I have a customer (restaurant) that has an outdoor bar. It is fully-covered, but everything electrical is wired as if it is a wet location. The dishwasher is cord connected to a standard 5-20 GFI receptacle that trips fairly consistently. They replaced the entire dishwasher and the new one does the same thing.
I'd like to hard-wire the thing with a take-off box and a short piece of liquid-tight flex, but the appliance people are insistent that it remain connected via plug and receptacle.
If I have to do this, I'd like to remove the GFI receptacle from the equation by using an L5-20 "Twist Lock" receptacle and plug with an in-use cover.
Does anyone have any heartburn about doing it this way?
The first thing I would do is figure out why the GFCI is tripping. Do they hose this place down? Is rain blowing in? Are there critters nesting inside the dish washer?
Otherwise you are asking, how close is it to the sink (<6'), is this a "kitchen" and is it really "outdoors"? 210.8(B) does not say NEMA 5-15, it says 15 & 20a 125v receptacle. Twist lock does not change that.
When they replaced the dishwasher, did they use the same (old) cord. The paper in some SJ type cords will wick up moisture and cause GFCI to trip. Replace cord with an SO cable or one that has no paper filler.
There are five GFI receptacles within reach of this dishwasher an it trips every one of them consistently. I don't see the receptacles themselves as being the culprit. Yes, it appears that they reused the original cord on the new washer, so the cord could be causing this issue. It is SO cord though. They did have their maintenance man in that morning with the power washer to clean the entire bar area, so he may have gotten a bit carried away with it.
At this point, I have told the customer to have their appliance people come out to investigate further.
John, there are five WP GFI receptacles all clustered together for them to use for outdoor cash registers, printers, etc. I'm in agreement with everyone though; the GFI is doing what it is supposed to do, so they will need to call in the appliance repair people. This is why they pay for their maintenance contract.