Laboratories Inc.) provides the UL Type Rating in accordance with UL 50E. The types are listed in the following table.
Similar to other industrial equipment, ICPs can be certified as open-type or enclosed-type. Open-type devices are installed in an enclosure before being put into service. Enclosed ICPs can be classified for indoor use or for any type rating, such as 3R, 4, or 12. In addition, they can also be certified for use in classified areas, such as hazardous locations.
Enclosure Requirements
There must be enough space inside the enclosure to install and wire components. Several power outlets should be included in the design to provide power to any test equipment.
The placement of the components must also be carefully considered. For example, if a cabinet enclosure is used, the space required for the cabinet doors to swing open should be factored into the design.
If the ambient temperature is very high, a fan or air conditioning system may be necessary to keep the switchgear within an optimal operating temperature range. If a fan or air conditioning system is used, easy access to the air intakes and exhaust vents is required. This also allows any filters to be replaced without difficulty. In addition, sufficient space for ventilation should be provided. The National Electrical Code (NEC) specifies the required clearance around electrical cables. UL also requires a specified clearance around heat-generating equipment.
In addition to space for the current configuration, sufficient room should also be planned for potential future requirements. When retrofitting, limited space is often the biggest challenge.
Overall, considerations regarding the size of the enclosure and the placement of components are a very important detail during the planning phase. It is no coincidence that industrial control panel enclosures that are too small or too cramped to allow sufficient space for wiring and wire bending are among the most common NEC violations related to switchgear.
Zusammenfassung
The enclosure for industrial switchgear is referred to as an Industrial Control Panel Enclosure. Like control cabinets, these enclosures must also comply with the NEC and UL 508A, but they are not tested for compatibility with electrical components. They provide protection for a wide variety of electrical devices, such as circuit breakers or control panels. The UL Type Rating according to UL 50E is used to evaluate enclosures; enclosure types are classified there. Depending on the application (and location), the enclosure must meet specific requirements. For example, sufficient space for the individual components and their proper placement must be ensured. Incorrect sizing of industrial control panel enclosures is actually one of the most common NEC violations related to switchgear.
