Electrocution

[ishoot308]

Originally Posted by Rich

But I wouldn't suggest one of these alarms after reading the background information on them. I agree that they can give a false sense of security. They could fail.

But other's think they are good enough for their lives and the lives of their family.

So let me make sure I got this straight Rich....your saying I am better off not getting one of these Safety devices because of the false sense of security?? One of these safety alarms could fail and someone could get electrocuted? So my choices if I care about my family are...

A: Don’t allow anyone to swim at my island home ever.

B: Don’t do anything

Hmmmm....I think I’ll go my route and take my chances. After all a safety device that works 50% of the time is better than nothing....

Dan

[Rich]

Originally Posted by ishoot308

So let me make sure I got this straight Rich....your saying I am better off not getting one of these Safety devices because of the false sense of security?? One of these safety alarms could fail and someone could get electrocuted? So my choices if I care about my family are...

A: Don’t allow anyone to swim at my island home ever.

B: Don’t do anything

Hmmmm....I think I’ll go my route and take my chances. After all a safety device that works 50% of the time is better than nothing....

Dan

Be educated and smart about it.

If it was your private dock and no other boats are involved, then you can be more sure of the condition of your boat than at a Marina where there is less control and more boats.

Perhaps a safer thing to do would be to switch off the shore power to the dock while people are swimming, or get the alarm and I hope all your equipment is in good order, also be sure the alarm is functioning as well as your GFCI is functioning.

But either way, please understand the issues at hand (read those links). A failure can happen when you least expect it.

[Formula260SS]

So I have a question

How far will current travel in water? Example - my neighbor two doors down has shore power for his boat, if he has a problem will the current reach my swimming area about 400' - 500' away? I would guess the resistance of the water would have a lot to do with how far it will travel.

[ishoot308]

Originally Posted by Formula260SS

So I have a question

How far will current travel in water? Example - my neighbor two doors down has shore power for his boat, if he has a problem will the current reach my swimming area about 400' - 500' away? I would guess the resistance of the water would have a lot to do with how far it will travel.

That is almost impossible to answer as there are too many variables. Google it for the hell of it and you will see what I mean. I do know that the it travels farther in salt water, I also know that the cleaner (less minerals) the water the less it will travel.

Dan

[Formula260SS]

Originally Posted by ishoot308

That is almost impossible to answer as there are too many variables. Google it for the hell of it and you will see what I mean. I do know that the it travels farther in salt water, I also know that the cleaner (less minerals) the water the farther it will travel.

Dan

Yes it would travel further in Salt water as it's more conductive. The cleaner the water the less conductive / more resistive it is.

Maybe I'll measure the conductivity of the lake this weekend and try to answer my own question. I'm a water guy and know a few things on that end but I'm not an electrical engineer

[FlyingScot]

Originally Posted by Formula260SS

Yes it would travel further in Salt water as it's more conductive. The cleaner the water the less conductive / more resistive it is.

Maybe I'll measure the conductivity of the lake this weekend and try to answer my own question. I'm a water guy and know a few things on that end but I'm not an electrical engineer

Please keep us posted. I agree with Dan--this is really important and google is no help. Even knowing ball numbers--10', 100', 1000' would be great

[Formula260SS]

Originally Posted by FlyingScot

Please keep us posted. I agree with Dan--this is really important and google is no help. Even knowing ball numbers--10', 100', 1000' would be great

So as I continue to wonder - what about all the power cables that run from the mainland to the islands? Yes of course they meet codes but think about a failure there......

I know we hear about Marina's having issues every year but has there been a story of a pump in a lake doing the same thing? Also, most homes in NH have well pumps. If I'm thinking about this correctly the pump is always submersed in the well, the water in the well runs into the house, there is no stop gap between the pump in the well and the water coming out of the faucet. Keep in mind the pump casing is in the ground and the copper piping may be tied to an earth ground as well.

I know my well pump at home is not on a GFI but is grounded through my panel but what if the pump shorts and the breaker does not pop?

Kind of thinking out loud here - I have sources for answers I will reach out to but the subject is interesting to me and if there are any electrical engineers out there that can add some thoughts I'd appreciate it.

[Sue Doe-Nym]

My thanks to all who have brought this tragic and deadly topic to our attention. Truth be told, it’s not something I have thought about seriously, and now I am going to do research on it. With 3 teenagers in the family who all love water activities, it’s imperative that they are aware of the dangers with electricity/docks/marinas and swimming where it’s risky. Again, thanks for the heads up!

[ishoot308]

Originally Posted by Sue Doe-Nym

My thanks to all who have brought this tragic and deadly topic to our attention. Truth be told, it’s not something I have thought about seriously, and now I am going to do research on it. With 3 teenagers in the family who all love water activities, it’s imperative that they are aware of the dangers with electricity/docks/marinas and swimming where it’s risky. Again, thanks for the heads up!

You made my day!

Thank You!

Dan

[fatlazyless]

For about $21.25 isn't the Klein ncvt-2, non-contact voltage tester, a small easy-to-use tool for testing aluminum docks, or aluminum boat lifts without getting into the water? By holding it to up to the aluminum dock or aluminum boat lift or outboard/inboard motor, it should indicate if there is any voltage present by both making a loud beep and a red light.

...... the Klein ncvt-2 made by Klein Tools, quality electrician tools ....... $21.25 ....... sold at Lowe's, Home Depot, some hardware stores,
Amazon, Ebay

Would like to get some comments on this.

[LIforrelaxin]

So here is the thing.... it is simple as much as reasonable possible keep electricity away from the water...... While there may be an allure to having docks or a power outlet on your dock, why do you believe you need it. Can you solve the problem another way?

In a Marina setting, where boats need shore power because people live on them etc. It has to be a concern and I get that.

But should your average citizen have a need to have power down at their dock? I don't think so.... But yet I know many do it. I don't even pull an extension cord down on my dock to charge a battery if I know people are going to be swimming.

None of this is rocket science... be smart....

If your concerned about it, an alarm like ishoot308 posted seems like a reasonable investment, and helps with piece of mind, to make sure there is no consistent threat. What can't be prevented however is when an electrical line becomes suddenly exposed, and all hell breaks loose until what ever breaker of fuse it is connected to blows.... There is simply nothing you can do, to be 100% safe... Giving yourself a piece of mind is what you need to look at.

[Formula260SS]

Originally Posted by LIforrelaxin

So here is the thing.... it is simple as much as reasonable possible keep electricity away from the water...... While there may be an allure to having docks or a power outlet on your dock, why do you believe you need it. Can you solve the problem another way?

In a Marina setting, where boats need shore power because people live on them etc. It has to be a concern and I get that.

But should your average citizen have a need to have power down at their dock? I don't think so.... But yet I know many do it. I don't even pull an extension cord down on my dock to charge a battery if I know people are going to be swimming.

None of this is rocket science... be smart....

If your concerned about it, an alarm like ishoot308 posted seems like a reasonable investment, and helps with piece of mind, to make sure there is no consistent threat. What can't be prevented however is when an electrical line becomes suddenly exposed, and all hell breaks loose until what ever breaker of fuse it is connected to blows.... There is simply nothing you can do, to be 100% safe... Giving yourself a piece of mind is what you need to look at.

I did receive some feedback on the issue of electricity in and around the lake. Although I'm very interested in passing the information along I don't feel comfortable putting it out here on the forum due to that nature of the subject.

I'm going to say what the others have - be safe and practice sound judgement. Consult a licensed electrician if you have any concerns around your waterfront and electricity at all.

[fatlazyless]

Some boat lifts run on 110-volts with a ground fault interrupter on shore, installed by the home owner, and with all the wakes and waves action happening is possible for a short circuit or an open hot. A gfi that is not grounded correct will probably not interrupt as designed.

[FlyingScot]

Originally Posted by fatlazyless

Some boat lifts run on 110-volts with a ground fault interrupter on shore, installed by the home owner, and with all the wakes and waves action happening is possible for a short circuit or an open hot. A gfi that is not grounded correct will probably not interrupt as designed.

We had a GFI that stopped interrupting. No damage done; we stumbled on the issue and fixed it. But still...

[ishoot308]

Originally Posted by FlyingScot

We had a GFI that stopped interrupting. No damage done; we stumbled on the issue and fixed it. But still...

If the GFI stops working shouldn’t the breaker in the panel kick off as a secondary Line of safety?

Just curious...

Dan

[jbolty]

If a gfci breaker or outlet is not wired correctly it will almost never allow it self to set.

They do go bad and usually fail open but that's why there is a test button we all ignore.

The normal breakers do nothing other than trip if the current flow exceeds the rating; they are there to protect the wires. They do not trip based on anything with the grounding unless it's a dead short or close to it.

[Rich]

From what I understand (and I could be wrong), the difference with salt vs fresh water is that the salt water can conduct the current easier, so it could go to ground sooner.

With fresh water, it creates a voltage gradient that is stronger at the source, and dissipates as you are further from the source. So if you are swimming away from a dock. you feel a tingling, and as you start heading back towards the dock and apparent safety, you are actually swimming towards the problem, then your muscles get locked up and you can't swim, nor call for help. Some of the reference materiel suggests that many apparent drownings near marinas, docks, etc. may have been caused by undetected intermittent electrical issues.

I'll have to search those links I included for descriptions of all of this, but this is from my memory of researching it a year or two ago, but for some reason I seem to recall that from a number in the order of hundred(s) of feet away from the electrical current source and you could be away from a danger zone in fresh water. I'm not sure if the number is 100, 200, or 500. Before anyone uses this information, I'd suggest that you do your own research. I'm sure the distance varies greatly, depending on the conductivity of the water, the amount of AC current or leakage into the water, voltage involved, and probably several other unknown factors.

Here's the background on the 'green light' or 'safe to swim' warning devices:

https://www.electricshockdrowning.or...t-devices.html

Monitoring devices used as a “green light” to indicate it is safe to swim around electrified docks will put a lot of people at great risk. Staying out of these potentially dangerous waters for recreation is the only way to eliminate the risk. If used solely to alert an owner that there are electrical safety problems on the dock, then the ESDPA fully supports their use. But NEVER as a “green light” for swimming or other in-water activity.

Personally, I think a private dock is a much different story than a shared dock with multiple boats.

If anyone comes up with more information, such as a report that states a safe distance in fresh water, I'd like to know the source please. For example, I'm told that a popular lake marina doesn't allow swimming from their docks. but has a nearby beach or designated area where swimming is allowed.

This link says no recreational swimming within 150 feet of a dock with shore power:

https://www.electricshockdrowning.or...tober_2019.pdf

Here's another presentation on ESD that is easier to read as it's all slides and bullet points, and has minimum 'fine print'. It also states 150 ft as a minimum distance from a shore power dock:

http://electricshockdrowningmn.com/D...08-16-2018.pdf