ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
334.80 and fire caulk
by gfretwell. 06/21/18 11:35 AM
Calling all Non-US members!! (Non-US only)
by HotLine1. 06/13/18 01:50 PM
GE Lighting Recalls LED Tube Lamps
by Admin. 06/12/18 09:32 PM
Ketra Recalls Recessed Downlights
by Admin. 06/12/18 09:17 PM
diazed fuses
by Texas_Ranger. 06/11/18 07:31 AM
New in the Gallery:
Plug terminals
Housebilding DIY wiring
Who's Online Now
0 registered members (), 39 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Lift Station Kaboom #165437
06/27/07 07:43 PM
06/27/07 07:43 PM
electure  Offline
OP
Member
Joined: Dec 2000
Posts: 4,268
Fullerton, CA USA
From Lone Gunman

Quote
This is by far the worst fire/kaboom I've seen in person and had to repair.

The meter still hanging on the rack is a 480v service for a parking lot lighting at a Lowes. We are not contracted to repair this.

The meter pictured on the ground was to the right of the Lowes meter and is a 120/208v three phase service for a county lift station. It fed a 100a three phase disconnect located 10' to the left of the rack.

Poco claims the cause was a lightning strike. The #4 solid ground wire was intact and connected to a 5/8" ground rod.

Both services are fed from different transformers with both being 200' away or so.

The picture of the disconnect panel covers shows them bowed out from the blast and you can see the disconnect also bowed out, no fire damage though.

The picture of the 4 #1's show they are all fused together, this was down in a RMC 90 which they used to go from PVC to RMC.

The picture of the closed PoCo hand hole shows where the PVC STOPPED, The wire was not protected from the end of the conduit shown to inside the hand hole.

I'd like opinions of whether you guys think lightning did this, I'm thinking it was a phase to phase short



[Linked Image]


[Linked Image]


[Linked Image]


[Linked Image]


[Linked Image]


[Linked Image]

Tools for Electricians:
Re: Lift Station Kaboom [Re: electure] #165439
06/27/07 07:44 PM
06/27/07 07:44 PM
electure  Offline
OP
Member
Joined: Dec 2000
Posts: 4,268
Fullerton, CA USA
Here are a few more pics:


[Linked Image]


[Linked Image]


[Linked Image]

Re: Lift Station Kaboom [Re: electure] #165473
06/28/07 12:58 PM
06/28/07 12:58 PM
S
ShockMe77  Offline
Member
Joined: Jun 2005
Posts: 821
Rahway, New Jersey
Perhaps the wrong available interupt current rating on the main disconnect.

I've seen some fried things before and that ranks right up there with the best of them.

Re: Lift Station Kaboom [Re: ShockMe77] #165484
06/28/07 06:21 PM
06/28/07 06:21 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,973
Brick, NJ USA
IMHO, the lightning theory may be right. Had two similar at two different Golf courses, 120/208 for well pumps. 100' to the pots (OH to UG).

John


John

Featured:

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

 

Member Spotlight
AllClear
AllClear
Belmond Iowa US
Posts: 44
Joined: August 2005
Show All Member Profiles 
Top Posters(30 Days)
twh 5
Popular Topics(Views)
247,675 Are you busy
184,993 Re: Forum
174,297 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.020s Queries: 15 (0.005s) Memory: 0.9620 MB (Peak: 1.0949 MB) Zlib enabled. Server Time: 2018-06-23 07:55:29 UTC