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Post by Jack, lapidaryrough on Jan 26, 2011 11:32:03 GMT -5
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Post by deb193redux on Jan 26, 2011 13:02:22 GMT -5
Jack, You keep calling the GFI the "house breaker", and that is the source of your confusion. Nobody is disputing the big difference between GFI devices and normal circuit breakers. We are just pointing out the GFI and GFCI are two interchangable names for Residual-current devices that have other names as well. ( en.wikipedia.org/wiki/Residual-current_device) There are normal circuit breakers that trip when rated amperage is exceeded (i.e., to protect the electrical system) ... and then there are GFC/GFCI which trip on very small irregularities in the residual current. BTW, I think the heart attack mentioned in your link was at 100 mA, not 10 mA. Reading numbers wrong, not trying to understand what others are saying, dropping decimal places, refusing to accept feedback .... Jack, it is a bit sad.
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Post by parfive on Jan 26, 2011 15:32:14 GMT -5
Class A GFI/GFCI protect people, 4-6 mA trip Class B GFI/GFCI protect equipment, typically 20 or 30 mA trip
Apparently, some try to make that distinction by using GFCI for Class A and GFI for Class B. That is wrong, the distinction is Class A or Class B, not GFCI or GFI.
Besides which, Class B GFI/GFCIs are properly called GFPE or GFPD, Ground-Fault Protection of Equipment/Device.
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Post by deb193redux on Jan 26, 2011 16:37:39 GMT -5
Yes, I read something about sensitivity on Wikipedia, and I understood that the GFCI did come in differenct grades, but I did not understand the I-delta-n notation used: Sensitivity: RCD sensitivity is expressed as the rated residual operating current, noted I-delta-n. Preferred values have been defined by the IEC, thus making it possible to divide RCDs into three groups according to their I-delta-n value.
High sensitivity (HS): 6 – 10 – 30 mA (for direct-contact / life injury protection) Medium sensitivity (MS): 100 – 300 – 500 – 1000 mA (for fire protection) Low sensitivity (LS): 3 – 10 – 30 A (typically for protection of machines)
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Post by parfive on Jan 26, 2011 17:48:10 GMT -5
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drjo
fully equipped rock polisher
Honduran Opal & DIY Nut
Member since May 2008
Posts: 1,581
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Post by drjo on Jan 27, 2011 8:01:09 GMT -5
I thought this was common knowledge now, and what brought this on?
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Post by jakesrocks on Jan 27, 2011 9:56:05 GMT -5
Maybe they plan on tumbling GFI's. :cheesy:
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Post by rocklicker on Jan 28, 2011 20:08:20 GMT -5
I keep most of my rock equipment plugged into GFI/GFCI's. It seemed like a good idea. Steve
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