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Sharky

Shark Tank

Where's the fire?

Pilot fish discovers that the fire alarm in this university data center doesn't actually alert the fire department -- and it's during a small crisis, but fortunately not a fire. He notifies the proper people, but was the problem resolved? "Flash forward about three months," says fish. "A high school group was touring the facility, and on the way out, they were told to push the red button on the wall, which keeps the door open without setting off an alarm. One Chinese exchange student confused "push" with "pull." I came back from lunch to four fire trucks, three police cars, the student media center van and one very, very frightened exchange student who was scared to death that she was about to go to jail, regardless of how many of our administrators kept telling her it was an accident. I saw my boss on the way in and said, 'I guess they really did fix that alarm, didn't they?'"

Aha!
Boss asks pilot fish to take a user's PC back to the workshop because the PC is overheating and rebooting randomly. "I run a diagnostic test but can't find the problem," says fish. "So I load the PC into my car to take it to the workshop." Halfway there, his cell phone rings. It's the user, who's back from lunch and is complaining that not only hasn't fish fixed the problem she reported, but now the screen is blank and her keyboard doesn't respond. Didn't you notice that the big beige box is missing? fish asks. User: "Oh, is that part of my computer?"

How Not to Save Money
It's 1991, and this small Danish company uses Unix workstations for its software development. When it's upgrade time, the sysadmin backs up each workstation's data on a single tape drive. "The upgrade went fine, so the sysadmin made ready to reinstall user data," reports a pilot fish on the scene. "This time, he placed the tape drive close to his own workstation. He didn't have an outlet nearby, so he strung two extension cords together. He powered up the tape drive -- and when he flicked the power switch, the tape drive went poof. Turns out his extension cords were homemade, and in one of them, phase and neutral were exchanged. This is not usually a problem -- but when you connect it to another extension cord where neutral and ground are exchanged, all of a sudden, you get 220 volts on the chassis ground. It took four days to get a new tape drive, and the workstation users were more or less reduced to using pencil and paper."

Sharky's ready to kick back by a holiday fire. I'll be back in the Jan. 7 issue, but until then, don't forget to fill my stocking at sharky@computerworld.com with your true tale of IT life. You'll get a warm, cozy Shark shirt if I use it.

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Swim on over to Shark Bait and share your tales of woe: sharkbait.computerworld.com.

What People Are Saying

ha! most of u r electircians!

..right? or ur wrok is close to that.

Yep

I was an electrician in my former life before trading my Fluke meter for a 486.

u shouldnt have traded the meter...

...you'd still need it for testing the components.

heh, i am budgeting to buy a meter and approval from boss, just to test these murderous laptop power adapters and some funny power cables.

Your Volts my Volts...

As a Brit who has worked in just about every main european country I can confirm that the single phase voltage is normally 220/230v. The wiring colors are Green/Yellow Ground, Red Live, Blue Neutral these are EU colors. The UK uses what is known as a 13Amp Plug (because it has a fuse in it up to 13A)it can't be plugged in the wrong way round, whereas in most of the rest of Europe the Schuko system is used which is basically a 2-pin system with a Ground contact pin, which can be plugged in either way!

I recall some years ago when the IBM XT was used on one of our machines & would normally be plugged into our system that provided the 115V, a Norwegian customer decided to swap the molded lead with the norwegian equivalent so he could move the system nearer to his location, he was a little surprised when a loud bang came out of the back of the XT followed by smoke!! 220V & 115v system don't mix well...

Electronic does not equal electrical

Disclaimer: First off, I have the wrong 'E' in my title to answer this competently so if I make a mistake, please keep the crucifixion to a minimum.

Anyone who has been to the other side of the pond knows that if you plug an appliance made here into electricity made there - you get sparks unless there is some kind of adapter involved. This leads me to the inescapable conclusion that their electricity runs the other way (sorta). The Phase, Neutral, Ground, Hot, Cold, Tepid, Jiggly and Hair-Raising wires are all different over there.

Ok, so an electrician I'm not.

I do know one thing about wiring though. Home-made extension cords are a stupid idea under the best of circumstances and I would NEVER plug electronic equipment into one. EVER.

AD

For those of you remembering the troops deployed this Christmas, remember shipments from the States have to be shipped 'Express' on or before Dec 22 to get there by Christmas.

220V

The EU uses 220 from the wall. The submitter is absolutely correct about crossing the ground and neutral wire. It would have put voltage on the chassis. The rest is history so to speak.

no 200v available

If there was 220v available by plugging together two extension cords, it was the wall outlet, not the extension cords at fault. There is no way defective cords could produce 220v output from a properly wired 110v outlet. More likely it was a 220v outlet. He'd better have someone check that one out before something worse happens.

Actually, it IS possible...

If the idjit wired the extension cord so that the neutral (white) wire were connected to the ground (bare copper) location, then you WOULD be pumping 220(ish) volts across the wire, because in order to develop that voltage, most systems use the "neutral" line to carry 120 volts, and the black or "hot" line to carry the other 120 volts. There is no "neutral" line in this kind of setup. Only earth ground, and if you connect a hot wire to the ground, then you're putting 240v over the loop. Snap, crackle, POP.

My $0.02 worth.

CatFISH

Like Rhialto said...

...European outlets are all 220v/230v. And regardless of the terminology and/or electrical knowledged used and possessed by fish, I can easily see how two homemade extension cords, especially when hooked back-to-back, could fry electronics.

It can be done.

As the current is alternating, it is possible to switch hot (phase) and neutral and have things work just fine. It is also possible, if the circuit breaker panels in Europe are setup the same as the US -- neutral and ground are actually joined at the circuit breaker panel, to switch neutral and ground without any problem. However, when we cascade the mistakes, as here, then we have a problem.