Always start your calculations with 12-gauge wire.
Landscape lighting wire size calculator. What this means is that the calculator returns a wire gauge that is capable of handling 10 more wattage than what was entered. Total watts will be 40 path lights40 spot lights80 watts. 10000 or less.
Most transformers will usually fit into the 150W 900W capacity range. A lower number means thicker wire and greater capacity to carry the power current for longer distances. Matching the landscape lighting design to the size of the transformer is essential for efficient function and operation of the entire system.
For a more in-depth review of your space please. Create a plan for your landscape lighting installation by sketching out the area and marking the desired location and style spot path washer etc of each light fixture. The smaller the number the bigger the wire.
Refer to the chart below to find the right wire gauge. This convenient calculator allows you to customize the different aspects of the system such as wire gauge and run lengths between fixtures. This method is great for placing fixtures in hard-to-reach areas.
Now that you know what landscape lighting wire you need and you have your design in hand you can start your dream yard project. Divide the total wattage computed on the previous step by 12 to get the total amps or current. Third use the new values to calculate the cable size for the remaining lights.
We recommend 12-gauge or 10-gauge wire for long distances Example of calculations. Were as a 120 volt line voltage wire is a single strand wire. Wattage x Footage x 0011 Voltage Drop.

