It doesn't say it will not work on a GFCI protected circuit. It says that nuisance tripping may occur. It doesn't say the appliance will cause the tripping. GFCI's do trip from other events in the home including utility power issues.
I was responding to the comment that implied the NEC was somehow requiring things that were impossible to solve, that they had overstepped, 'leap fogging' the poor manufacturers, that the GFCI requirement should be removed.
Because GFCI's do nuisance trip, especially on new equipment with electronic motor controls. I want GFCI protection for places like outdoor receptacles where items are plugged and unplugged, different tools are powered up, and extension cords are used. I don't want them on my fridge or anything else that stays in place. I would happily accept 30mA ground fault protection. It would trip before any one year old kid touched it and it wouldn't trip unnecessarily during a weekend trip. What's going to happen is people are going to start ripping out GFCIs and putting in non-ground fault plugs or breakers and the end result is less safety for the grand-kids overall.
Same in a commercial kitchen, so what about that commercial kitchen GFCI requirement? get rid of that too?
Dwelling kitchen appliance are seldom moved. Commercial kitchen equipment is frequently moved, sometimes daily for cleaning. Much better chance of the cord/EGC getting damaged.
Also greater opportunities for fingers to accidentally touch plug blades, and with wet fingers.
I've been advocating some arrangement where the GFCI permits greater leakage if the EGC is detected to be intact.
There's no need for any of that. Simply do what the rest of the world does and adopt 30mA protection. Equipment works, manufacturers still get to sell expensive breakers, and electrical installs are safer.
I would say yes. My understanding was the vast majority of these commercial kitchen GFCI requirements were not based on any historical or statistical data showing significant issues.
That seems reasonable. Hopefully they'll put it in writing somewhere soon. Perhaps in the next LNI Electrical Currents newsletter.
What prevents you from installing GFCI protection on a circuit that doesn't require it?
Maybe review OSHA guidance, particular attention to the 60 cycle. https://www.voltstick.com/how-to-av/videos-and-blogs/osha
That difference is based on what the device is trying to do. The 30mA trip is to prevent ventricular fibrillation. The 5mA is not to exceed the let-go threshold current. It would be interesting to see the effects of a sustained 20 mA current on the human body. A current that is high enough that many people could not let go of the energized part, but a current that a 30 mA device will let flow forever.
Unless the leakage current is high enough to cause a huge amount of voltage drop on the EGC, the EGC eliminates the shock hazard from leakage current. Without voltage drop, the EGC holds the voltage on the appliance parts to the same voltage that exists to ground at the location of the main bonding jumper.
