You must increase the wire thickness if you intend to use aluminum wire. As mentioned above, licensed electricians recommend using a wire size between 6 gauge and 4 gauge. Your choice of wire gauge should have at least 37.5 amps. The appropriate size for a 60-amp breaker is between 6 AWG and 4 AWG (American Wire Gauge). Additionally, it would be best to account for the 80 NEC rule. Shall be permitted to be smaller than the ungroundedĬonductors, provided the requirements of 215.2, 220. 240V 30 amp wire size delivers 7,200W wattage. Not be required to have an allowable ampacity rating greater The feeder conductors to a dwelling unit shall Southwire's Voltage Drop Calculator is designed for applications using AWG and KCMIL sizes only. When sizing conductors, calculations limits wire size to voltage drop and NEC ampacity. The panelboard that supplies, either by branch circuits or byįeeders, or both, all loads that are part or associated with the dwelling unit. Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. The following are the maximum lengths of cable you can use while still maintaining a 3 percent voltage drop for the given wire size (AWG) and circuit voltage. For application of this section, the main powerįeeder shall be the feeder between the main disconnect and This is a good goal to shoot for when sizing the conductors for an underground cable. Raceway or cable with or without an equipment groundingĬonductor. Main power feeder to each dwelling unit and are installed in In Table 310.15(B)(7), shall be permitted as 120/240-volt,3-wire, single-phase service-entrance conductors, service lateralĬonductors, and feeder conductors that serve as the Two-family, and multifamily dwellings, conductors, as listed For individual dwelling units of one-family, I would save a few bucks and go with aluminum for a residential feeder, code had no hard standard for voltage drop but the recommendation is 3 at the sub and 5 an the end of the branch circuit. In order for the “other” table to be used those conductors would need to be the main power feeder and they are not.ģ10.15(B)(7) 120/240-Volt, 3-Wire, Single-Phase Dwelling ServicesĪnd Feeders. Your voltage drop is almost the same for a 240v feeder at 100’ at a full load. Since 85 amps is not a standard size in 240.6 then you can go up to the next standard size which is 90 amps. OK since the conductors are in conduit then it’s likely that they can be used at the 75° C ampacity in Table 310.15(B)(16). Ensure that you take precautions while wiring circuit breakers. We have also highlighted some appliances requiring a 60-amp circuit breaker. ![]() However, the amp wire size might also depend on other factors. I am trying to up load a picture but nothing happens As we have seen, the appropriate size for 60-amp breakers is between 6 and 4 AWG (American Wire Gauge). Sub panel is right beside main wire is run through conduit
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