Control Panel Standards for the US Market

Count on Siemens as your trusted partner for control panel standards

Several organizations dedicated to promoting technical safety exist in the United States and Canada. The National Electric Code (NEC) NFPA70 (National Fire Protection Association) covers the safe installation of electrical wiring and equipment in the United States. Underwriters Laboratories’ UL508A for Industrial Control Panels is also relevant in the US. Learn more about the relevant standards for the United States below or read our white paper on the recent changes. Questions on industrial control panel standards for the United States? Get in contact with one of our experts for personalized consulting on your industrial control panel application.

North American Electrical Standards by Region

Industrial Control Panel Standards for the United States

The NFPA70 for the safe installation of electrical wiring and equipment is the only code for industrial control panels that is recognized under US law. However, due to its broad umbrella of topics, NFPA70 does not explicitly state the requirements for industrial control panels. It does mention industrial control panels and refers to UL508A as an accepted standard for reference. It is therefore important that control panel builders abide by UL508A as dictated by NFPA70 when building industrial control panels in the US. As standards must be accepted by each individual state before going into effect, it is also important to be aware of the locally accepted standard in each state. The NFPA website keeps an up-to-date adoption map indicating which NEC edition is currently accepted in each state.

NFPA79, the NEC Electrical Standard for Industrial Machinery, applies to the entire machine assembly. NFPA79 does not affect the industrial control panel itself, as it covers only up to the point of connection to the panel.

Copies of NFPA70 and UL508A can be purchased on the NFPA and UL websites respectively. Siemens has published a guideline on Industrial Control Panels for North America to help interrupt these standards. You can also contact us for individual standards consulting for your control panel application. Our guide, Control Panels for North America, covers the most important aspects of these standards.

For information on key aspects of U.S. standards, read our white papers on control circuits, short circuit current ratings (SCCR), and Type 1 and Type 2 coordination according to UL.

Illustration of UL 508A panel builder standareds and NFPA 79 Machine safety standards

Effectively apply US standards with Siemens as your trusted partner

At Siemens, we are here to help you with the control panel acceptance process by providing certificates that you can easily download using the CAx Download Manager. With the CAx Download Manager, you can quickly select and download different data types for a single component, or an entire bill of materials, in just a few steps. Data types such as product images, 2D dimensional images, 3D models, wiring diagrams, EPLAN macros, manuals, curves, operating instructions, certificates of compliance, and product master data are all available at your finger tips with the CAx Download Manager. Additionally, SCCR data is readily available for our tested combinations.


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