![]() What Im having a hard time determining is if the ground wire to the sub panel. I have read that one should strive for a voltage drop of less than 3 and from what I can tell this means I need 2 cu or 1/0 al for the two hot and neutral. Shall be permitted to be smaller than the ungroundedĬonductors, provided the requirements of 215.2, 220. I would like to install a 120/240 volt 100 amp sub panel on a detached garage that is about 200 ft away. Not be required to have an allowable ampacity rating greater The feeder conductors to a dwelling unit shall The panelboard that supplies, either by branch circuits or byįeeders, or both, all loads that are part or associated with the dwelling unit. For application of this section, the main powerįeeder shall be the feeder between the main disconnect and I am Using 12/2 to go to all outlets from subpanel. Ten gauge wire is also a common size and can handle the. I will need 5 poles (spaces) in subpanel, and the total amps used from all items will be 39/22. Web it varies for several reasons, but you generally need 1 awg copper wire for a 100 amp sub panel. Raceway or cable with or without an equipment groundingĬonductor. I have a double pole 40 amp breaker that is available (or I can change it). 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 It is a good idea to mark the position of the breaker before doing anything. You will want to run your conduit from the garage to the main breaker located in your house. Source If you want to use aluminum, you need at least 2 gauge or perhaps 1. You can use 1-1/4 PVC conduit if you are running a 100-amp sub-panel if you have a 50-amp sub-panel, go with 1 PVC conduit. For individual dwelling units of one-family, You need a 3-3-3-5 copper SER cable to carry 100 amps (that's three 3 gauge for the two hot wires and the neutral and a 5 gauge for the ground). 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. 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). I am trying to up load a picture but nothing happens Sub panel is right beside main wire is run through conduit
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