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GFCI Theory
Mike Sokol:
Here's an article on GFCI theory I just posted on PSW.
http://www.prosoundweb.com/article//no_shock_zone_understanding_and_preventing_electrical_damage_and_worse/
As you can see, GFCIs really don't need a safety ground at all to protect you from electrocution. I'm prepping for a gig tonight, but will add some more info about GFCIs after I get back early next week. In the meantime, please post anything you think is important about GFCI usage in the pro-sound world.
Jonathan Johnson:
Note that GFCI is also abbreviated simply GFI sometimes. Whether the abbreviation is GFCI or GFI, it refers to the exact same thing.
Another common protective device, now required in certain residential circuits in the US (since the 2005 NEC), is an Arc-Fault Circuit Interrupter (AFCI or AFI). This technology detects the waveform distortion caused by electrical arcing and disconnects the circuit.
More information on AFCI here: http://www.afcisafety.org/
"There is a major difference between the functioning of an AFCI as compared to a GFCI (Ground Fault Circuit Interrupter). The function of the GFCI is to protect people from the deadly effects of electric shock that could occur if parts of an electrical appliance or tool become energized due to a ground fault. The function of the AFCI is to protect the branch circuit wiring from dangerous arcing faults that could initiate an electrical fire."
Jonathan Johnson:
The National Electrical Manufacturer's Association (NEMA) has a presentation on GFCI theory, construction, and application:
http://www.nema.org/Products/Pages/GFCI.aspx
This appears to be a slideshow presentation. It would be more meaningful if we had the audio portion, but there's still something to be learned here.
John Roberts {JR}:
And in Europe they are called RCD (residual current devices)....
JR
Jonathan Johnson:
--- Quote from: John Roberts {JR} on September 21, 2013, 01:43:45 PM ---And in Europe they are called RCD (residual current devices)....
JR
--- End quote ---
NEMA claims that GFCI is superior to RCD ;)
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