Depends how thick the wire is and how big a volt-drop you can stand. For a 300' run you will be looking at a fairly heavy cable to keep volt-drop to reasonable limits. Post a bit more detail of your load and what supply variation it can handle and someone will probably give you a cable size.
Basically it will be supplying two 24VDC siren/strobe lights for audio/visual status of a process. Each strobe is .56 amps. I would tend to think it could stand a drop of a couple volts. If anyone could give me a rough idea of wire size that would be great. Thanks
16 ga. wire has a resistance of 4 Ohms per 1000 feet. You have 600 ft. so the resistance is 4 x 0.6 = 2.4 Ohms. The voltage drop would be V = IR = 0.5 x 2.4 = 1.2 Volts
It might be a good idea to put a 1,000 to 4,700uF at the end of that run since the type of loads you have are pulsing. Momentary current can be considerably higher than the average and this may cause problems.
Just yesterday I was playing with a GPS I had pucked up for $5 bucks with a battery case problem. My bench power supply had a 5 ohm resistor to jumper to the center connector so I could use a standard banana pair. The GPS draws less than .06A, but I couldn't get it to turn on till I shorted the 5 ohm resistor!
