ECN Electrical Forum - Discussion Forums for Electricians, Inspectors and Related Professionals
ECN Shout Chat
Shout Box
Recent Posts
Video: Inventor of the GFCI self-testing shocks
by Bill Addiss. 01/17/18 11:11 PM
FPE in Germany
by HotLine1. 01/17/18 07:07 PM
VDE 0100 to introduce AFCIs
by LongRunner. 01/17/18 10:32 AM
Fujifilm Recalls Power Adapter Wall Plugs
by Admin. 01/16/18 07:04 PM
Air Compressor feeder conductor sizing
by Potseal. 01/15/18 09:08 PM
New in the Gallery:
Housebilding DIY wiring
SE cable question
Who's Online Now
0 registered members (), 14 guests, and 9 spiders.
Key: Admin, Global Mod, Mod
Previous Thread
Next Thread
Print Thread
Rate Thread
Watch them meters! #197549
12/06/10 08:11 PM
12/06/10 08:11 PM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
From Stuff:

Meter blast sounded like bomb:

A power meter board explosion which caused a fire at Parklands shopping centre was so loud it sounded like a bomb going off and was so hot it turned steel to liquid.

Riddick Electrical owner Blair Riddick, whose company had been contracted to rewire the building, said the intensity of the electrical fire was so great it warped steel roofing beams and turned a 4mm thick meter board cover into molten steel.

"People said it sounded like a bomb going off," Mr Riddick said.

The repair job would be massive, he said.

All but two shops affected by the fire on Friday were back up and running yesterday and the landlords were keen to let customers know.

Westwill Properties director Glenys Waters said there were very few customers at Parklands yesterday despite all businesses opening, except for the library and the supermarket.

"People aren't around today because they think everything is closed," Mrs Waters said.

Builders and electricians had been working around the clock to repair the fire damage and set up two generators, she said.

"The electricians have been brilliant doing everything they possibly could."

Supervalue supermarket, which was extensively smoke-damaged, would take at least two weeks to reopen, she said.

"It's a mess. She has to start from scratch, there's nothing she can salvage," he said.

Virtually 100 per cent of stock would be thrown out due to smoke damage, she said.

"Smoke leaves an oily residue and you can't get rid of it."

Puke Ariki manager Bill Macnaught said the library was expected to open next week.

"We have some water damage to the carpet and a bit of smoke residue in the library, but the big problem is the lack of power," Mr Macnaught said. No books were damaged in the fire.

Books that were borrowed from the library could be returned to Puke Ariki or any other library in the district, he said. As of yesterday all other shops were operating within their normal working hours.

Four fire crews were called to the centre on Friday afternoon after the supermarket power meter board malfunctioned.



Test Equipment:
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Large Selection of Test Equipment For Electrical, HVAC, Test & Measurement
Re: Watch them meters! [Re: Trumpy] #197550
12/06/10 08:41 PM
12/06/10 08:41 PM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,917
Brick, NJ USA
Trumpy:

Sounds like a really serious fault within a piece of switchgear. Any info on a cause?



John
Re: Watch them meters! [Re: HotLine1] #197552
12/07/10 01:01 AM
12/07/10 01:01 AM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Hi John,
I can only guess at this stage of the game.
It sounds to me like the Power Company had long since upgraded their mains and transformer gear, but the equipment that was still in place at the shopping centre, had a lower PSCC limit than the NEW fault current level.

It failed to handle the new fault level and pretty much blew itself to bits.
BTW, this probably has very little to do with metering at all, as the meters that would have been installed would have been fed via CT's.

I would imagine what actually exploded, would have been the Main Circuit Breaker feeding the whole shopping centre, given that all of the shops lost power and that the blast was so large.

This is however only as I said, a guess. frown

Re: Watch them meters! [Re: Trumpy] #197557
12/07/10 09:39 AM
12/07/10 09:39 AM
HotLine1  Offline

Member
Joined: Apr 2002
Posts: 6,917
Brick, NJ USA
Trumpy:
Thank you for the above. That's what I thought!

Within your comments you used 'PSCC' which I think is your terminology for 'Fault Current' on this side of the world.

There's another thread here with a deep debate on terminology for Fault Current (KSCA/KAIC/etc) which was getting testie; have you seen it?

Take care & stay safe!


John
Re: Watch them meters! [Re: HotLine1] #197564
12/07/10 05:50 PM
12/07/10 05:50 PM
Trumpy  Offline
OP
Member
Joined: Jul 2002
Posts: 8,231
SI,New Zealand
Yes John,
PSCC= Prospective Short Circuit Current.

Re: Watch them meters! [Re: Trumpy] #197565
12/07/10 09:07 PM
12/07/10 09:07 PM
F
frenchelectrican  Offline
Member
Joined: Feb 2003
Posts: 939
Wi/ Paris France { France for ...
Mike.,

Just wondering when any time your POCO do the upgrading their system do you have to warn the customer of new level of PSCC level ?

And what the typicl PSCC level you have in your area ?

Merci.
Marc


Pas de problme,il marche n'est-ce pas?"(No problem, it works doesn't it?)


Featured:

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

 

Member Spotlight
watersparkfalls
watersparkfalls
Washington...Not DC
Posts: 222
Joined: March 2005
Show All Member Profiles 
Top Posters(30 Days)
sparky 22
Admin 20
Potseal 13
Popular Topics(Views)
243,533 Are you busy
180,337 Re: Forum
170,826 Need opinion
Powered by UBB.threads™ PHP Forum Software 7.6.1
(Release build 20180101)
Page Time: 0.019s Queries: 15 (0.004s) Memory: 0.9781 MB (Peak: 1.1240 MB) Zlib enabled. Server Time: 2018-01-18 09:53:12 UTC