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Author Topic: Another Big- Assed Knife Switch !!  (Read 4096 times)
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WD8BIL
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« on: January 17, 2008, 12:28:47 PM »

Used for a short circuit test on a 48VDC 2000 amp system.
Short circuit current is 2700 amps. Now running for 2 hours.

The white thingee on the table is a 12" engineering scale.




* 2700A01.JPG (56.59 KB, 640x480 - viewed 390 times.)

* 2700A04.JPG (60.56 KB, 480x640 - viewed 384 times.)
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Todd, KA1KAQ
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« Reply #1 on: January 17, 2008, 01:54:05 PM »

These things rock, Bud. I have a wall at home in the museum room called 'the wall of knives' with big copper & slate switches like this. Biggest one is about the size of this one, but a three pole, double throw. Drove by an old mill/machine shop one day and they were ripping out all of the belt drive pulleys and other goodies from days of yore. Sitting on top of the pile was the switch. Asked one of the workers if I could have it, to which he replied "I don't think anyone will miss it" and it leaped into the bed of my Land Rover. Solid copper, inch-thicks slate base, h-e-a-v-y.

Eventually the permanent radio room will get set up with open wire feeders and all, allowing some of them to actually get used! Cheesy

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known as The Voice of Vermont in a previous life
WD8BIL
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« Reply #2 on: January 17, 2008, 02:27:21 PM »

We got'em bigger over in the systems integrity lab, Todd. One rated at 10KA CCS !!
Most I've had thru one here is 4200 amps. You definitely wanna kill the AC before opening that at full load. Talk about a ZZZZZZZZZZORCH !!!!!!
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WA1GFZ
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« Reply #3 on: January 17, 2008, 03:00:14 PM »

You guys ain't seen nuttin till you seen LTI's work shop. They can make 200,000 amps or 2,000,000 volts. (they can make more volts but they flash over to the metal roof) Their lab looks like a place Steinmetz or Tesla built. I have never seen that many big caps in one place......They even have a hundred die- hards in series. I'm hoping to go to a week training course on lightning this spring. 
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WD8BIL
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« Reply #4 on: January 17, 2008, 03:09:20 PM »

Like this !



* Trip Pix 041.jpg (74.48 KB, 592x400 - viewed 351 times.)
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WA3VJB
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« Reply #5 on: January 17, 2008, 03:10:21 PM »

Quote
Did someone say Tesla?  I posses the ghost of Nikola and I am a medium through which you may reach him. --Jack/W8AHB
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WD8BIL
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« Reply #6 on: January 17, 2008, 03:15:58 PM »

Maybe that was Irb's li'l voice in the wilderness.
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N3DRB The Derb
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« Reply #7 on: January 18, 2008, 02:53:15 AM »

I'm gonna hook that one Phred gave me onto a big ass wooden base stained and lacquered and use it to switch my feed-line between the W7FG antenna and the 450 ohm stuff I have going out now.

screw it to a corner junction of wood at the nexus where the 2 workbenches come together so I can reach it from either position without getting up out of the chair.

*energize slopbucket death ray* SWITCH!
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ka3zlr
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« Reply #8 on: January 18, 2008, 03:12:58 AM »

I'm gonna hook that one Phred gave me onto a big ass wooden base stained and lacquered and use it to switch my feed-line between the W7FG antenna and the 450 ohm stuff I have going out now.

screw it to a corner junction of wood at the nexus where the 2 workbenches come together so I can reach it from either position without getting up out of the chair.

*energize slopbucket death ray* SWITCH!


..LOL..Excellent Derb....
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