"Tim Fischer" wrote in message
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"SQLit" wrote in message
...
What is on the circuit now? 600 watts at 120v could be a problem.

A 600 watt transformer at 12v or 120v?

Watts are Watts are Watts.

A 15A circuit fully loaded is about 1800 watts. 80% loaded (which is a
good safety threshold) is 1440 watts. Doesn't matter if those watts are
at 120V or 12V, they're watts.

(it's AMPS that depend on the voltage, eg. 600W of lighting at 12V is 50A,
which would require some pretty hefty wire).

-Tim

If the OP's transformer is like mine then the secondary is split into 2
outputs. Maybe the OP has 3?
My Malibu transformer is sold as 500W unit which is referring to the 12V
output. The label on my transformer says INPUT: 3.5A max @ 120VAC which
would calculate to be 420 Watts.
The OUTPUT is labeled: 500W total @ 12V, BUT it is really two 250W outputs
or about 20.8A each output.
If the OP has 3 equal outputs of 200 Watts each then that would be 16.6 amps
each which would be reasonable for the 12ga low voltage wire they sell.
Kevin