Measure the distance from the transformer to the very first fixture on each run. You do this to calculate the voltage loss. Use this formula:
Cable Voltage Drop = (Wire Run length x Total watts on the run/ Constant) x 2
12/2 wire cable has a constant of 7500
10/2 wire cable has a constant of 11920
8/2 wire cable has a constant of 18960
These guidelines are used for illustration purposes and manufacturer Installation & Instruction Manuals should be used for actual installation.
These multiple tap landscape lighting transformers have built in secondary circuit breakers connected to the commons (COM). Each circuit or COM can handle up to 25 Amp or roughly 300 watts each. If a circuit exceeds 25 Amps you will likely overload the circuit and trip the breaker.
To illustrate:
A) 300W transformer has one COM and can handle up to 300 watts
B) 600W transformer has two COMs and each COM can handle 300 Watt (2×300=600)
C) 900W transformer has three COMs and each COM can handle 300W (3×300 = 900)
Now:
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