Blue Sea Systems 1408 M-Series Dual Circuit Plus, Main + 3 Position CLB Vertical - Manual (Page 10)

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DC SHUNT FOR ANALOG AMMETERS
Install shunt for analog DC current measurement:
An external shunt is supplied with 360 panels that include a DC analog
ammeter. Install the shunt at any point in the DC positive or negative, prefer-
ably in the most direct high current path (do not reroute the direct current
path to accommodated shunt placement). Mount shunt close to the panel
to keep the sense wires that run from the shunt to the meter short. Short
sense wires minimize voltage loss and result in the most accurate metering.
Mounting the shunt close to the battery bank may make it easier to include
more circuits, such as 24-hour circuits, in the metering. Wire runs up to 50
feet using #16 AWG wire may produce errors up to 1%. Use 16 AWG wire
for sense connections up to 50 feet in length; use higher gauge wire for
longer wire runs. There should be a 1 Ampere fuse in both sense wires near
the shunt terminals.
Notes:
1. Where a long run is required between meter and shunt, minimize
interference by twisting the sense wires together.
2. If the shunt is installed in the negative feed line, no fuses are required.