I had a complete Volt lighting system installed by our landscape installer at our new house earlier this year. The installation includes 8 - G4 Infiniti 60 LED floodlights; 10 - China Hat Shade path lights with G4 LED bi-pin bulbs; 600 Watt transformer, model VTR-600-NG-SS. There are three lighting runs (length/wire ga/watts per run): (a) 124' - 12 ga. wire, 60 watts (b) 111' - 12 ga. wire, 40 watts (c) 120' - 12 ga wire, 48 watts. Based on this, I believe the 600 Watt LV transformer has more than ample capacity to power the installation. Since the installation was complete in March, the main breaker the feeds the GFCI plug for with the LV transformer trips frequently. The breaker trips only when the system turns on based on the time clock setting. After resetting, the system would operated properly for 4 - 8 days and then trip again. For the first round of troubleshooting, the landscape installer had the LV transformer replaced under warranty: it was humming. After replacing the LV transformer, the problem continued and the installer felt it was no longer a landscape lighting issue causing the breaker to trip. The electrician that wired the house was called in to troubleshoot the problem as well. In their last effort, they left the GFCI outlet on a separate home run back to the main panel: no other outlets or devices were plugged into that circuit. The problem continued. In an effort to try an isolate the problem, I plugged the LV transformer into a heavy duty extension cord and plugged that into a different circuit. The problem stopped. The electrician is at a loss on next steps to take with the outside GFCI outlet. I'm wondering if anyone here has had a similar experience or can offer other ideas on troubleshooting: I do not want to operate the system via an extension cord running from my garage to the transformer. Thanks in advance for your thoughts!