capca june meeting 2015 ground fault protection
TRANSCRIPT
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CAPCA
June Meeting 2015
Ground Fault
Protection
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John McDevitt
Based in the Mid-Atlantic
Chesapeake Bay, Delaware River and Bay
and the New Jersey Coast.
Marine Electricity
Marine Fire Protection
CAPCA Member for many years
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Marine Industry Activities
Marine Surveyor – SAMS - AMS
Society of Accredited Marine Surveyors
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Marine Industry Activities
NFPA 302 Watercraft – Chairman
NFPA 303 Marinas and Boatyards Member – Since 2002
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Marine Industry Activities
ABYC Master Technician
Eight ABYC Marine Certifications
ABYC Instructor – Marine Electricity
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Based In Kent Narrows
New Boat Sales and Brokerage
Maryland, Virginia, the Carolinas and Florida
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Marine Industry Activities
Licensed Captain – 100 Tons since 1993
100+ trips up and down the East Coast.
Erie Canal, Great Lakes, Inland Rivers
Great Loop/Circle Route.
Inspected and Uninspected Vessels to 110’
Boat Owner for over 30 yearsPerform a wide range of activities for manufacturers, dealers
and consumers in the boating industry.
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Marine Electricity Basics:
First - There are three types of electrical systems found on boats:
AC – Alternating Current
DC – Direct Current
GC – Green (Current) Wires
Grounding and bonding.
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AC - Alternating Current
Examples of equipment that produce
AC Power
In the marina: Marina Transformer
(an expanded electrical field)
Onboard the boat: Generators
and Inverters
(a somewhat restricted electrical field)
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GC – Green Wire Current
(or Garbage Current)
Sources: Lightning, static electricity, stray AC fault current, stray DC fault current, faults from other nearby boats, etc.
Can’t be easily detected.
Should not be hot or energized…
Should not be controlled by switches or breakers…
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Basic GC Electric Components
AC Grounding (Green) Conductors
DC Grounding (Green) Conductors
when installed.
The Bonding System – connecting all metals that contact sea water.
…all are usually tied together in the boat.
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GC
Electric:
green wires
(or green
with a
yellow
stripe.)
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Important
Point:
Common
Grounding
AC, DC and
GC are all
tied
together
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Return Path to Ground
Electricity always will seek
the least resistant return to ground
at the source of power.
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The Return Path to Ground aboard a boat
If the AC or DC system is faulty, electricity will seek and usually find
another path to ground.
…a boat and it’s environment provides many opportunities for
this to happen.17
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So what is thedifference…
…betweenthis…
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…and this?
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This has Ground FaultProtection!!!
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…and this does not!!!
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…and what is the differencebetween this…
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…and this?
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…this outlet is Ground FaultCircuit Protected(GFCI).
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…and this
is not!
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Ground Fault Protection
In these examples there are
redundant ground fault devices on
the hair dryer and the outlet.
While in the marine environment
neither the boat or the pedestal is
ground fault protected.
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Definition: Circuit Breaker
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Protective AC or DC electrical device that
turns itself off (trips) to interrupt flow of
electricity, if the current exceeds a preset
limit.
Protects equipment from fire.
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Definition:Ground Fault Circuit Protection
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Protective AC device that disconnects a
circuit whenever it detects that the
electrical current is not balanced
between the energized or hot (black)
conductor and the neutral or grounded
(white) conductor.
Protects people from shock.
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Ground Fault Protection
Measured in milli-amps:
5mA, 30mA and 100mA
Also measured in milli-seconds:
100ms is the typical trip time
Can be an outlet or breaker
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NEC GFCI Requirements
1968 - Swimming pool underwater lighting
1971 - Outdoor receptacles and near swimming
pools
1975 - Bathroom receptacles and construction
sites
1978 - Garage receptacles
1981 - Spas or hot tubs
1984 - Bathrooms of hotel or motel guest rooms
1987 - Basements, receptacles near kitchen sinks,
and boathouses
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NEC GFCI Requirements Cont’d
1990 - Unfinished basements and crawl spaces
1993 - Wet bar sinks
1996 - All kitchen countertop receptacles,
unfinished accessory buildings, rooftops
2005 - Near laundry and utility room sinks,
outdoors in public spaces
2008 - All sinks (other than dwelling units), electric
water drinking fountains
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GFCI – Boats and Requirements
• GFCI - Ground Fault Circuit Interrupter
• GFCI protection is required in heads, galleys, engine rooms and on deck.
• GFCI’s frequently feed other receptacles.
• GFCI’s are not ignition protected.
• GFCI’s should be tested regularly.
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The rules for boats…
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The Rules
and
Regulations
for Boats
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Alternating Current
Creature Comforts
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AC – Alternating Current
AC current has not been around as long as DC current in boats.
First – on board battery chargers.
Then air conditioning, heat, hot water heaters, etc.
Now – TV, Bose system, computer, stove,microwave, block heaters, hair dryer, freezers, washer/dryers, etc.
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Remember
This?
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ELCI
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Meet this!
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The ABYCStandards
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ABYC E-11
11.11.1 An Equipment Leakage Circuit
Interrupter (ELCI) or Type A Residual
Current Device (RCD) shall be installed with
or in addition to the main shore power
disconnect circuit breaker(s) or at the
additional overcurrent protection as required
by E-11.10.2.8.3 whichever is closer to the
shore power connection.
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NFPA302 Pleasure and CommercialMotor Craft(up to 300Gross tons)2015
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NFPA 302 Watercraft (2015)
10.20.8.5 Ground-fault protection equipment
shall be installed in the main shore power
conductors with or in addition to the main
shore power disconnect circuit breaker(s)
aboard the vessel.
10.20.8.5.1 The device trip level shall be a
maximum of 30mA and the trip time shall be
a maximum of 100mS. The device shall be
readily accessible.
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CFRsCode of Federal Regulationsfor Pleasure Boats
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CFR Requirements
There are no CFR ground fault
requirements for uninspected pleasure
vessels and likely there never will be.
There may be CFR ground fault
requirements for uninspected commercial
towing and fishing vessels.
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Ground Fault Protection for Boats
Summary
The new ABYC and NFPA ground fault
requirements should be implemented in
all new boat builds.
If in fact the builders are installing these
devices, it will still be a number of years
before the greater percentage of boats in
the marina are ground fault protected.
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The Rules and Regulations
for Marinas
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The electrical regulations for marinas…
The NEC National Electrical Code is Law!
Contractors don’t follow the NEC rules for marinas and boatyards.
AHJ frequently signs off on the contractors non-compliant work.
Marinas don’t know or follow the NFPA 303 rules for marinas and boatyards.
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NFPA 303Marinas andBoatyards
2015 EditionComingShortly
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NEC
The
National
Electrical
Code
NFPA 70
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NEC Adoption States
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NEC
National
Electrical
Code
Includes
Article 555
Marinas and
Boatyards
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Remember
This?
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Meet this!
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2011 NEC - Marina Requirements for Ground Fault Circuit Protection
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NEC 555.3 Ground-Fault Protection. The
main over-current protective device that
feeds the marina shall have ground fault
protection not exceeding 100mA. Ground-
fault protection of each individual branch or
feeder circuit shall be permitted as a
suitable alternative.
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NFPA 303 Marinas and Boatyards
303.5.5.3 Ground fault protection shall be
installed in accordance with NFPA 70,
Article 555.3.
(Approved for the next edition which will be out
later this year.)
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The Current 555.3 Requirement
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The current NEC 555.3 requirement does
not provide a complete solution.
It creates a problem for marina owners
and their customers and invites
circumvention of the protective devices.
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Ground Fault Protection Elsewhere
Ground fault protection has been a
requirement for boats in Europe for
many years in the form of an RCD.
Ground fault protection has also been a
requirement for marina power pedestals for
years as well.
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Stray
Current
In the
Marina
Vs.
Out on
The
water
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Stray Current in the Marina
Stray AC current in the marina is a larger concern because the circuit starts in the marina’s electrical equipment.
Stray current always attempts to return to it’s own source of power.
The fault circuit will potentially include a great amount of the marina’s water.
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Generators
and ESD
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Stray AC and Fresh Water
The amount of salinity in the body is very close to the amount of salinity in salt water. Electricity does not see the difference.
Fresh water does not carry electricity as well. When a body enters fresh water the electricity is attracted to it.
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Fatalities
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Stray AC and Shock Drowning
A small amount of stray AC current in the water immobilizes the victim and
the victim drowns.
Typically the result of two faults:
An AC fault aboard the boat and…
A defective (GC) green grounding wire aboard the boat and/or the dock.
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West VirginiaMichaelCunninghamAct
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ArkansasAct 571Jesse’s Law
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KentuckyHouse Bill 356 Samantha Chipley Actis currently under consideration.
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TennesseeHouse Bill 1892 The Noah WinsteadNate Lynam Electric Shock Drowning Prevention Act.
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New state laws refer to existing
long time NFPA standards…
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Arkansas Law: “Bringing boat docks and
marinas up to National Fire Protection
Association 303 Standard for Marinas
and Boatyards and the National Electric
Code is necessary for the protection and
safety of all of those who enjoy our lakes
and rivers for recreation and to protect our
tourism and boating industry.”
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New Laws / Old NFPA Standards
Tennessee Law: “…for the purpose of
ensuring compliance with the standards
for maintenance of electrical wiring and
equipment contained in the National Fire
Protection Association (NFPA) 303,
section 5.20…”
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NFPA Research Foundation Grant
Assessment of Hazardous Voltage
Current in Marinas and Boatyards.
Awarded to the ABYC.
Power pedestal Ground Fault Protection.
Other notification and trip devices.
No swimming signage in the marina.
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Dangerous Stray Current
Marina Managers and Boat Owners
Improved and pro-active approach to
monitoring electrical current conditions
by marina management and personnel.
Boat owners should also be mindful of the
danger that deficient electrical equipment
may cause.
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Program Summary
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Captains should elevate their observation
of the AC electrical integrity on the boats
they are responsible for.
Pay close attention to the condition of
electrical equipment in a marina.
Discourage swimming in the marina.
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Thank you
I appreciate the opportunity to spend some time with you.
Please feel free to contact me anytime
if I can ever be of help to you.
John McDevitt - 610-220-5619