![]() ![]() Permits can still be obtained by homeowners in several regions. To complete the professional installation, you’ll need a permit. When constructing a 200 amp electricity line, it’s critical to use the proper gauge wire. For a 200-amp electrical service, what size wire is required? Aluminum wiring demands larger size wires than copper wiring due to its weaker conductivity than copper. The voltage drop and length of the wiring are factors in determining which wire to use. Michael J.A 200 amp service needs a wire size of either 2 AWG or kcmil Copper wiring or 4 AWG or kcmil Aluminum or Aluminum clad wiring for the cabling to be installed. 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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