Industrial control panel design is a process that requires an enormous amount of attention to detail. Montana Controls offers full control panel manufacturing services for use in a wide variety of industrial applications. In order to ensure that the appropriate industrial control panel is used for the intended purpose, it is essential to understand the applications and limitations of various control panel listings and their corresponding markings as determined by UL 508A. It is only after the proper application that a safe installation may be achieved.

There are a few important things to understand about what a UL-listed and certified industrial control panel signifies. For one, the certification mark only covers the industrial control panel itself. The certification does not cover any of the actual equipment that is being controlled by the control panel, nor does it cover the equipment on which the control panel has been mounted.

Montana Controls specializes in industrial control panel design and control panel manufacturing that is compliant with UL 508A.Most UL 508A-required markings are to be located in a way that allows clear visibility after the installation of the field wiring. In addition to the required markings, UL 508A also requires that an industrial control panel is accompanied by a complete electrical schematic wiring diagram that includes all of the components that were originally provided by the manufacturer. In order for the control panel to comply with UL 508A, an industrial control panel design is to be marked with the following information.

  • Manufacturer’s name, trademark, or other descriptive marking
  • Supply voltage, number of phases, frequency, and full-load current for each incoming supply circuit
  • If a control panel has multiple power sources where more than one source must be disconnected in order for the full de-energizing of the equipment to occur, then that control panel must be marked to indicate that there is more than one disconnecting means of de-energizing
  • Short-circuit current rating based on one of the following:
    • Short-circuit current rating of a listed and labeled assembly
    • Short-circuit current rating established using an approved method
  • If a control panel is intended for use as service equipment, it must be marked as being suitable for such
  • Electrical wiring diagram or the ID number of a separate diagram
  • An enclosure type number

UL Panel Shop Capabilities:

  • Design
  • Engineering
  • Fabrication
  • Assembly
  • Programming
  • Installation
  • Testing

Common Questions:

What are the Beneifts of UL Listed Industrial Control Panels?

The UL Listing Mark on an Industrial Control Panel provides evidence of third party certification to North American saftey standards to the purchaser of the panel.

UL Listed Industrial Control Panels are constructed and marked to facilitate installation to the National Electrical Code and Canadian Electrical Code. As such, the UL Listing Mark on an Industrial Control Panel is widely recognized and accepted by municipal inspection authorities.

The Listing Mark may be applied to a wide variety of designs, ranging from custom built to standardized designs. Industrial Control Panels can be constructed and marked for general use applications as well as a number of special use applications.

Can Existing Used Panels be UL Listed?

No, a UL Panel can only get a UL sticker with a serial number when it is newly built before it leaves and goes to the field.

Can Used Parts be Used in a New UL Listed Panel?

No, UL Listed panels need to have new UL Listed parts inside the panel.

Do UL Listed Panels Need Drawings?

Yes, they do need to have drawings and the panels need to match the drawings, in some cases the drawings might need to be updated during the process of building the panel.