Quote Originally Posted by Toolmaker51 View Post
Most are grounded cords; this will have me add GFCI's to cover everything low volt. .
AFAIK: For transformers/ SELV low voltage drive units a GFCI won't be as beneficial as it will be in a full mains voltage circuit.
A GFCI works by contionously checking for current leakage to anything else than the neutral conductor
( i. e. Opens breaker if Phase and Neutral current differs more than a predetermined value: usually<20-30 mA),
and would thus only protect a transformer's primary mains circuit - not the Galvanically separated secondary's eventual fault.

As voltages below 60 V are considered "harmless" for humans & animals this is no real drawback.
Remember that though low voltage might be "safe" - a 12 V 50 W halogen lamp draws over 4 amps each -
so keep the low voltage cables short and coarse enough to minimize the fire hazard...

I've actually burned myself at work finding 6 x 50 W halogen lamps in parallel with a "few metres" of molten AWG #18 ...
The student in question was terribly offeded when I called him a "PhD Candidate in Arson".

Better knowledgeable and safe than a stupid stiff.

Cheers
Johan