ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals

Topic Options
Rate This Topic
#165437 - 06/27/07 04:43 PM Lift Station Kaboom
electure Offline

Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
From Lone Gunman

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

Tools for Electricians:
#165439 - 06/27/07 04:44 PM Re: Lift Station Kaboom [Re: electure]
electure Offline

Registered: 12/24/00
Posts: 4259
Loc: Fullerton, CA USA
Here are a few more pics:

#165473 - 06/28/07 09:58 AM Re: Lift Station Kaboom [Re: electure]
ShockMe77 Offline
Registered: 06/11/05
Posts: 821
Loc: 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.
#165484 - 06/28/07 03:21 PM Re: Lift Station Kaboom [Re: ShockMe77]
HotLine1 Offline

Registered: 04/03/02
Posts: 6776
Loc: 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).


Member Spotlight
Member Since: 01/22/05
Posts: 5316
New in the Gallery:
SE cable question

2017 NEC and Related
2017 NEC
Now Available!

Shout Box

Who's Online
1 registered (sparkync), 67 Guests and 8 Spiders online.
Key: Admin, Global Mod, Mod
New in the Gallery:
SE cable question
Top Posters (30 Days)
Admin 49
HotLine1 43
gfretwell 18
Ruben Rocha 12
Trumpy 9
Newest Members
Freecrowder, clee512, Jdscott2005, FAIZAN, Regitest2

ECN Electrical Forums - sponsored by Electrical Contractor Network - Electrical and Code Related Discussion for Electrical Contractors, Electricians, Inspectors, Instructors, Engineers and other related Professionals