Instruction: Given a question and its related document, determine if the question is answerable by analyzing the information in the document. Output yes if the document addresses the question, or no otherwise.

Input:
Question: can it be used in a circuit already protected with a gfci in the house wiring ???
Document: I got this because my wife's sweeper would not work in our new house. Seems that the new circuit breakers in new house are too sensitive to motors starting up. I bought this thing as it was supposed to take the load and not trip the breaker. It did not work at all. Since it was so cheap I did not try yo return it.
This has been in use on a 50 ft. drop cord sense Oct. 2012 that supplies electric to my Chicken House that has aWarmer to keep water thawed for Chickens, it has never failed me and it is SAFE.
I have only had this circuit interrupter for a few weeks, but it consistently works quickly every time I test it. It also seems very thick and sturdy.
I used this to plug in a power strip for use for my three aquariums. Should any water leak or drip into the power strip I won't have to worry about causing an electrical hazard, glad I bought it.
The TM GFCI Adapter was the best solution for the application it was used in. I had a ground loop problem with a Pro amp, I had to lift the ground leg of the amp and was concerned with safety code doing this, I plugged the amp into my surge suppressor with the ground prong lifted and the SS into the TM GFCI, problem solved, doing this grounded the amp and now I have piece of mind and no hum or noise and it's safe.
The hard wired GFI on my pool pump failed, and a new pool pump in $148.96. I won't have a pool pump that's not ground fault protected, and this is the practical way to replace the GFI without buying a whole new pump. Big savings (and the kids are still safe).
my waterpresure merchine was not working for many months. i could not wash my car ! i planed to buy a new one and i  found out it on Amazon , after replacing it and it work so well ! !
Works well, but the adapter is always warm to the touch even when it is switched off.
Works great. Others sell for much more. It has an LED indicator to let you know when its working, also comes with a test feature. I would recommend for protection.
We use heated water buckets in our barn and it is a good safety feature as some  of our heaters only have two prong plugs and I like the added fact that it converts them to a grounded plug.
Answer: no