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It’s almost been a year since Carmen Johnson, 15, of Hartselle, Alabama drowned off the boat dock of her family lake home after being electrocuted.
Just last week, two more women, Shelly Darling, 34, and Elizabeth Whipple, 41, are suspected to have died as the result of electric shock drowning in Lake Tuscaloosa, also in Alabama.
In the case of Johnson’s death, the current that shocked her was caused by water seeping into a light switch box on the boat dock, according to her mother. When a metal ladder was lowered into the water for Carmen and her friend to climb out the two girls were electrocuted.
These deaths highlight a little-known but growing danger that comes with swimming near docks and the boats secured to them. Since Johnson’s death, her parents have worked to educate and warn the public about electric shock drowning.
“We don’t want anyone else to go through what we’ve experienced,” Carmen’s mom Casey Johnson told AL.com. “We could just not talk about it. But, we know Carmen would want us to talk about this and save another life.”
What is an Electric Shock Drowning (ESD)?
ESD happens when a swimmer comes into contact with electrical current. The current ‘ in this case, alternating current (AC) ‘ causes skeletal muscular paralysis, lasting for only an instant, but long enough to incapacitate a swimmer.
Where does the electricity come from?
The electric current “leaks” from boats and docks into the water. It can come from frayed wires, improperly wired systems or an AC grounding system that is damaged or malfunctioning.
What causes people to be electrocuted?
Electrical current will always attempt to return to its source in order to complete the electrical circuit. Electrical current is resourceful and will find any way to do that, taking the path of least resistance and most conductivity (anything that will help the current move along its path). The way alternating current (AC) searches for its source is the most deadly for humans because it takes only a small amount of AC to disrupt the electrical impulses that control our muscles and nerves.
Read more: Laundry pods pose hidden danger to kids
Why does ESD happen in fresh water and not salt water?
We go back to conductivity for the answer. Fresh water is not a good electrical conductor. Because it is not a good conductor, the alternating current looks for something better. A human body in fresh water becomes that something better. The high amount of salt in humans make our bodies far better conductors of electrical current than fresh water.
How much electricity is needed for this to happen?
Not much at all. It takes only small amounts of leaking AC to incapacitate or electrocute a person. As small an amount as 15 milliamps can cause paralysis, 100 milliamps ‘ or a third of the amount of electricity need to light a 40-watt light bulb ‘ can kill a person in seconds. For comparison, a double AA battery produces 2400 milliamps per hour.
Doesn’t anyone regulate docks and boats secured to them?
There are marine codes that regulate docks and boats. They are NFPA 303 (Fire Protection Standard for Marinas and Boatyards), NFPA 70, and National Electric Code 555 (NEC). Boatus.com also notes that “boats not wired in accordance with standards set forth by the American Boat & Yacht Council (ABYC) can be a source of AC leakage.”
Can you tell if water is unsafe to swim in?
No, but here are some tips that could keep you safe.
If you feel ”˜tingly’ in the water, you could be at risk for shock. In that case, you should:
(Information courtesy of boatus.com.)
This post was last modified on April 20, 2017 3:31 pm
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