Do custom electrical control panels for equipment have to be UL listed/ have UL components?
This is a common question, all ready asked a few times. The answer is; 'it depends'.
Many panels are built without U/L listing. For their panels, ultimately, the AHJ has to either approve the use of this panel and its components, or disapprove of it. Building it with U/L components would greatly simplify this process.
Nope, using a bunch of listed or recognized components will not simplify the process for the AHJ. The complete assembly has to either be listed as a whole or field evaluated.
It is unclear what you are asking. In the title (question) you say, "custom electrical panel" however in the first sentence you say, "custom electrical control panel." These are two distinctly different animals. Electrical panels fall under Article 408, while Industrial (electrical) control panels fall under Article 409.
408 - Speaking as an AHJ, if you make a panelboard that isn't listed, I would not approve the installation. There is just too much to consider.
409 - For an industrial control panel, if the industrial control panel is intended as service equipment, it shall be marked to identify it as being suitable for use as service equipment. I don't believe it is possible to get that marking without it being listed. For other types of industrial control panels I might approve the installation, depending upon what is being installed. If it is part of some complex system such as a dust collector system, for example, I would probably require the listing.
Electrical control panels are not required to have a UL label in the industrial world. Each panel is built up for a specific process. There are building officials in the commercial building world that will require either an assembly UL label or engineering certification.
409.110(5) - If required, how does one get a SUSE rating unless the product is listed?
I guess this is about using a manual transfer switch as the service disconnect and not a custom control panel. My bad!!I found SUSE to mean "Suitable for use as service equipment" but where is SUSE found as an officially acronym? I do not believe a Transfer switch is classed as a control panels even though it has one. I do not believe a UL service entrance label is readily available for transfer switches. With enough money of course anything is possible.
Transfer Equipment is always required to be listed for the intended use, and there are many types of transfer equipment that is listed as “Suitable for Use as Service Equipment”
Have no idea why the link I submitted was rejected but I stand corrected in saying transfer switches do not have an SE label. I think it needs to be qualified in that the label must be for single family residential construction when connected to the utility grid. I have never specified a transfer switch with an SE rating on commercial or industrial projects. What are we talking about here??
"there are many types of transfer equipment that is listed as “Suitable for Use as Service Equipment”Response: Yes I had one of my generator reps bring me up to date on SE rated transfer switches and where they are used and why. Having come out of the healthcare and industrial design world SE rated transfer switches were never used as service disconnect switches. I do not think OCCA would have allowed them on hospitals. I will study up on SE rated transfer switches now that I know they exist.
That is great. Only we aren't talking about transfer switches.
Service rated ATS’s are not typically installed for NFPA 110 Level 1 or Level 2 applications. The reasoning behind this is that a fault in the service equipment could also take out the emergency or legally required standby system. Service rated ATS’s are very common on Optional Standby Systems.
Thank you Brian for that explanation. Even though I got off track I did learn something from this.
A field evaluation by an approved field evaluation body would be required were a listing is not possible.
We were talking about:
"custom electrical panel" or, "custom electrical control panel." These are two distinctly different animals. Electrical panels fall under Article 408, while Industrial (electrical) control panels fall under Article 409.
For some reason Ron changed the subject to Transfer Switches, which was never the subject.
Got it from some where but regardless I was wrong about transfer switches and now have a better understanding about them. Can't speak for control panels used as service entrance equipment never done that and probably never will. When a control panel is designed in an industrial environment it is always custom built for the manufacturing process and is never an off the shelf control system. I would commonly use Allen Bradley components based on USA and IC standards in the same enclosure but never used a control panel for service entrance duty. The code allows it but I have never seem it done.
Retrieving data ...