Gun Geek

I think the bullets broke up because they were going fast. I don't thenk the angle had anything to do with it. The would probably break up at 90 too. Guess that's another think they should test.

I kinda came to the same conclusion, and I'm pretty disappointed by it all.

Good idea - see posts 16 & 17 - Eric and I discussed it and over engineered it! I like the copper flashing...

Not enough surface area on the wire (unless it was 100' long, in which case it would foul on the bottom and rip off as the dock went up and down). This is why EricW and I discussed metal plates suspended under the dock. It may be in the plan as well.

Well, they fired a 9mm into a tank of water and it was lethal to about 8' I think. Then they fired a slug into the tank. It was lethal to the same 8', but the blast broke their tank. The tank was an angle iron frame with plexiglas screwed and glued so you could see through the sides. The shotgun blast cracked the Plexiglas and the most of the water ran out (onto their shop floor). They moved to s swimming pool and were firing at an angle (25 degrees, I think). The muzzle loader went wildy off course when it hit the water. The other rifle bullets (223, 30-6, 50BMG) all broke up with in 18" of the surface. Some fragments continued on and might have been dangerous, so the conclusion was that at 3' you'd be OK as long as they were shooting high powered rifles at an angle. The angle thing is a reasonable constraint. If you're going to get shot at, The shooters will probably be at a distance on the shore - producing an angle. I wish they had re-tested the handgun at the angle, to see if it would go deeper. Here's the logic I didn't like: 50 BMG is "fearsome" or "unbelievable" and banned in Kalifornia - they discussed it on the show. The 30-06 and the 223 are "fearsome" and unbelievable" as well - so shouldn't they also be banned?

It is a summer time thing - water! I guess you should just call me Kenny.

Caught a TiVo'd episode of Mythbusters last night. One of the myths was that you'd be safe if you dove underwater when being shot at (i.e. water stopped the bullets). Result was that a slower handgun bullet would penetrate deeper (like 8') but high speed rifle bullets broke up a foot or so into the water and wouldn't get you. They even shot a 50BMG into the water. Cool show! Problem was with the voice-over guy. He consistiently used terms like "fearsome" and "dangerous" and "unbelievable" to describe the speed of the bullets from a rifle (they used a muzzle loader, AR, a Garand and the 50). Maybe I'm over sensitive, but that seems like a very good way to fuel the debates over gun control in general - it conditions non shooters to think that rifles are some amazingly awful force that has to be controlled. I guess I'm disappointed. One of the guys (Jamie) is obviously an enthusiast (he handloads, many of the guns used in the show are his, and they mentioned when they shot the ML that Jamie made the bullets). Sorry if this is too close to politics, for this board, but I had to speak up!

CZs make me nervous. I've seen 3 of them as a USPA RO and an IDPA SO. 2 of the 3 have been ND'd and the guys DQ'd. Actually had one guy argue that since you have to manually drop the hammer, an AD (he insisted it was an AD, not ND) was going to happen and that he should not be DQ'd. I understand why the CZs are built the way they are and I have shot one (and liked it), but to date the failure rate is too high and I will remain very vigilant when I see one. "do you trust yourself & your skill, or do you place your trust 100% in a mechanical device that you did not build?" Obviously I put 100% trust in something I did not build. Everytime the gun goes off, the only think keeping it from blowing my hand and face off is the gun. Sorry, but this is a non-starter argument. When a de-cocker is used the gun is pointed at the berm -I'm not putting 100% trust in it. If it fails, the AD (this time it is an AD if the gun fails) goes in a safe direction. That's not trust. Problems with CZ will be user related, so I'm not advocating a ban. But as an RO/SO I will be damn sure they are pointed in a safe direction when de-cocking. If I see a CZ at LMAR, I make them slow down the process and be very deliberate about where it is pointed with they decock.

Talked to an engineer at a local commercial contractor and got an earful about how much of a bitch ground loops are. He confirmed that it has been more of a problem in the dry weather (we did get some rain from the hurricane). Told me the story of this being a big problem on horse farms - horse standing on ground that is higher potential than the water - gets shocked and won't drink. We have big $$ horse farms around here. Here's the interesting part. He said if it truly is a ground loop, then there is likely nothing to be done that isn't major $$$ (10's of thousands). AND he said that it is common around swimming pools that there is some potential between the ladders and the water, and that code allows 4 - 6 v! I'm seeing 1.5v. He rattled off the measured voltages at the public pools around town. He knows it because he checks it. His point was, if it was shock from a ground loop, don't worry about it! He said to make sure the dock was properly grounded so that a stray hot would not light up the dock, and move on. EEEEK! OK, here's the plan as of now (I tell you this because it will take some time and I don't want you to think I let this go to sleep): 1) Disconnect the service N from the ground rod (If I can do it safely) and see if the shock is still there. If it is, then I am satisfied that this is truly a ground loop problem and not a leakage (N to G) problem. 2) Finish cleaning up some details disconnecting the N to the frame of the dock. 3) I don't like the Triplex going to the dock with a live exposed N, so I'm going to look for a different kind of wire (got some in mind that is 4 insutlated conductors + bare ground in insulation rated for wet locations. It feels like a giant extension cord and I think it is big $$$). OR 4) I may use 2 runs (gives me 4 insulated conductors) of Triplex and just have the metal wire for mechanical connection. Probably will ground it to make sure there's no stray voltages. 5) Drive a couple of ground rods up the hill to improve grounding. It is code here (as of just a little while ago) that you have 2 ground rods (or 1 big honker). This will take a little time, so I'll repost when I get my list done. Keep the ideas coming if you have more!

If the hard sell (junk mail, telemarketers, etc) didn't work they wouldn't do it. Just say no and it will go away... I wish! Barnum was right.

I invite my shooting buddies. Strange - my number of friends seems to be dwindling. You think Clyde would be interested? uhhh- that's me who gets shocked. Wouldn't ask anyone to do anything I wouldn't do

I have disconnected the H (via breakers) and the N (took it apart) and left the ground connected. Shock is still there. I have not disconnected the U Co N from the ground rod to see if the shock still exists. If it does not (ie. the dock ground wire does not touch the U Co N anywhere, but is still connected to the ground rod), the U Co might have ground loop problems of their own. This would dump a bunch of current into my ground point which would cause a voltage to develop. I'll investigate this (though I'm not sure how to disconnect stuff - it will take the power down in the house when I do).

I love it! Keep it coming guys... 1) Yes - triplex terminates in a load center on the dock. The neutral goes to an unbonded (insulated) bus bar in the load center and all white wires gonnect to this bus. A ground was subsequently run down the hill and connected to a bonded (connected to the box which is connected to the frame) bar in the box - see below. 2) Yes 1) Sorta did this - in hope of a fix I ran an insulated ground wire from the ground rod up the hill. Disconnected the N from the frame, connected the G - still get the shock 2) Cain't do it. The bank is rock (limestone). Any soil there (and there is very little) will be only few inches thick and likely to wash away the next time the water comes up. The only soil that might be more than 3" deep is at the bottom the lake, 40' to 50' below the dock.

I find that the "ugly" comes from the use in action pistol sports. I don't think I know of any that see lots use (and dryfire, holstering, reloading) that don't quickly get a bad case of the uglies. Beautiful can certainly run 100%, but if it used for training and matches, it won't stay beautiful very long. Well, the wear of use is a beautiful thing - that's what I tell myself as I get older

It is good to be understood. I talked to the U Co this morning. Their answer was call an electrician. I think this is a standard to keep themselves from getting sued. I'm working to find an electrician who will help with out turning me over to the fuzz. Actually I don't think you can get "turned in". What happens is that if you need help from the U Co they won't give it to you unless there is an electrican involved and things are already up to snuff. Which, I guess makes sense...

Ahhhhh, nobody's listening, I'll go over this again... The N & G are NOT tied together - they never have been. At one time there was no G - The N was tied to the frame of the dock (this is really bad). Now the N is isolated and the G is tied to the dock. The G comes directly off of the ground rod up the hill. You still get shocked, even if the power is shut off and the N is disconnected (leaving only the G connected). Disconnect the G and the shock goes away. Putting in a ground stake on the shore is not an option (unless I rent one of those self propelled drills they use to make blast holes for clearing road right of way). The shore of the lake is solid limestone. I don't have 10' of topsoil at the top of the hill for a ground rod only 3 or 4' then you hit limestone. All plugs are GFCI, and I have tested them by dropping a hot wire into the water. Not picking on you cking - this thread has gotten a little hard to follow, but it is very interesting, so keep it all coming!

X2 X2 X2 neck this is not unpopular with me! Cover your out-of-pocket, your lost wages (even $$ spent by family members), etc. and forget the rest. You're in danger of falling into the "lawsuit lottery" trap (mentioned b4) and helping to drive up the cost of med care all around. Hospitals & Drs should pay reasonably for the consequences of true negligent mistakes - not be punished because of some short term stress and a mistake they caught. Unless I missed something in the post, where does the desire to get medical expenses covered for the other guy come form? If the other person was in that bad of shape, there were likely symptoms and when the x-rays came back neg (while probably lots of other tests were positive), I'll bet the hospital re-ran things and figured it out. Sorry - I know, sounds a little "Libertarian". I don't mean to be, but as I get older... 2 more cents

You talking about the Stoney Point OAL gauge? $30 +/- $2 is about right for this product. I don't think you'll find it significantly cheaper anywhere. Tell us a little more about what you're trying to do and someone might have a slick work around...

George: I think grounding at the service is common practice - maybe even recommended practice. Check the graphic below, the source is: http://www.enm.com/training/siemenscourses/load_2.pdf. This is exactly how my dock is now wired. Where they have a "Downstream Loadcenter" is the loadcenter on the dock. They show it bonded to the enclosure and to an enclosure around a load - the frame of the dock.

Just to be sure I've conveyed this right: When the N was connected to the dock frame, shock occured, power on or power off. A ground wire was added - it connects directly to the ground rod. The N is NOT now connected to the frame. The G is connected to the frame. Shock occurs with the G connected to the frame power on or power off. The G & N are connected (bonded in the vernacular) - in this case at the meter where the service enters the house. After that they do not touch. In the main breaker box of the house, they are at the same potential (0v on a meter) and 0 ohms resistance when measured with a meter. Check out these diagrams - they are not my work (this upload stuff is cool).

Did a quickie of a picture (10 minutes). George does this fit with your understanding? Shock occurs if G is connected, power on or power off It does not occur if G is disconnected, power on or power off.

Just to be clear: the neutral is NOT tied to the frame, the ground wire is tied to the frame (which is exactly what most electricians will tell you to do). You still get shocked if the power is turned off. The shock is not associated with the AC power. It is associated with 2 points on the earth ground being at a different potential. That's why this is an interesting problem - you do stuff like you are supposed to do and it produces a shock. Set it up against code (electrically float the dock by isolating it from from the neutral and the phase) and there is no shock - though it will likely be be unsafe if there is a problem.

John: Got a link to this NEC article?

Something like this will be my next step. I'm going ot go back to basics and make sure the connections are good. After that, I'm going to explore better grounding at the top of the hill - maybe several ground rods. I've been considering talking to the utility co, but that may open a kettle of fish that I don't want to open.

You're exactly right - there is a discharge from the lake into the dock (or the other way around). That discharge is because the wire connected to the ground rod up the hill and the lake are at different potentials. If you disconnect the wire from the ground rod ("ground" wire and neutral) then the doc can reach steady state and, since the dock is floating electrically, it will reach the same charge as the lake, and there will be no shock. The problem with having the dock float (not grounded) is that it will be dangerous if a hot wire touches it. The frame of the dock will be at 110v wrt the lake. A swimmer touching the ladder/dock will be the primary discharge path, and ZAP. This is a well known and well documented problem around marinas (and one of the reasons you're not supposed to swim around them). Big aluminium hulled boat has some snafu with wiring - hot lead touches the aluminium, and doesn't trip a breaker cause the hull isn't grounded. Hull sits at 110. Swimmer gets close to that and goes into cardiac arrest. Death is ruled a drowning!