If you’re not sure whether your entire panel assembly is certified, or just a part of it, ask us. As you can see in the following listing report for the EBC 31, these controllers are in sync with UL’s latest listing standards for draft/motor controllers: The EBC 31 Modulating Pressure Controller is a good example of a fully certified mechanical draft controller that was designed to comply with the strict safety guidelines of UL508A as well as UL 378, baked in right from the start. Therefore, ALL mechanical draft equipment and controllers, including Motor Control Centers, Switchboards, Panel Boards and Draft Controllers, require separate and unique UL certifications. For example, nowhere is it implied that a UL508A panel can be considered or certified to UL 378 standard for draft equipment! That’s the only way to make sure the system as a whole is will operate in a safe and effective manner.Ĭertification to UL508A does not mean you can build to or meet any other standard. You really need to verify that each panel component is what UL calls “Listed” or “Recognized” for the specific application. It’s well worth diving deeper to see what you’re really buying. However, as the one ultimately responsible for safety, you need to understand that the UL508A label is just that… a label. So naturally, most people opt for the lower-cost option.
Manuel Haro, CEO and director of sales for Accurate Controls ABB describes this as a “don’t ask, don’t tell” mentality.īuyers can expect to pay approximately 10 percent more for a UL508A certified panel over a panel of similar construction. That’s O.K., as long as the buyer knows to ask the shop whether or not the panel is certified. In fact, most shops sell about 80 percent of their inventory as non-certified. Non-certified panels do have a place in the market, clearly. This isn’t always communicated to the panel buyer, and discount panels have worked this to their advantage quite nicely. ‘Certified shop’ does NOT mean ‘certified panel.’ It’s important to understand that UL-certified panel shops are NOT required to make only UL-certified panels. Dimensions and separation between penetrations to the control panel as well as proper sizing.Proper separation of devices and terminals.Best wiring practices to ensure safety and functionality.Adherence to the latest national electric codes (finger-safe terminals, contact points).Use of UL-listed or UL-recognized components.Appropriate interrupting capacity ratings.Wire-bending radius inside the control panel.In a UL508A panel, parts must be listed or recognized for the panel’s intended use, and the panel must comply with certain requirements, including:
#Ul 508a manual manuals
Installation manuals and testing/verification of any software and functionality are MANDATORY, and all parts are certified. In contrast, a UL Listed Control means the manufacturer builds an additional controller that meets safety design guidelines AND functionality as described in the UL standards to which it is listed. The panel shop applies a UL508A sticker to the product and frequently, that’s enough to pass off the system as ‘certified.’ It’s a common and dangerous mistake to assume that all components on the inside are also UL listed.
No required testing of PLC software for safety only for functionality.UL Listed ControlĪ UL508A Panel Listing allows a panel shop to build controls that comply with UL508A safety design guidelines. Kinda sneaky, right? How does this happen? And what can you do to ensure safe electrical operation of your control panels? UL508A Panel vs. ‘Certified panel shop’ does NOT mean ‘certified panel!’.A UL sticker on the outside may mean that only the enclosure is listed, not the entire assembly.There are two dark secrets which most panel buyers don’t know about, but need to: But what does it really mean when you buy a control panel labelled “UL listed?” It’s no surprise that certified draft control products save significant time and money while reducing the risk of shock, fire, equipment damage and even explosion.
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