The CT sensors included with your Vue monitor can be extended or shortened to reach circuits anywhere in your panel. This article covers specifications, wiring polarity, and step-by-step instructions for both the Vue 3 and Vue 2.
Vue Gen 3 — Specifications
Wire gauge: CT sensors use 22AWG wire
Recommended extension wire: 22AWG with 600V rating
Maximum extension length: 30 feet for optimal accuracy
Conduit or shielding: Not required, even when running near live wires
Critical Wiring Guideline — Polarity
When re-terminating sensor wires into the green terminal block on the Vue 3, polarity must be correct:
Black wire (positive) → terminal marked with a solid/filled-in circle (●)
White wire (negative) → terminal marked with an empty circle (○)
Reversing polarity will cause the circuit to display as negative or generation. Double-check this before securing the terminal block.
Vue Gen 3 — Extending a CT Wire
Un-terminate the sensor wires from the green terminal block.
Connect your extension wires to the sensor wires using wire nuts — black to black, white to white.
Re-terminate the far end of the extension wires into the terminal block, matching polarity: black to the solid circle (●) terminal, white to the empty circle (○) terminal.
Ensure all wire nut connections and terminal block connections are tight and secure.
Plug the terminal block back into the Vue 3 port.
Video walkthrough:
Vue Gen 3 — Shortening a CT Wire
Un-terminate the sensor wires from the green terminal block.
Clip the sensor wire to the desired length.
Strip approximately ¼ inch of insulation from the wire tips.
Twist the stranded copper strands together firmly on each wire to prevent fraying.
Re-terminate the wires into the terminal block, matching polarity: black to the solid circle (●) terminal, white to the empty circle (○) terminal.
Confirm all connections are secure, then plug the terminal block back into the Vue 3 port.
Video walkthrough:
Vue Gen 2 — Extending CT Sensors
The Vue 2 uses standard audio jack connectors rather than terminal blocks. CT sensors can be extended using off-the-shelf audio extension cables — no special tools or soldering required.
200A CT sensors — use a 3.5mm mono or stereo audio extension cable
50A CT sensors — use a 2.5mm audio extension cable
Keep extensions under 20 feet where possible. Signal strength can degrade over longer distances and cause measurement inaccuracy. If you need to monitor circuits more than 20 feet from the gateway, a second Vue 2 device installed closer to those circuits is the recommended solution.
Feedback and Suggestions
This knowledge base is continuously updated to provide the most helpful guidance for Emporia customers. If you found this article unclear or have suggestions for improvement, please contact our Customer Support team.