| Date post: | 10-Apr-2018 |
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951 Fairview Avenue
Bowling Green KY 42101(270) 842-6541
www.wrecc.com
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THE FARMELECTRICAL SYSTEM
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UTILITY SYSTEM(S)
Generation
Transmission
Distribution
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UTILITY TRANSMISSION
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UTIL ITY DISTRIBUTION
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THE FARM
ELECTRICALCONSTRUCTION
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REGULATIONS
(OR LAWS)
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REGULATORY LAW
SPEED LIMITS
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MORAL LAW
MOSES OR MOM
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ONE OF KIRCHHOFFS LAWS
A Summary: Current (electrons) will allreturn to their source through all
conductive paths available.
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NATURAL LAW
GOD CREATED
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NATURAL ELECTRICITY
Lightning
Mans Electrical System
Cows Electrical System
(All Independent)
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IMPORTANT POINTSTO REVIEW TODAY
Grounding vs. Grounded
Circuit Conductors
Bonding Jumpers, Straps, Screws Equipotential Plane
Voltage
Current
Resistance
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The EARTH is
w here w e ground our
e lec t r ic a l sys t em sgrounded neutral
at the ground rod
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GROUNDING
(GROUNDING CONDUCTOR)
Bare or
Green
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SUPPLY CIRCUIT CONDUCTOR
(THE HOT WIRE)
Black
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SOME IMPORTANT POINTS:
Usually copper or aluminum
All conductors have a resistance to
current flow The diameter determines the limit of
current flow
They must have insulation to keep thecurrent on (or in) the conductor
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BONDING
(INTENTIONAL CONNECTION)
Jumpers
Straps
Screws
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EQUIPOTENTIAL PLANE
OR EQUIPOTENTIAL GRID(CONCRETE REINFORCING STEEL)
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SOME IMPORTANT POINTS
Does nothing by itself
Has potential to do work
Potential difference appears between
two points Is always there
A pressure or force:
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CURRENT
(Amps) (Electron Flow)
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RESISTANCE(CALLED IMPEDANCE IN AC CIRCUITS)
(Measured in Ohms) (Opposes Current Flow)
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SOME IMPORTANT POINTS
Aluminum wire has more resistancethan a copper wire
Smaller diameter wires have moreresistance than larger diameter wires
Longer wires have more resistance
than shorter wires AC (resistance) impedance is more
difficult to determine
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SINGLE PHASEELECTRIC CIRCUIT
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TYPICAL 120 VOLT CIRCUIT Supply
Main Panel Ground Rod
Main Bonding Jumper
Circuit Breaker
Supply Conductor
Switch
120 Volt Load
Neutral Return
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COMPLETE 120 V CIRCUIT
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MAIN PANEL
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CIRCUIT SUPPLY CONDUCTOR
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120 VOLT LOAD
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GROUNDING CONDUCTOR
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REVIEW
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951 Fairview Avenue
Bowling Green KY 42101(270) 842-6541
www.wrecc.com
