ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Do we need grounding?
by gfretwell - 04/06/24 08:32 PM
UL 508A SPACING
by tortuga - 03/30/24 07:39 PM
Increasing demand factors in residential
by tortuga - 03/28/24 05:57 PM
Portable generator question
by Steve Miller - 03/19/24 08:50 PM
240V only in a home and NEC?
by dsk - 03/19/24 06:33 AM
New in the Gallery:
This is a new one
This is a new one
by timmp, September 24
Few pics I found
Few pics I found
by timmp, August 15
Who's Online Now
0 members (), 96 guests, and 10 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
#139208 10/23/03 11:01 AM
Joined: Jan 2002
Posts: 59
C
Member
Does anyone have information on earth leakage circuit breakers used in
South African mines around 1950?
Your help will be appreciated. Creighton

#139209 10/23/03 11:17 AM
Joined: Sep 2002
Posts: 1,498
Likes: 1
C
C-H Offline
Member
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
Joined: Jan 2002
Posts: 59
C
Member
Thanks, C-H. That is just the ticket.
Creighton

#139211 10/24/03 02:45 PM
Joined: Dec 2002
Posts: 206
G
Member
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
Joined: Aug 2001
Posts: 7,520
P
Member
It does indeed, I find these historical summaries of certain devices or practices to be very illuminating.


Link Copied to Clipboard
Powered by UBB.threads™ PHP Forum Software 7.7.5