- Install CTs on the phase conductor that corresponds to the meter’s voltage input phase.
- Install CTs with the arrow(P1>P2) or label ‘This side toward source’ facing towards the breaker feeding the load.
- Connect the white(S1) and black(S2) CT leads to the corresponding CT input terminals with the white(S) and black(S2)dots.
CT Lead Wires
If the CT lead wire is longer than necessary, you can shorten it.
Short CT lead wires help minimize interference from electrical noise.
If the CT lead wire needs to be longer than 8 feet, you can extend it.
In general, it's better to install a sub-meter near the conductor you want to measure instead of extending the CT wire.
Metal conduit acts as a shield, but if you're using PVC, we recommend shielded twisted pair.
If the distance is short, you can connect the power conductor for the meter's voltage input to the same conduit.
However, over longer distances, you should avoid connecting the power conductor to the same conduit as the CT extension to minimize power line noise interfering with the sensitive CT signal.