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  • Case Study

Industrial Control Equipment Transition to IEC Standards

Helping you transition to new standards for industrial control equipment that are being harmonized to increase global market access. UL 60947 replaces current requirements in UL 508 for several types of industrial control equipment.

Technician working on an industrial control panel


Whether you are developing products to be sold locally or internationally, knowing the relevant product safety standards is important. Safety standards for industrial control equipment (ICE) are being harmonized to increase global market access.

The result of this harmonization process is detailed in the table below. The table identifies the affected product categories and the corresponding harmonized Standard to which they will be transitioned, along with other information needed.

Transition table

Affected Category (CCN) from UL 508 or UL 508C


Start/End Dates


Transition FAQs

Magnetic Motor Controllers – NLDX
Manual Motor Controllers – NLRV
Combination Motor Controllers – NKJH
Auxiliary Devices (Overload Relays ONLY) – NKCR
Industrial Control Switches, Intended for use in Power Circuits (direct connection to Mains) – NRNT

UL 60947-4-1

Jan 26, 2012/Jan 26, 2017

Latest Communication (July 2015)


Programmable Logic Controllers – NRAQ

UL 61010-2-201 (with no National Differences)

Sept 10, 2013/April 1, 2016

Initial Communication
(Mar 19, 2012)
2nd Communication
(Sept 9, 2013)
3rd Communication
(Nov 11, 2014)


Proximity Switches – NRKH

UL 60947-5-2 2

Mar 28, 2014/TBD



Power Conversion Equipment – NMMS

UL 61800-5-1

Feb  1, 2016/Feb 1, 2020

Initial Communication
(Aug 23, 2012)
2nd Communication
(Apr 10, 2013)
3rd Communication (May 19, 2015)


Auxiliary Devices (Excluding Overload Relays) – NKCR

UL 60947-5-1 2

Mar 28, 2014/TBD



Motor Controllers, Mechanically Operated and Solid-state, Solid-State Controls for Motor Loads – NMFT

UL 60947-4-2

Mar 21, 2014/Mar 21, 2021

Initial Communication (July 16, 2015)


Industrial Control Switches, Solid-state Controls for Non-Motor Loads – NRNT

UL 60947-4-3




Industrial Control Switches, All-or-Nothing Relays – NRNT
Magnetic Motor Controllers – NLDX
Auxiliary Devices (Excluding Overload Relays) – NKCR

UL 61810-1 2




1 Start Date – Date when the new Standard(s) may be used for Certification; End Date = Date when UL 508/508C is no longer an option for new and alternate construction product investigations.
2 These Standards have been published and are available for use toward Certification. Details regarding the transition schedule, bulletins and associated FAQs will be provided in the future.

Supplemental Information

Action required

Unless indicated in one of the above-mentioned transitions, if you currently have a product certified to UL 508 or UL 508C, under one of the affected categories, please contact UL Solutions by the requested date to convert your existing file to the appropriate harmonized Standard(s). Contact your local sales representative to request a quotation, click here, or use the Contact UL button on this page.

Please note that if you have any product or sales literature that references UL 508, or UL 508C, you should consider revising such literature to reference the new corresponding harmonized Standard.

Please be certain to review this website regularly for updates to the current and new Standard transitions.

More information on industrial equipment

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