View allAll Photos Tagged Grounding
Wendy used a hollow tamper to sink our AC and DC grounding rods. Smoke
ran the rest of the copper grounding wire (#6 AWG).
If you look at where electricity comes into your house, you'll notice 3 wires. Since the grounding is done with a pipe at your house, why do you need three?
It turns out that most of the plugs in your house connect a "hot" wire (usually colored black) to the device, and a "neutral" wire (usually colored white) as well. In the hot wire, the voltage is 120V AC, which varies from zero to a maximum 60 times every second. By putting these two wires on, current will flow in the device and switch direction as the voltage in the hot wire does.
The neutral wire is inherently safer, because it's at the same voltage as the ground and a person. If you accidentally touch a hot wire, you'll get shocked because of the voltage difference. If you accidentally touch only a neutral, nothing will happen.
Thus, we wire switches to devices in the hot wire. This means when it's off, nothing in the device is energized. If we put the switch in the neutral, stuff inside could still be at high voltage and dangerous if we touch it.
A good discussion of the safety benefits of polarized plugs can be found in this thread:
arstechnica.com/civis/viewtopic.php?t=828563
The other wire, seen at the bottom of this board, is also hot. But it's the mirror image sine wave. Half the outlets in your house are wired between neutral and one hot, and the other half between neutral and the other hot.
You also can get 240VAC by wiring a device across the two hot wires. Note that this is different than the 240VAC you get in other countries, where you have one hot and one neutral (Seen at right in this photo.) The device may work, but if having a neutral wire is essential for safety then you won't have it.
On the next picture you'll see a common 240V plug found in older buildings in the United States. One of the pins is wired to neutral and the other two to the opposite hot wires. A more modern outlet has replaced this that has a separate grounding pin.
I was gardening yesterday, cutting back, pruning and generally tidying up! Glad this challenge wasn't last week!!
Our Daily Challenge ~ Ground or Grounding ....
Thanks to everyone who views this photo, adds a note, leaves a comment and of course BIG thanks to anyone who chooses to favourite my photo .... thanks to you all.
This was taken during the long grounding of all F-15 A-D aircraft last year. The spiderweb kind of summed up how we felt about not being able to do our jobs. It was very difficult to get the rainbow effect on the web (I'm still a beginner) It took a couple hundred shots to get one I liked.
AS people knew the coming of UNMISS they come to grounding mill. Six thousand internally displaced people at Kuda 54 kilometers west of Juba town are appealing for urgent humanitarian assistance.
The IDPs fled their homes two weeks ago after the SPLA clashed with a group of armed men. The IDPs said they have no food, water, shelter and medicine in the bushes where they sought safety. The IDPs said they are in the bush because we fear, no clean drinking water.” adding that their children don’t go to school.” An UNMISS assessment team visited the area to assess the humanitarian and security situation. UNMISS Civil Affairs Officer Anne Schuit, said the Mission would engage the humanitarian community to provide much needed support
Try or no try?
The grounding is over the line, so it's just a case of who touched first.
The try was disallowed, but they did score 20 secs later.
I'm not sure even a TV slow mo would reveal the real answer. Maybe it was a tie. In that case who gets the benefit of the doubt?
South Island Secondary Schools Touch Rugby tournament 2013.
St Thomas of Canterbury College (yellow) playing Nelson Boys.
Nelson Boys held out 8-7 to qualify top for the next days play.
Close-up of the SRB Utility Tunnel, showing grounding wires, to prevent static electricity near the live ordnance (high explosive) of the Range Safety System.
No cell phones or any radio transmission on the MLP.
You can't shut off the SRBs once they're lit, so if the Shuttle loses guidance on ascent and heads towards a populated area, the Range Safety System splits open the SRBs lengthwise, neutralizing their thrust. It's not automatic -- Cape Canaveral Air Force Station pushes the button to activate the RSS.
A life boat and other debris are visible January 8, 2013 on the shore line of Sitkalidak Island near where Shell's Kulluk ran aground. The Kulluk, a circular drill barge without its own propulsion, ran aground New Year's Eve in a powerful storm off the coast of Sitkalidak Island in Alaska. It was being towed to Seattle for maintenance before it ran aground. Photo by Greenpeace
I slipped off shoes and socks for a three mile jog on the athletic fields. So invigorating feeling the cool, dewy grass underfoot first thing in the morning.
100/365 April, 10th, 2010
Woo! Reached the Triple Digits! this is hugeee! Although this is not a good photo, Again -sigh-, I can't believe I've made it so farrr! And with all of the crap that's been going on, And The Groundings that kept me from my Computer, and the Camera Mishaps. So Hectic.
CONGRATULATIONS CAITLYN & KASEY!!
They made it to Day 100 with me! I'm so proudd!
Caitlyn's Flickr - Photo-Stream.
Kasey's Flickr - PhotoStream.
Let me start this whining by saying that the customer was right. I messed up.
A while back I bought this Madbean Mangler board to try out their negative-ground Fuzz Face circuit. It makes for a Fuzz Face that isn't picky about 9-volt adapters and that's nice. I'd kind of tossed it aside and I finally decided to stick it in an enclosure and sell it to get it out of here. I had an enclosure I'd drilled for a single-knob Rangemaster circuit that I ended up not liking, so I drilled a second hole, but the holes aren't exactly spaced perfectly. So I was only asking $50 for the pedal. And I said in the description that it was some spare parts I'd thrown together to make more room in my work area.
So the buyer gets the pedal and says the 9-volt jack is dead and the pedal just screeched when he was trying to play through it. And I immediately knew what was wrong. The PCBs in these little PCB builds move around some and it had grounded out against the back of the pots. I suggested that he cut a piece of cardboard the same size as the PCB and slip it between the PCB and the pots, but he had no interest in fixing the problem, so I took the pedal back.
I opened it up today, moved the board around until it wasn't touching the pots anymore and it magically came back to life.
I never think of protecting the back of the pots because I don't usually do PCB builds and that isn't on my mind. But here's the way the kids do it these days, for anyone who might be curious. "Pot Condoms" that slip on over the back of the pot. Keeps the pot from grounding out on the back of the board. Ten seconds to do the job right, but I'm a dinosaur and that job never actually occurred to me.
Dialog on Land and Security, Grounding Peace and Stability Plenary, Dennis Hamro-Drotz, Programme Officer, UNEP
At this first stage of the carving an even floor is made around and between the decorative elements in order to bring them up into bas-relief.
Three days of left brain analytical work needs some emotive and creative right brain 'mind breaks'. Here's one that we used. . . . some interesting choices amongst the partners. Not everyone wrote a quote on their choices but it allows the mind to drift for a short while - great tool for deep thinking!
pre aluminum foil, grounding the lockwasher to the shielded part of the rg174, the other side of the shield is to the ground on the board.
Static Grounding Clamps :www.kunlunequipment.com/product_fenlei.php?fenlei_id=61
Static Grounding System :www.kunlunequipment.com
Now our safety tools have over 300 ranges of products, over 5000 specifications. According JISM7002-96 of Japan and GB 10686-89 of China to make inspection cause the tools 100% are acceptable. These tools can avoid rising sparking when tools strike, rub or collide with target in explosive atmosphere or flammable vapors and widely used in oil and gas works, petrol-chemical plants, explosive manufactories, mines, shipyards, pipeline construction, armed forces, pharmacy, airports and many other
2022 Grounding the Green New Deal: A Summit on Design, Policy, and Advocacy (Credit: Allison Shelley/Landscape Architecture Foundation)