Underwriters Laboratories (UL) has announced a revision to standard UL 943 that became effective on June 29, 2015. Because testing a GFCI is a good way to verify that it is providing protection, the revision requires that all UL certified Class A residential and commercial grade wallbox mounted GFCIs have:

a) An auto-monitoring function that will allow for periodic automatic testing (self-test) of the GFCI device and its ability to respond to a ground fault. If a problem is detected one or more of the following will happen:

- Power will be denied (trip with the inability to reset)

- Trip with the ability to reset, subject to the next auto-monitoring test cycle or repeatedly trip

- Visual and/or audible indication

b) Provisions to ensure that receptacle type GFCIs that contain separate line and load terminals, and that is powered through its load terminals, shall not reset and supply power to its receptacle face or line terminals if miswired. This applies both during its initial installation and after reinstallation following a correctly wired installation. If the device is provided with special instructions for removal and reinstallation, the instructions shall be followed during testing.

Leviton Responds with New Self-Test Models

In response to the revised standard, GFCI manufacturers must stop producing their current GFCIs and only manufacture the new self-test models as of the end of June. What this means is that you will notice a gradual transition in the market to self-test models by all manufacturers of GFCIs after that date. It is important to note that you can continue to sell and install any GFCI products manufactured prior to the effective date of the revised standard with no restrictions on phase out.

Click here to read the Self-Test GFCI Flyer from Leviton outlining which products are affected along with information on the new self-test products.