maybe you can mount torroidal current transformers around the current carrying wire
and connect the outputs thereof to the board with a simple connector - maybe a 25 pin D=Shell?
a twisted shielded pair from each torroid.
these Pearson current transformers may have a built in resistor and hence have a voltage output
there are mounting holes:
Current Monitoring Transformers
www.pearsonelectronics.com
look at number 5101
Current Monitoring Transformers
www.pearsonelectronics.com
look at number 1025
no barrier strips, no exposed currents, no weird routing of current carrying wires
easily detached, even with power on, as the voltages entering the board are small, and no current
cable from current transformer to board some sort of coax, so some noise immunity