Good choice and you are welcome. With Low Voltage Systems Voltage drop requirements exceed minimum Current capacity requirements. What I cannot answer is if you needed 6, 12, or 1/0 AWG because you only gave 1 data point of 3 needed. You only gave 1-way distance of 20 feet. To determine wire size I would need to know voltage and current. There is no technical or safety issue in using a larger conductor than needed. Only harm or pain is in the wallet. However it does add additional requirements on Ground Conductors if the system is grounded. If you increase the size of the supply conductors requires you to increase the size of ground conductors which causes more pain in the wallet.
Morro of the story is be careful with over sizing. You want to limit losses to 2-3%. If Codes dictate 12 AWG minimum, but voltage drop calcs determine 10 AWG is required, going to 6 AWG is not gaining you anything meaningful and doubles the cost needlessly. I not only care about your safety and proper operation, I also care about your wallet and keeping the green in it.
Morro of the story is be careful with over sizing. You want to limit losses to 2-3%. If Codes dictate 12 AWG minimum, but voltage drop calcs determine 10 AWG is required, going to 6 AWG is not gaining you anything meaningful and doubles the cost needlessly. I not only care about your safety and proper operation, I also care about your wallet and keeping the green in it.
Comment