What Do the Changes to Self-Test GFCIs Mean to You?

Unless you are an electrical contractor, you might not have heard about UL 943 and the necessary transition to self-test Ground-fault Circuit Interrupters (GFCIs). We’re here to break it down and make it simple to understand!

What is it?

The Underwriters Laboratory (UL) Standard 943 for GFCIs requires manufacturers to include a new function for all ground fault receptacles (GFRs) being built after June 29, 2015.

What does that mean?

The new functionality required by the UL means that each GFR must automatically monitor the GFCI circuit/functionality periodically every three hours or less. It must also automatically test within five seconds of power to the device.

New 2015 GFCI Requirements

Standard 943: June 29, 2015, changes:

  • “Automatically” monitor GFCI circuit/functionality “periodically”
    • Automatically test within five (5) seconds of power to line and load terminals
    • Periodically means every three (3) hours or less
  • If the unit can no longer provide GFCI protection, it must comply with the following
    • “Deny Power” (trip with the inability to reset)
    • Trip with the ability to reset, subject to the next auto-monitoring test cycle
    • Visual and/or audible indication as permitted by UL 943
  • 30.8 visual and/or audible indication
    • GFCI must visually or audibly indicate that it does not go to power denial

What is changing for the customer?

The external changes are very minimal. There are no changes in wiring or method of installation, nor are there changes in user interface or physical size. The only physical external changes are an added power indicator and an added trip indicator.

The internal changes are moderately major. They include:

  • New microcontroller/programmed for auto monitor
  • Major component additions to printed circuit board for filtering, diagnostics and monitoring
  • Single printed circuit board changed to a double sided PCB
  • Added power LED board
  • Added electronics for trip indicator (solid red when tripped)
  • 100% new tooling across all lines for internal design changes

You can still buy and install the current generation of GFCIs until the inventories are depleted, but manufacturers will no longer produce the previous generation of GFCIs after June 29.

Hubbell’s Got Your Back

With Hubbell’s Self Test GFCI Patented Technology, the GFCI receptacles continually test and monitor for “people protection capabilities” automatically. This patented safety feature includes disconnecting power to the receptacle if critical components are damaged. Give your French Gerleman representative a call to learn more about the full line of Hubbell GFCIs or to place your order!


Source: Hubbell Wiring Device- Kellems

GFCI Hubbell Self-Test GFCIs