+1Voltage drop for feeders and branch circuits combined should be no more than 5% per energy code requirements (note the voltage drop section is in the commercial energy code only). This encompasses the entire length of the circuit, from the service all the way to the end device. Putting a sub-panel doesn't "reset" your required voltage drop. The voltage drop that is occurring between your meter main and your sub-panel also needs to be taken into account.
No. Voltage drop is point to point and putting a subpanel in the middle of the feeder would not change the voltage drop in the conductors.If I’ve got a long run from meter main to the location where I need power and I’m trying to save money on copper. Can’t I just break that run up with a sub panel? It’s a 250’ run and I need 60A. Voltage drop calc gives me #4 copper. So can I use smaller wire by installing a sub panel in the middle and if then why is that?
If I’ve got a long run from meter main to the location where I need power and I’m trying to save money on copper. Can’t I just break that run up with a sub panel? It’s a 250’ run and I need 60A. Voltage drop calc gives me #4 copper. So can I use smaller wire by installing a sub panel in the middle and if then why is that?
I have a question. I have a 20 amp circuit running 430’ long and feeding 9 - 40watt 120v lights along the way until it hots the last light at 430’. What size wire should I use?Voltage drop for feeders and branch circuits combined should be no more than 5% per energy code requirements (note the voltage drop section is in the commercial energy code only). This encompasses the entire length of the circuit, from the service all the way to the end device. Putting a sub-panel doesn't "reset" your required voltage drop. The voltage drop that is occurring between your meter main and your sub-panel also needs to be taken into account.
Here is the formula for single phase VD = 2*K*I*L/CM K = 12.9 for copper I = amps L =one way lengthI have a question. I have a 20 amp circuit running 430’ long and feeding 9 - 40watt 120v lights along the way until it hots the last light at 430’. What size wire should I use?