If you are specifying an industrial control panel, you have almost certainly seen the UL-508A and UL-698A markings. They sound similar, and both are issued by UL, but they cover different types of equipment. Choosing the wrong one can stall an inspection or force a costly rebuild. This guide breaks down the difference in plain language.
What UL-508A covers
UL-508A is the Standard for Industrial Control Panels. It applies to general-purpose control panels installed in ordinary (non-hazardous) locations — the enclosures that house PLCs, motor starters, variable frequency drives, circuit protection, and terminal blocks that run a machine or process.
A UL-508A listed panel has been built by a certified shop to a documented set of construction, wiring, spacing, and short-circuit-current-rating (SCCR) requirements, and it carries a serialized label an inspector can verify. For most water, wastewater, food & beverage, and manufacturing applications, UL-508A is the standard you want.
What UL-698A covers
UL-698A is the Standard for Industrial Control Panels Relating to Hazardous (Classified) Locations. It applies when the control equipment interfaces with devices located in a hazardous area — think Class I, Division 1 or 2 environments where flammable gases or vapors may be present, common in oil & gas and some chemical processes.
A UL-698A panel adds intrinsic-safety barriers, purge/pressurization provisions, or other protection methods so that the field wiring to the hazardous area cannot ignite the atmosphere. It is a more specialized listing and is only required when the application genuinely involves a classified location.
How to choose
- Non-hazardous location, standard machine or process control → UL-508A.
- Panel connects to instruments or devices inside a Class I/II/III classified area → UL-698A (often alongside UL-508A for the non-hazardous portion).
- When in doubt, confirm the area classification with the facility electrical engineer before the panel is designed — retrofitting a listing after the fact is expensive.
Why the listing matters
A proper UL listing is not just a sticker. It tells the authority having jurisdiction (AHJ) that the panel meets a recognized safety standard, which keeps inspections smooth and protects your facility and personnel. It also documents the panel’s SCCR, a number the NEC requires and that inspectors increasingly check.
How Radiant helps
Radiant Control Systems designs and fabricates UL-508A control panels for water, power, and industrial clients across Georgia and the Southeast, and works with clients to scope the right approach when hazardous locations are involved. Every panel is built to UL-508A and NEC code with a documented SCCR.