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The sub box is contoured to fit/bolt under the carpet in the passenger footwell, so a new housing is going to be a pain. A 1 ohm 5.25" sub is... well I can't find one for sale let alone a neodymium one.
I looked over the Dice.com annual tech salary review earlier this morning. What I found interesting was that Minneapolis was #4 for "Top Tech Metros by Salary" and #1 when adjusted for cost of living.
I guess companies have to open up the checkbook to get people to want to stay and live with winters like that?
I got a great candid shot of my daughter playing in my car. Moments like these make me hope we can share a hobby, but maybe she'll just want to collect molds spores and fungus or something.
Well, this has been a fun day. Just got home from the transmitter.
We went off-air just as I got into the station this morning. Power failure at the Sears Tower transmitter. Got online with the backup at Hancock Tower in under two minutes, thanks to clear thinking and good communication from all involved. Serious professionalism all around.
Wanna know the root cause? During demolition work on the 100th floor, someone accidentally tripped a 3,000 amp 480v breaker.
Let that sink in. Someone tripped a 3,000 A breaker.
That undoubtedly caused a loud noise and a bright light. And yet no one has fessed up to the incident. I'd have thought it would have been as easy as looking for the electrician with an obvious urine stain in the front of his pants.
Well, this has been a fun day. Just got home from the transmitter.
We went off-air just as I got into the station this morning. Power failure at the Sears Tower transmitter. Got online with the backup at Hancock Tower in under two minutes, thanks to clear thinking and good communication from all involved. Serious professionalism all around.
Wanna know the root cause? During demolition work on the 100th floor, someone accidentally tripped a 3,000 amp 480v breaker.
Let that sink in. Someone tripped a 3,000 A breaker.
That undoubtedly caused a loud noise and a bright light. And yet no one has fessed up to the incident. I'd have thought it would have been as easy as looking for the electrician with an obvious urine stain in the front of his pants.
3-Phase, I presume. And breakers are not typically current limiting as many fuses are. Thus I would expect some arc flash that released considerable energy.
That undoubtedly caused a loud noise and a bright light. And yet no one has fessed up to the incident. I'd have thought it would have been as easy as looking for the electrician with an obvious urine stain in the front of his pants.
How does one manually trip a 3000amp breaker, accidentally or otherwise? Is there a button you push?
The main breaker handle is a lever about a foot long. You need to put your whole body weight into it to move it manually.
There's a little **** that you can rotate 1/2 turn to force a trip, kind of like the "test" button on a GFCI. But I can't imagine it getting turned accidentally.
It's similar to this unit. Not the same model (this one has pushbuttons rather than a ****) but same basic scale:
No, I think this one got tripped the old fashioned way. There were several electricians working on the floor, specifically tearing out the feeder cables going to the power supplies for WFLD's old transmitter, and I think someone actually shorted a cable to ground. Can't prove it, it's just the most likely explanation.
I'm no electrician, but it stands to reason that a 3000 amp arc to ground would leave *some* kind of recognizeable mark. Just follow your hot wire until you find it near by?
I'm no electrician, but it stands to reason that a 3000 amp arc to ground would leave *some* kind of recognizeable mark. Just follow your hot wire until you find it near by?
This is outside my area of control, and I also didn't get to the site until about an hour after it happened.
I agree, there was likely some evidence, but it seems to have been cleaned up quickly.
Location: Detroit (the part with no rules or laws)
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Originally Posted by Joe Perez
The main breaker handle is a lever about a foot long. You need to put your whole body weight into it to move it manually.
There's a little **** that you can rotate 1/2 turn to force a trip, kind of like the "test" button on a GFCI. But I can't imagine it getting turned accidentally.
It's similar to this unit. Not the same model (this one has pushbuttons rather than a ****) but same basic scale:
No, I think this one got tripped the old fashioned way. There were several electricians working on the floor, specifically tearing out the feeder cables going to the power supplies for WFLD's old transmitter, and I think someone actually shorted a cable to ground. Can't prove it, it's just the most likely explanation.
Small.
The 4000+ amp ones have massive springs. They are charged, ratchet style with a small handle. Then you push a small finger sized button to release the lock that is holding back the spring pressure.
I've been next to one when they snap open. That's why I keep extra underwear. They can sometimes cause a surge on the entire block.
You should see the 13000volt fuses I have back home. I wish I had a picture but I'm out of town.
Instead check out this line.
Also this wire tray I was digging through earlier. Not low voltage.
The 4000+ amp ones have massive springs. They are charged, ratchet style with a small handle. Then you push a small finger sized button to release the lock that is holding back the spring pressure.
I've been next to one when they snap open. That's why I keep extra underwear. They can sometimes cause a surge on the entire block.
Our newer stuff is of the style you describe. Here's the switchboard for my auxiliary transmitter at Hancock:
This one is 800A @ 208V, so a lot smaller. But this switch is just for my room. The one that tripped at Sears serviced the whole of the 100th floor and, unknown to me, part of the 98th floor, which is where my main transmitter is.
This was part of the "old" infrastructure at Sears. The new distribution room (which is under construction right now) is more modern.
While up at Sears yesterday, I noticed some plumbing on the wall I'd never noticed before:
This isn't in my room, it's in the common space on 104 which contains all of the big coolant pumps for the building, as well as some of the elevator machinery, etc. Here's a close-up of one of the devices at the corner:
My first thought was that it's a pyrotechnic actuator, but some googling suggests it's a thermocouple sensor. Four of them in a row? This arrangement makes no sense to me.
10-14-2019, 12:07 PM
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