Planning Low Voltage Layouts to Minimize Voltage Drop

These diagrams show some of the most common low voltage cable/conductor layouts. Your choice of layout can help minimize voltage drop.

1. Straight run installation Fixtures run in sequence directly from the transformer.

2. Split run installation Split the load using the recommended maximum cable/conductor length in two or more directions from the transformer. This method is also for use with multi-tap transformers.

3. "T" Installation This methods allows for the equal distribution of power to the center of a run, or to a run some distance away. The cable/conductor running from the transformer should be of a heavier gauge (10 gauge).

Warning: Loop installation(Not recommended by Sea Gull Lighting!) This method is thought to help reduce voltage drop and produces a more uniform light output. It is important that you connect the same wire leads to the proper transformer terminals by noting the ridge or marking on one side of the cable!!! Safety is our greatest concern. Therefore, we do not recommend this method of reducing voltage drop.

Other Thoughts to Minimize Voltage Drop

The closer your lamps are placed to the transformer, the higher their voltage (and wattage) readings will be. Those farthest away will have lower voltages. If a cable/conductor run is too long, or if too many fixtures are being powered by a single transformer, noticeable voltage drop may occur. Voltage drop causes the lights farthest from the transformer to become dim. Voltage drop can be minimized in several different ways including those suggested in the illustrations above:

• Use a multi-tap transformer (12-13-14-15)
• Use multiple transformers
• Shorten cable/conductor lengths (use multiple runs from the transformer)
• Reduce individual fixture wattages
• Reduce the total number of fixtures on a run
• Convert the installation to 24 volts or 24 volt multi-tap.

Voltage drop can actually work to your advantage if differences in lamp brightness levels are not objectionable. Lower voltage will extend the life of a lamp, requiring less frequent replacement.

Note: To ensure the full 25 amp capability of any of the Ambiance® Lighting Systems and not to disturb its integrity, the jumper wire from the transformer to where the system begins MUST be 10 gauge wire. In other words, if the 10/2 stranded, 105° cable is used, the jumper wire must be of the same gauge e.g., 10 gauge romex or equivalent.