![]() ![]() Yes, and you don't even need another 200A breaker. Is feeding a 200A sub from a 200A main legit? Main Load Center is a Homeline HOMC30UC.Is 4/0-4/0-4/0-2/0 Aluminum SE-R sufficient? I've seen answers for similar scenarios suggesting 250 kcmil, but I don't know why.Can the 200-amp main feed the 200-amp subpanel and stay up to code? An electrician told me it can't.It's about 20' as a straight shot, but 40' if I go up into the attic and back down, because the main panel is on the opposite side of the garage as the basement wall. Install 200-amp main breaker load center in the basement.It's not ideal to have all the breakers in the master bedroom, we plan to replace the older wiring over time, and I'd love to upgrade to a plug-on neutral load center, so I'd like to install a new load center in the basement as a subpanel. We anticipate a number of projects on this house over the next couple of years, including converting the garage to a master suite. The 200-amp main panel is in the garage, on the same wall as the meter. It looks like it was upgraded at some point to 200-amp service, with a new load center, but most of the old 2-conductor (no ground) wiring remains. Michael J.I just bought an older house. As always, consult the local authority having jurisdiction for any local electrical code rules that may be necessary in addition to the minimum requirements of the NEC. I hope this helps with you questions concerning sizing equipment grounding conductors for feeders. The answer is based on NEC-2008, Sections 250.122, Table 250.122, and Chapter 9, Table 8 (conductor properties). The minimum size equipment grounding conductor for this 200-ampere feeder is a 4 AWG copper conductor. Required equipment grounding conductor = 6 AWG copper (Table 250.122 based on 200 ampere overcurrent protection for the feeder)Īccording to Table 8, a 4 AWG copper is required = 41,740 cm The size of the ungrounded circuit conductors has been increased 149% therefore, the equipment grounding conductors must be increased 149% as well, per 250.122(B). This is done as follows using Table 8, chapter 9 of the NEC:Īdjusted size phase conductor ÷ Required phase conductor size = 250,000 ÷ 167,800 = 1.49 Now if the feeder ungrounded conductors have been increased in size from 3/0 copper to 250 kcmil copper (for example) for voltage drop reasons, then the required equipment grounding conductor must also be increased in size proportionately. The minimum size equipment grounding conductor required for a 200-ampere feeder is not less than 6 AWG copper (see 250.122 and Table 250. What is the minimum size equipment grounding conductor required for a feeder (400 feet in length) supplying a panelboard for charging equipment?įor a 200-ampere feeder, a 3/0 copper conductor is generally required by the minimum requirements of the NEC. I will answer the question without the voltage-drop calculation information since this information is missing.įirst, the question is restructured as follows: Note: if a voltage-drop calculation is performed for this 400-ft feeder, then the system voltage and phase configuration of the feeder are necessary for the voltage-drop calculation. The next bit of information needed is the size of the ungrounded phase conductors intended to be installed for this feeder. I presume you are referring to the size of the equipment grounding conductor with the feeder and not a bonding wire which is undefined by the NEC. ![]() The first item to clarify is the terminology. I will answer the question by inserting the minimum necessary information. The question appears to deal with a voltage-drop situation, but information is missing. For a 200-amp load center used for feeding charging equipment that is approximately 400 ft from main switchboard, what size of bonding wire is required? - T. ![]()
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