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Re: History of the GFCI Video [Re: Joe Tedesco] #212343 12/31/13 03:29 PM
Joined: Oct 2000
Posts: 2,749
Joe Tedesco Offline OP
Member
I will have to check my files from when we posted our messages on Prodigy. I have a lot of old files from then and it may take me some time. Is Wally still active in the business?


Joe Tedesco, NEC Consultant
Work Gear for Electricians and the Trades
Re: History of the GFCI Video [Re: Joe Tedesco] #212345 12/31/13 05:29 PM
Joined: Jul 2004
Posts: 9,390
G
gfretwell Online Content
Member
Another blast from the past

[Linked Image]

[Linked Image]


Greg Fretwell
Re: History of the GFCI Video [Re: Joe Tedesco] #212348 12/31/13 06:10 PM
Joined: Jul 2004
Posts: 9,390
G
gfretwell Online Content
Member
Left to right (picture)
Ed Schick, Harold E, Joe T, Rich Lintl, Wally Harris
Wiz ........Caper .....Nail .....Poh Bah .....Sheriff


Greg Fretwell
Re: History of the GFCI Video [Re: Joe Tedesco] #212368 01/02/14 12:23 AM
Joined: Feb 2002
Posts: 2,233
H
harold endean Offline
Member
Greg,

That's right! Rich was Poh Bah! Oh man, I forgot that, it seems like a long time ago. I haven't heard from Sheriff in years. I hope all is well with him. As for the Wiz, he and I were good friends on the board, but we tried to keep in touch. He lived in NY state, just north of NJ as I remembered. Do you remember a member named "The Whale"? He grew up in the town next to me and he was part of our SS and his wife committed suicide. I got his e-mail that day, it was an e-mail, I will never forget.

P.S. I still have my T-shirt. I don't think it fits anymore smile but I will never give it away!

Re: History of the GFCI Video [Re: Joe Tedesco] #212493 01/12/14 11:53 AM
Joined: Aug 2008
Posts: 51
A
andey Offline
Member
Can anyone read the year they display at the end of the clip?
It's interesting to see they name a californian professor as the inventor of the gfci.
Here in Germany you will be told it's a german/austrian invention, first patented in 1903 by Schuckert company which was a part of Siemens. Then there seems to be a US patent by Nicholson from 1908, based on the 1903 work.
The first GFCI for wide use by power customers was presented in 1951 by Schupa company.
My parents have a 1968 house that had a 3-phase main GFCI by Schupa installed when built.

Re: History of the GFCI Video [Re: Joe Tedesco] #212504 01/13/14 02:47 PM
Joined: Dec 2001
Posts: 2,455
T
Texas_Ranger Offline
Member
Well the Schupa product (as well as any previous designs) was probably what is referred to as an electro-mechanical RCD. The modern US GFI is partially electronic in order to achieve the higher sensitivity of 6 mA.

To add more confusion, the first usable 30 mA RCD was designed by an Austrian, Gottfried Biegelmeier in the late 50s.

The oldest RCD I've seen myself is probably from 1955 and has a trip current of 1 A. It was used to protect a 3-phase socket in my great-grandparents' home in Germany. All other circuits in the house are TN-C (i.e. with a jumper between neutral and earth in each socket) but the 3ph socket was not, probably because the original electrician thought it would likely supply outdoor equipment (it's right next to the front door).

Re: History of the GFCI Video [Re: Joe Tedesco] #212506 01/13/14 06:32 PM
Joined: Aug 2008
Posts: 51
A
andey Offline
Member
Wow, 6mA?
Isnt that pretty close for some line filters, power supplies...?

How long have they had 6mA? The animation at 8:00 shows a regular circuit without electronics.

Re: History of the GFCI Video [Re: Joe Tedesco] #212507 01/13/14 10:36 PM
Joined: Jul 2004
Posts: 9,390
G
gfretwell Online Content
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I really have not had much nuisance tripping from PCs connected to GFCIs and as long as your wiring practices are tight you can have them all over, outside in the rain and get away with it


Greg Fretwell
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