Rectifier and Bond Reading
Tim Jenkins
Basic Electric - Shunts
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
Slide Resister
Application
Resister Wire Application
The amount of Resistance is
made by the Length of the
Wire.
Disconnect Bond Wire for
1.36
Amp
Current
Drain
Amp Drain
Reading
Make
Connection
in series
with the
Circuit
Slide
Resister
Lighting
Connection Made on
Resister from Foreign
Structure and
Columbia.
Disconnection to get Amp
Drain must be made in serie
with the circuit.
Direct Bond
Connection, No
Resistance
Shunt Resister
Measuring
Amp Drain by
Measuring
Voltage Drop
Across the
Shunt. Ratio is
normally
found on
Shunt.
.001V = 1A
7 milivolts = 7
Amps
Make
connection
across Shunt.
Polarity does
not matter.
Ratio for Shunt
Shunts do not have to be
disconnected in BI-monthly an
Alternative method
– use shunt for amp
readings.
Take mili-volt
reading across
shunt then use
ratio to figure
total amps.
Connect meter in serious for
amp reading
on the structure or anode wire.