FAQs
We often get questions about best practices, differences between certifications and when to choose between different designs and components. See the most common questions and insights below.
UL and NFPA, what do they cover and when do I need them?
Here is a reference document that many of our customers have found useful. (PDF the secrets of UL and NFPA (PDF, opens in a new tab))
The enclosure I am looking to buy says UL, is that all I need to have a UL Certified Control Panel?
The UL Certified label on the enclosure is just for the enclosure. For a UL Certified Control Panel, you need a UL Certified Panel Shop to verify compliance, build, and certify. See this link for a useful article related to UL Certifications. (Dark secret about certified control panels (PDF, opens in a new tab))
PNP & NPN, which is which and when should I use one vs the other?
Here is an excellent article that breaks down and answers this question well. (How to decide between PNP and NPN (PDF, opens in a new tab))