Connect the power cable to the Panasonic Whisper Choice Auto sensor exhaust fan by routing the building cable into the fan junction box and making secure wire connections inside the knockout opening.

First, turn off power at the breaker and verify no voltage with a tester. Remove the fan grille and loosen the junction box cover on the fan; the knockout is usually on the side or top. Install an NM cable connector into that knockout so the sheathing seats against the connector lip, then feed your power cable through until you have enough conductors inside to work with. Strip about three quarters of an inch of insulation from each conductor, and trim any frayed strands so you have clean wire ends. Use three-conductor wire where required for the sensor function, matching the fan leads to hot, neutral, and ground by color or the fan wiring diagram. Twist conductors together only when required, then secure each splice with a properly sized Wago style push-in connector or equivalent rated for the conductor size and number of wires. Fold the connected wires neatly into the junction box so nothing is pinched, replace the junction box cover, restore power, and test the fan and sensor operation.

Common mistakes include not shutting off and verifying power first which risks shock; always lock out and test before touching conductors. Another frequent issue is using the wrong connector size or not seating the NM cable connector in the knockout which allows the sheathing to pull back and expose bare conductors; use the correct connector and tighten any compression or locknut until the cable cannot be pulled out. A third problem is mismatched or loose splices that produce intermittent operation or heat; use rated push-in or lever connectors designed for the wire gauge, confirm firm engagement, and trim excess conductor length so splices sit flat in the box.

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