wma spring 2018 shoptalk - electric shock...

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03/16/2018 Ed Lethert

Electric Shock DrowningElectric Shock Drowning

Edward Edward "Ed""Ed" LethertLethert

El t i Sh k D iEl t i Sh k D iElectric Shock Drowning Electric Shock Drowning Safety SpecialistSafety Specialist

Member of the Member of the

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Electric Shock DrowningElectric Shock DrowningPrevention AssociationPrevention Association

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Electric Shock Drowning Electric Shock Drowning Prevention AssociationPrevention Association

AwarenessAwareness

EducationEducation

Miti tiMiti ti

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MitigationMitigation

Founded on July 15th 2011Founded on July 15th 2011


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James D. ShaferJames D. ShaferAcreditedAcredited Marine SurveyorMarine Surveyor

Began investigating marine leakage currents in 1999Began investigating marine leakage currents in 1999


Shock AlertShock AlertShock AlertShock Alert

InIn--Water Voltage Water Voltage

Gradient TesterGradient Tester

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Gradient TesterGradient Tester

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SHOCK ALERT

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FountainsDecorative

Pools

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Marina Marina

Ground Fault Ground Fault

Current Current

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MeasurementsMeasurements

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National Electrical CodeNational Electrical Code

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NEC UpdateNEC Update

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ABYC E-11NFPA 70 — NEC

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Marina Power

Shore Cord

NFPA 302NFPA 303

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Typical Dock Electrical Distribution

MAIN FEEDER BRANCH(Pedestal)

R


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2011 / 2014 NEC

… or … … or …MAIN FEEDER BRANCH(Pedestal)

R100 mA 100 mA 100 mA




2011 / 2014 NEC


R100 mA


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2011 / 2014 NEC


R30 mA




2017 NEC

… and …

30 mA 30 mA

… and …MAIN FEEDER BRANCH(Pedestal)

R30 mA


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2017 NEC

30 mA 30 mA

… and …MAIN FEEDER BRANCH(Pedestal)

R30 mA


Tentative Interim Agreement 1348

(TIA 1348)


R tiR tiReaction Reaction to the to the

2017 NEC2017 NEC

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2017 NEC2017 NEC

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Inspect Dock WiringInspect Dock Wiring

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Condition of Receptacles Condition of Receptacles

Circuit Breakers

Wiring and Connections

Electrical Ground Integrity

Circuit Breakers

Wiring and Connections

Electrical Ground Integrity

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g y

Line Voltage

g y

Line Voltage


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Test The BoatsTest The Boats

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AC Neutral to AC Ground Connection

AC Ground to DC Negative Bond

Leakage Current into the Water

AC Neutral to AC Ground Connection

AC Ground to DC Negative Bond

Leakage Current into the Water

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gg

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Pass/fail test of boats returning to marina following installation of new docks:Pass/fail test of boats returning to marina following installation of new docks:

86 Boats Tested

69 Boats Failed the Test(no longer than 22 minutes)

86 Boats Tested

69 Boats Failed the Test(no longer than 22 minutes)

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61 Failed Immediately

Cliff Norton, Bellingham Marine Industries, 2018

61 Failed Immediately

Cliff Norton, Bellingham Marine Industries, 2018


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The MK-5 Tester verifies:

• The AC ground is notThe AC ground is not bonded to the AC neutral

• The existence of the AC ground to DC negative bond

• The integrity of the AC

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ground path (the only practical way when GFP

is installed)


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ESD Warning SignsESD Warning Signs

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Warning Signs required stating

"WARNING - POTENTIAL SHOCK HAZARD - ELECTRICAL CURRENTS MAY BE PRESENT IN THE WATER."

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Required by

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the 2017 NEC


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ESD FliersESD Fliers

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ELECTRIC SHOCK DROWNING PREVENTION ASSOCIATION

www.electricshockdrowning.org

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Electric Shock Drowning Resource Center

www.boatus.com/seaworthy/ESD.asp

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wma spring 2018 shoptalk - electric shock...

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