I hope this helps or at least sheds some light on what you are trying to do. So once again take some time and think about what you need. If you are calculating full load then the grounding conductor must take voltage drop into account and rise a full two sizes more just like the current carrying conductors or a #4 cu or #2 al. A 100A breaker would require a #8 cu or a #6 al. Your grounding conductor must be run also and it is sized to the breaker also. If there are some 240V loads then yes but we have to know how much will be permanent. I would suggest you take a good look on how much power you are going to use and think about what size feeder you are going to need.Īs far as whether you can reduce a neutral once again we have no knowledge as to what type of equipment you are using. Which is why I mentioned a 70A feeder which would also reduce your cost. Conductors a few size larger can become rather expensive. The main reason for you to consider this is the cost of material. If the answer is yes then you will be able to stay at the original size. If the answer is no I want to use the full 100A then you feeder would have to be raised 2 sizes to make up for the voltage drop to a #1 cu or 1/0 al. If you don't have that information then would it be safe to assume that you are using the 80% rule on your feeder size? Meaning you are only going to load your circuit to 80% under normal circumstances. Voltage drop is calculated using your power demand or all of the electrical equipment, lights, devices, and appliances you are planning to use at one time. Of course none of this takes voltage drop into consideration. If you install a 70A breaker then you can reduce your conductors to #4 cu or #3 al. Are you planning to protect the circuit with a 100A breaker? If the answer is yes then you need to run at least #3 Copper or a #1 Aluminum conductors. A circuit size is defined by the overcurrent protection not the of the equipment attached to it. As Daniel stated your 100 amp sub panel is actually a 50 amp panel. The 100 is merely a disconnect at that point. Other than that, it is a non issue, because the subpanel is protected by a 50 amp breaker, not a 100 amp. The feeder circuit needs to be a 4 wire circuit comprised of 2 hots, 1 neutral and 1 equipment ground.Alright here we go. The only issue you may have is if the 50 amp is not sufficient amperage for the subpanel needs. The maximum feeder circuit at the main panel needs to rated as a 125 amp double pole breaker.Ģ) For a 125 amp feeder circuit at 240 volts and a 110 foot run, you need a minimum of 1/0 AWG aluminum conductors. Hopefully, we can get this resolved quickly."ġ) 1st off, you can't feed a 125 amp sub-panel with a 150 amp feeder circuit as that will allow an overload on the 125 amp rated sub-panel. I know that can be frustrating and I can emphathize with your situation. "I’m sorry to hear you're having problems. I previously held a State of Illinois Home Inspectors License. I am also a Certified Construction Manager for residential construction. My background includes: 35 years as a Licensed Electrical Contractor (Residential, Commercial, Industrial) in Illinois, Retired AT&T Telecom Engineer, iNARTE Certified Telecommunications Master Technician, Adjunct College Electrical Instructor, Former Electrical Inspector, (2X graduate from DeVry Institute of Technology with Certificate in Telecommunications Installation & Diploma in Digital Electronics), FCC Amateur & Commercial Radio Licenses. My name is ***** ***** I will be happy to assist you with your electrical question.
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