ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Top Posters(30 Days)
Trumpy 5
Recent Posts
What do you do?
by HotLine1. 09/20/17 08:44 PM
Supporting conduit bodies
by ghost307. 09/18/17 12:12 PM
Thermal Imaging Camera upgrade
by Potseal. 09/18/17 11:57 AM
Linear Power Supply Quits Under Load
by JoeTestingEngr. 09/15/17 11:37 PM
Recreational Trailer Power Supply
by David1. 09/14/17 01:55 PM
New in the Gallery:
Gallery Test
Popular Topics(Views)
240,842 Are you busy
176,598 Re: Forum
168,518 Need opinion
Who's Online Now
0 registered members (), 31 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate This Thread
#139208 - 10/23/03 11:01 AM GFCI  
Creighton  Offline
Member
Joined: Jan 2002
Posts: 59
Hayward, CA
Does anyone have information on earth leakage circuit breakers used in
South African mines around 1950?
Your help will be appreciated. Creighton


Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement

#139209 - 10/23/03 11:17 AM Re: GFCI  
C-H  Offline
Member
Joined: Sep 2002
Posts: 1,497
Stockholm, Sweden
Here is a paper on the development of earth leakage circuit breakers from a South African perspective.
http://www.cbi.co.za/papers/24/CBI2.pdf


#139210 - 10/23/03 12:17 PM Re: GFCI  
Creighton  Offline
Member
Joined: Jan 2002
Posts: 59
Hayward, CA
Thanks, C-H. That is just the ticket.
Creighton


#139211 - 10/24/03 02:45 PM Re: GFCI  
geoff in UK  Offline
Member
Joined: Dec 2002
Posts: 184
UK
That's an excellent bit of technical history. It throws a new light on things we now take for granted.


#139212 - 10/24/03 03:25 PM Re: GFCI  
pauluk  Offline
Member
Joined: Aug 2001
Posts: 7,520
Norfolk, England
It does indeed, I find these historical summaries of certain devices or practices to be very illuminating.



Member Spotlight
akmaster
akmaster
alaska
Posts: 70
Joined: June 2012
Show All Member Profiles 
Featured:

2017 Master Electrician Exam Preparation Combos
2017 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Shout Box
Powered by UBB.threads™ PHP Forum Software 7.6.0
Page Time: 0.014s Queries: 14 (0.003s) Memory: 0.7658 MB (Peak: 0.9047 MB) Zlib enabled. Server Time: 2017-09-21 10:35:48 UTC