Provide all the specifics -- then a circuit design is possible that requires no trenching.
Total circuit load?
Load of those last lights?
Voltages?
KVA of existing transformer?
Low Voltage Amps from xfmr to light string?
Fusing?
Conductor size/ gauge?
Insulation rating?
Depth of cover?
Opportunities for junction boxes along the load string?
Price limits?
Your experience with low voltage landscaping? (helpful)
Your experience with buck-boost xfmrs and their calculations?
E X A C T L Y what type of light fixture is at the end of the run?
Does it have an internal, multi-tap, transformer, itself?
Did you inspect its make-up for high resistance?
Last edited by Tesla; 02/20/13 07:02 PM.
