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Hiding Under Cabinet Light Drivers

By kitchen remodeling carlsbad record

The thin glowing strip under a wall cabinet gets all the attention. The part that decides whether it works for the next ten years is the small box that feeds it. Low voltage LED lighting needs a driver, sometimes called a transformer or power supply, and every strip, puck or bar in a system has to connect to one. Where that box goes, and how it can be reached later, is a planning decision that is easy to skip and expensive to fix.

What the driver actually does

Household power arrives at a high voltage and in alternating form. LED strips and many puck lights run on low voltage direct current. The driver converts one to the other and limits the current so the diodes are not damaged. Without it, nothing lights, or something lights briefly and fails. Some linear bars have the driver built into the fixture; those need only a plug or a hardwired connection, which solves the hiding problem by moving it elsewhere. Strips and pucks almost always use a separate one.

Drivers run warm, produce a faint hum if they are poorly made, and fail more often than the LEDs they feed. That last point shapes everything else: plan the location as if the box will need replacement.

Sizing before hiding

A driver is sized by its output rating, measured in watts, and by its voltage, commonly twelve or twenty-four volts for strips. Add up the load of all the strips or pucks on that driver, then choose one with extra room, because running a power supply at its limit shortens its life. Leaving generous headroom is a standard way to keep the box cool and quiet.

Longer strips lose brightness at the far end when the voltage drops along the run, which is one reason higher voltage strips are favored for long counters. A single driver can feed several short runs, but each run should be wired back to it in an organized way instead of chained end to end.

The places a driver can live

Inside the upper cabinet

A common choice is to mount the driver inside a wall cabinet, near the top, on the side or the back panel. It is close to the strip, out of sight, and shielded from steam. The cost is that the cabinet interior is used storage, and the box can be knocked by loaded shelves. Use a spot above the highest shelf or behind a small block that keeps dishes from touching it.

Above the cabinet

The space between the top of the wall cabinets and the ceiling is a favorite. It is out of reach for daily use, hidden by trim, and close to where the wire has to come from. The drawbacks are heat and dust. Kitchen air carries grease, and a box sitting on top of a cabinet collects a film over years. It also needs a way to be reached, such as a removable crown piece or a cleat that lets the top trim come off.

Inside a cabinet base or an adjacent utility space

If a long run of strip serves several cabinets, a driver in a base cabinet near an outlet may be simplest. This takes the heat off the wall cabinet and puts the box where service is easy, but it adds a long low voltage cable that has to travel up through the wall or along the cabinet back.

In the ceiling or attic

Some installers place the driver in an attic or a crawl space with a hatch. This works only when the access point is truly reachable, and it is not an option in every home. It adds distance, and low voltage runs lose power over long cables, so the extra length has to be counted.

Access is the whole point

Hiding a driver and burying it are two different things. A hidden box is out of sight but can be reached by removing a trim piece, opening a panel or lifting a cleat. A buried box is sealed behind drywall or glued cabinetry, and it will eventually require destroying something to replace it. Building codes in many places require that electrical devices stay accessible, and even where they do not, a failed driver behind a closed wall is a bad outcome.

Practical ways to keep access:

• A small removable panel in the cabinet side, held with magnets or screws.
• A lift-off piece of crown or light rail above the cabinet.
• A labeled switch or plug near the box that shows where the power comes from.
• A service loop of extra low voltage wire, so the box can be pulled out and set on a counter for testing.

Plugs, hardwiring and switches

Many drivers come with a plug, which is convenient and keeps the box separable. A plug-in driver needs an outlet nearby, often one tucked inside the cabinet or above it, and the cord needs to be secured. A hardwired driver is connected to the house wiring through a junction box, which gives a cleaner result and removes any visible cord. Hardwired connections should be done by a licensed electrician where local rules require it, and the junction box needs to remain reachable.

Control matters too. A switch can sit on the line side of the driver, which turns off the whole box, or on the low voltage side, which can be less reliable. A dimmer must be compatible with the driver; many LED systems pair a specific dimmer with a specific driver, and mixing brands can create flicker. Choosing a dimmable driver and testing it before the cabinets are closed up saves frustration.

Heat, ventilation and moisture

A driver needs a little air around it. Wrapping it in insulation, stacking boxes against it or stuffing it in a closed cavity shortens its life. Leave a small gap, and avoid putting it directly above a cooktop or a steaming appliance. In a kitchen near the coast, damp air can reach a box inside a cabinet, so a driver with a sealed case or a damp location marking is a smart pick if the spot is not fully dry.

Noise is the other consideration. A faint hum from a driver is usually a sign of a poor match with the dimmer or an overloaded unit. Mounting the box on a hard surface can amplify the sound; a small foam pad or a rubber mount cuts it down.

Wire routing and neat finishing

The low voltage wire from the driver to the strip should be secured with clips along the cabinet bottom or the back edge, not left hanging. Running it through a drilled hole in the cabinet frame, with a grommet to protect the insulation, gives a clean path. Where wire has to cross open space, a small channel or a light rail hides it. Plan the path before the cabinets are installed, because drilling through finished boxes later is awkward and easy to get wrong.

Label each driver with the strip it feeds and the date it went in. A small tag inside the cabinet, written in pen, is useful when someone later tries to figure out which of several boxes controls which counter.

A short planning checklist

1. Add up the total load of every strip or puck on the driver and pick one with spare capacity.
2. Choose the location for ease of service first and concealment second.
3. Confirm the driver and the dimmer are listed as compatible.
4. Leave a service loop of wire at the box.
5. Test the whole system with the cabinets still open.
6. Label the box and note where the access panel is.

A driver is the least glamorous piece of an under-cabinet lighting system, and it is the piece most likely to be needed again. Putting it somewhere that stays hidden from guests and reachable for repairs is what keeps the lights quietly working for years.