- Location
- Chapel Hill, NC
- Occupation
- Retired Electrical Contractor
I was listening to a video by mike holt and I starting thinking. That is usually a problem for me...
Anyway I found that the National Institute for Occupational Safety and Health did studies that states the human body can have a resistance of up to 100,000 ohms but about 95% of the people tested had a resistance of 3,200 ohms.
Okay lets look at a scenario where someone is wet and there resistance is 50,000 ohms. Simple math I = V/R = 120V (assume this)/50,000 = 2.4 ma.
We know that a gfci will trip between 4-6 ma so if we come in contact with a grounded object and 120V on the load side of a GFCI will that gfci trip? I say know but I am curious if I am missing something. I am assuming anything over 4- 6 ma threshold is a sure trip also
Anyway I found that the National Institute for Occupational Safety and Health did studies that states the human body can have a resistance of up to 100,000 ohms but about 95% of the people tested had a resistance of 3,200 ohms.
Okay lets look at a scenario where someone is wet and there resistance is 50,000 ohms. Simple math I = V/R = 120V (assume this)/50,000 = 2.4 ma.
We know that a gfci will trip between 4-6 ma so if we come in contact with a grounded object and 120V on the load side of a GFCI will that gfci trip? I say know but I am curious if I am missing something. I am assuming anything over 4- 6 ma threshold is a sure trip also