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djt22
09-25-2009, 03:25 PM
How would you run 275watts of lights that would total out to about 90 foot of wire if put on one run? Contractor is using a Kichler 15PL600 watt Transformer with 10 gauge wire.

Pro-Scapes
09-25-2009, 03:49 PM
Easy. Run a 2nd 10ga. You could have up to 4.5 v of drop and would be over 300w with the wire resistance

You are limited to 300w per secondary. The max allowed on 10ga wire is 288w and your pushing that too far. Im not saying its impossible... I am saying it probably wouldnt be safe and that transformer does not have the guts to hold the voltage and not something I would do or reccomend.

Dont forget this doesnt even begin to cover proper voltage distribution.

djt22
09-26-2009, 12:18 PM
Bill thanks for the response its a debate amongst peers. Contractor called wanting to know if he could put it all one one I didn't like the idea another guy did Length Run x Watts / 10ga constant and said well move it over to compensate the voltage drop.

Pro-Scapes
09-27-2009, 11:15 PM
Sounds to me like you need a new contractor. Your statements are not making much sense either ?

Move what over ?

djt22
09-28-2009, 03:45 PM
"Move IT OVER" that model kichler transformer has 12-15 volt taps so he would move it over to the 13 volt tap to compensate for the voltage drop.

Terradek
09-29-2009, 10:06 AM
288w on a 12v tap is going to produce 24amps. Each 300w circuit is maxed out at 25amps. By NEC code you should be using only 80% of a branch circuit so that would limit you to 20amps max per 300watt circuit. If you "move over" to the 13v tap you will make things worse. Because now you will have and "Effective Wattage" of 312w or 26 amps. This will exceed the circuit capacity and will be a code violation not to mention a safety risk.

Just use more wire and split the run...sometimes saving a nickle on wire will cost you big time when things go wrong.

Pro-Scapes
09-29-2009, 07:50 PM
Perfect reply Gerry. Good to see you on here again.

I think just about any lighting contractor worth the air he breathes will be in agreement on this.

sprinkler guy
09-30-2009, 01:18 AM
If there was ever a job that sounded like it should use LED lamps, this sounds like the one.

JoeyD
09-30-2009, 01:27 PM
Or a 24v Transformer and 24v lamps!!!!