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#117735 07/06/04 07:52 AM
Joined: Dec 2000
Posts: 4,287
Member
Quote
This fascinated me. I thought the group might enjoy it.

A tree branch took out a service drop, pulling the riser and the trough off the building. Aluminum siding!!!

It’s a 200A 3-Ø Commercial service with 3/0 cu. Steel raceway to the weather head, the trough is pulled off and it is visible hanging over the Gas Meter and Vent. The fire dept shut down a two lane state highway. And stood back until the utility arrived.

The Fire Dept reported that the service arced bright blue on the ground for 20-30 minutes waiting for the utility to cut the lines. The transformers were a 3-Ø pole mounted bank less than 200 feet (of wire) away.

Charlie Palmieri


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Quote
You can see the burn where the pipe and riser conductors laid on the ground. There is approximately 10 feet missing (it incinerated) The Fire fighters said that steel will relax when it’s temperature reaches near 1500F. I do not know what the available short circuit current was. I had to leave for vacation the day after the incident.
CP

#117736 07/06/04 09:37 PM
Joined: Nov 2003
Posts: 269
E
Member
I dont even want to think about what would have happened had that gas equipment went. [Linked Image] [Linked Image]


John
#117737 07/06/04 09:37 PM
Joined: Sep 2003
Posts: 119
C
Member
They are very lucky that when it fell it did not take out that gas meter. or they would have had a bigger fire, Maybe even the whole house


Theres always enough room in the junction box.You just need a bigger hammer
#117738 07/06/04 10:24 PM
Joined: Apr 2002
Posts: 2,527
B
Moderator
Speculation, of course, but service riser turned to lawn fertilizer may have been from a primary-to-secondary fault in the transformer.

Peeling of the raceway from the building probably saved a “structure
fully involved” report.




[This message has been edited by Bjarney (edited 07-06-2004).]

#117739 07/06/04 10:43 PM
Joined: Jan 2002
Posts: 1,457
E
Member
Yikes what a mess. By the way, Is this the same Charlie Palmieri that is an excellent code instructor here in Mass?

#117740 07/06/04 10:55 PM
Joined: Feb 2004
Posts: 1,437
Member
WOW!
Curious about something here... Was the gas service bonded to the EGC? (Or formerly when the panel was actually in place?) This looks like a house, with a 3 phase service? Something you don't see here everyday... People that live here have someone watching over them!

-Randy

#117741 07/07/04 12:31 AM
Joined: May 2003
Posts: 2,876
E
e57 Offline
Member
Quote
service riser turned to lawn fertilizer may have been from a primary-to-secondary fault in the transformer.
I figure first short in riser, then another short in transformer. But is it good for the lawn?

(Sorry, I couldn't resist, I'm sure this scared the people there out of thier minds! They are lucky!)


Mark Heller
"Well - I oughta....." -Jackie Gleason
#117742 07/07/04 07:52 PM
Joined: May 2004
Posts: 162
C
Member
The occupancy was a commercial motel. The fire department was extremely concerned that the entire area was in peril if the gas touched off. They blocked off a stat highway until the utility was cut, and maintained a considerable distance.

#117743 09/15/06 12:37 AM
Joined: Oct 2004
Posts: 806
Member
Bumping this up..facinating example of utility fault current damage!


Stupid should be painful.
#117744 09/15/06 01:59 AM
Joined: Feb 2006
Posts: 144
N
Member
Show this to anyone who douts the power of electricity. Imagine being on the other side of the wall. It also reinforces the point about having proper distance between utilities. This could have been soo much worse if that gas meter was in a worser spot.

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