ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
ShoutChat
Recent Posts
Violation?
by renosteinke - 01/27/23 09:52 PM
Does NEC 551.71 (F) apply to dwellings?
by BigB - 01/20/23 10:46 AM
Power submeter connections
by HotLine1 - 01/19/23 09:09 AM
AFDD's coming to the UK
by Texas_Ranger - 01/17/23 07:22 PM
New in the Gallery:
Burger King crown sillyness
Burger King crown sillyness
by wa2ise, December 11
240/208 to a house
240/208 to a house
by wa2ise, October 9
Who's Online Now
0 members (), 123 guests, and 14 robots.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Joined: Jul 2002
Posts: 8,432
Likes: 3
Trumpy Offline OP
Member
Here is a website that I frequently like to have a read of:
http://www.eea.co.nz/accident_reports.html#MOC
There are some interesting stories in there. [Linked Image]

Arc Flash PPE Clothing, LOTO & Insulated Tools
Joined: Jul 2002
Posts: 8,432
Likes: 3
Trumpy Offline OP
Member
Just a small note, there are the odd gruesome references to injuries in this site.
Only in text though, discretion is advised.

[This message has been edited by Trumpy (edited 02-14-2004).]

Joined: Aug 2001
Posts: 7,520
P
Member
Some interesting reports there.

Quote
The contracts manager contacted the network owner to find out if electrical services were in the area where they were digging, and a verbal reply from his office was that there were no cables. The following day work began on digging holes and on the third hole an air hammer struck an 11,000 volt cable.

Once again the contractor failed to obtain clear assurance that the area was safe to work.
A written confirmation would provide suitable evidence that inquiries were made, but I would place the blame with the network employee who apparently told the colntractor that the area was clear without bothering to check properly.

Quote
A 15 year old youth received serious burns when he made contact with live parts on a berm mounted 11kV oil switch unit. It would appear that the busbar extension end cover had been removed previously by unauthorised persons. The youth was removing the heat shrink cover from one of the busbars when a flashover occurred. In order to ensure better protection from such vandalism of electrical equipment in the public environment, the use of anti tamper type fixing screws on covers needs to be considered
It's sad to think that vandal-proof fixings are now necessary in such cases. What part of "Danger - High voltage" did he not understand? [Linked Image]

Joined: Jul 2002
Posts: 8,432
Likes: 3
Trumpy Offline OP
Member
The sad part about all of this Paul,
is I was driving past the Xformer down the road from my place (the one that Faulted a few months back) to find a Fencing Contractor driving a pick into the concrete to break it up.
I told him to be careful as there were 33kV cables leading up into the Xformer.
He asked me where they were, I checked my cable location diagrams and sprayed the area with neon paint.
I came back later, no Contractor, but a failed 33kv feeder and a pick right through my paint mark.
In hind-sight, after digging up the cable, the pick was welded to the cable.
This is the junction of 6 33kV cables.
There was a piece of hardened rock next to the pick though!.

Joined: Jul 2002
Posts: 8,432
Likes: 3
Trumpy Offline OP
Member
Just want to relate this to you people.
Upon a Faults call tonight, as part of sectionalising a block of 4 roads, I had an ABS(Air-Break Switch) explode and rain down on me.
Had I not been wearing my Fire Service bunker coat and Helmet+ visor at the time, I'd be in hospital now.
These ABS's are made for dropping loads and can also be closed on load too.
This must be one of the faulty batch that were made in the late 1980's, along with the Oil-filled Earth switches, that fire hot oil at you, if you shut them too quickly!.

Joined: Apr 2002
Posts: 2,527
B
Moderator
Trumpy’s advice is well heeded. A healthy respect for >600-volt gear is always warranted. [As is for <600V gear, too.] There is a phenomenal amount of heat and acoustic-shock energy in electric arcs.

You may not be directly involved with operating >600V distribution equipment, but it still is good to have some understanding of its capabilities in a malfunction. [One source of deadly accidents has been tradesman not identifying higher-voltage equipment, as NOT being 600V-class gear…like attempting to apply a (<1 kV) Simpson or Triplett multimeter to live 15kV-class circuits.]

Joined: Jul 2002
Posts: 8,432
Likes: 3
Trumpy Offline OP
Member
Bjarney,
Interesting that you should mention Test Equipment with HV.
Just how are circuits of different voltage identified in the US?.
As in different wire colours?
Or is it a case of "you don't know until you test"?.
I am thinking that you can't put Warning Signs everywhere. [Linked Image]

Joined: Aug 2001
Posts: 7,520
P
Member
Mike,
I'm not sure about HV, but on low-voltage where both 120/208 and 277/480V systems are present in a building, different color coding is used to identify them, typically:

Black/red/blue + white neutral for 120/208
Brown/orange/yellow + gray neutral for 277/480

Joined: Apr 2002
Posts: 2,527
B
Moderator
We must learn to read {large AND small} equipment labels, and treat equipment as live and at a higher voltage until unambiguously determined otherwise. The basic concepts of “OSHA” 29CFR1910.331-335 must be applied.

We’ve all heard it many times—don’t forget that you are responsible for your own safety, but also we should never compromise the safety of our fellow workmates.


Link Copied to Clipboard
Featured:

Tools for Electricians
Tools for Electricians
 

* * * * * * *
2023 National Electrical Code (NEC)
2023 NEC Now Available!
 
* * * * * * *

2020 Master Electrician Exam Preparation Combos
2020 NEC Electrician
Exam Prep Combos:
Master / Journeyman

 

Member Spotlight
Joe Tedesco
Joe Tedesco
Boston, Massachusetts USA
Posts: 2,749
Joined: October 2000
Top Posters(30 Days)
BigB 9
triple 3
Popular Topics(Views)
302,477 Are you busy
231,873 Re: Forum
216,498 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.7.5