The Electrical Contractor Network

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

Books, Tools and Test Equipment for Electrical and Construction Trades

Page 1 of 2 1 2 >
Topic Options
Rate This Topic
#114748 - 06/20/03 02:30 PM Hot Lamp!
Webmaster Offline

Administrator
Member

Registered: 10/07/00
Posts: 3142
Loc: NY, USA


 Quote:
There was a short in the fixture containing this lamp.

It got so hot that it melted an indentation about 1/4" deep X 1" diameter into the lamp.
I remember seeing staggering statistics regarding the temperatures developed during shorts, the amount the actual burned copper expands, etc.

Does anyone here have this information?...S
(Electure)

Top
Tools for Electricians:
#114749 - 06/20/03 10:19 PM Re: Hot Lamp!
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...

Top
#114750 - 06/22/03 10:33 PM Re: Hot Lamp!
ThinkGood Offline
Member

Registered: 08/07/02
Posts: 1084
Loc: Milwaukee, WI

Top
#114751 - 06/23/03 07:45 AM Re: Hot Lamp!
HotLine1 Offline

Member

Registered: 04/03/02
Posts: 6804
Loc: Brick, NJ USA
Looks like a 1000 or 1500 watt mh/mv bulb!
Nice "toast" job.
John
_________________________
John

Top
#114752 - 06/23/03 08:12 AM Re: Hot Lamp!
mamills Offline
Member

Registered: 11/30/01
Posts: 739
Loc: Wharton, Texas, USA
Electure:
Kinda curious to know, how did this situation resolve itself (i.e. fixture burnout, OCPD trip, etc.)? I've seen them before where the inner envelope was completely disintegrated, but not burned like this one.

Mike (mamills)

Top
#114753 - 06/23/03 09:56 AM Re: Hot Lamp!
Bjarney Offline
Moderator

Registered: 04/10/02
Posts: 2561
Loc: West-Southern Inner-Northeast ...
It’s been a few years, but I think MH-lamp producers have designed in a fusible link between the inner and outer lamp envelopes that is supposed to melt open if exposed to air for ±30 minutes.

But now, in Anaheim I’ve heard they use a dozen 1500W models in each of their industrial-grade tanning booths at local juice bars. ;-) [Sorry, Scott. Couldn’t resist… You can post some bad jokes about Yreka if you want.]




[This message has been edited by Bjarney (edited 06-23-2003).]

Top
#114754 - 06/23/03 11:36 AM Re: Hot Lamp!
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
It's a 1000 watt Metal Halide.
The guys "reversed the optics" (spun the reflector), and ran the wires right over the lamp.
Mama mia, these things get hot. I'll get a pic of the rest of the reflector, and send it to Bill.
("Off the wall" memory thing...Seems 7000°F)??...S

Top
#114755 - 06/24/03 07:31 PM Re: Hot Lamp!
ThinkGood Offline
Member

Registered: 08/07/02
Posts: 1084
Loc: Milwaukee, WI
Anybody here familiar with a "breakdown test set" used by some telcos? I believe it actually welds copper conductors together to make that pesky cable fault easier to locate. They send around 650VDC over the copper...

Top
#114756 - 06/26/03 05:40 AM Re: Hot Lamp!
electure Offline

Member

Registered: 12/24/00
Posts: 4226
Loc: Fullerton, CA USA
Bjarney, Doesn't Yreka sell lots of these 1000 watt lamps to the marijuana farmers??

Top
#114757 - 06/26/03 07:52 AM Re: Hot Lamp!
ThinkGood Offline
Member

Registered: 08/07/02
Posts: 1084
Loc: Milwaukee, WI
Just don't sell them flash bulbs ...

Top
Page 1 of 2 1 2 >



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