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Rectifier and Bond Reading
Tim Jenkins
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Basic Electric - Shunts
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Basic Electric - Shunt Formulas
• Calculate Current– Given - Shunt ( .01 ohms & voltage across the shunt = 50 Mv)
– Convert units of voltage, 50mv = .05v
– Calculate current using Ohm’s law• I = .05 v/.01 ohms = 5 amps
– Given - Shunt ( 15 amps, 50mV)• Measured voltage drop = 28mV
– Determine shunt rating• Rating = 15 amps/50mV = .3 amps / mV
– Calculate current• Current = .3 amps / mV x 28 mV = 8.4 amps
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Slide Resister Application
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Resister Wire Application
The amount of Resistance is made by the Length of the Wire.
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Disconnect Bond Wire for Amp Drain Reading
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Amp Drain Reading
Make Connection in series with the Circuit
1.36 Amp Current Drain
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Slide Resister
Lighting Arrestor
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Connection Made on Resister from Foreign Structure and Columbia.
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Disconnection to get Amp Drain must be made in series with the circuit.
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Direct Bond Connection, No Resistance
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Shunt Resister
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Measuring Amp Drain by Measuring Voltage Drop Across the Shunt. Ratio is normally found on Shunt. .001V = 1A
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7 milivolts = 7 Amps
Polarity does not matter.
Make connection across Shunt.
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Ratio for Shunt
Shunts do not have to be disconnected in BI-monthly and Annual inspection.
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Connect meter in serious for amp reading
on the structure or anode wire.
Alternative method – use shunt for amp readings.
Take mili-volt reading across shunt then use ratio to figure total amps.