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100 amp 208 volt wire size4/9/2024 THWN-2 – can be used for wet or dry locations In addition to THHN, some other common insulations used with #3 copper wire for 100A breakers include: For code compliance, calculate the conduit fill percentages and adjust conduit sizes as needed. Typically, a 1″ conduit can fit three #3 THHN wires for a 100A 240V circuit. Running #3 AWG THHN wires through conduit needs to consider conduit fill requirements. A larger size helps compensate for heat buildup in the buried cable. For aluminum, increase to #1/0 AWG underground. For copper wire, the recommended size is #3 AWG based on the 75☌ ampacity. Underground wiring to a 100A breaker should use the proper underground rated wire like USE-2 or UF. Oversize aluminum to #1/0 AWG for better performance. Common insulated aluminum conductors would be #1 XHHW-2 or #1 RHH/RHW-2 for wet locations. This requires #1 AWG aluminum wire to match the capacity of #3 copper. The code allows aluminum wires for 100A breakers following the NEC one size rule. Optional larger sizes like #2 or #1 AWG can be used for less voltage drop. This gauge handles 100A for installations including wiring in: Copper Wire Sizesįor a 100A breaker, the NEC recommends #3 AWG copper wire. This allows it to be safely run through conduit. THHN wire size for 100 amps would be the standard #3 AWG copper softened with THHN insulation. This high heat-resistant thermoplastic wiring stands up to the elevated temperatures that can occur in a 100A circuit. THHN Wire for 100 Amp BreakersĪ common wire insulation type used with 100 amp breakers is THHN wire. Oversizing beyond the code minimum is unnecessary and increases expense. Smaller wires may overheat, melt or cause voltage drops. This wire gauge is sized to safely handle the 100A current and prevent overload conditions from occurring. Send me a PM to where in NC you are located and if yor are within an hours drive of Asheboro I will be glad to come help you with your problem for free.The National Electrical Code (NEC) minimum wiring size for a 100 amp breaker is #3 AWG copper or #1 AWG aluminum. An appliance can be either a three wire (meaning no neutral) or a four wire (meaning a neutral is required) 208 or 240 volt appliance.Ĭlick on jwelectric on the left side of the page and the click on private message. The requirement of a neutral will not mandate the voltage requirement of an appliance. To operate a 240 appliance on 208 and the appliance will not last very long. To operate a 208 appliance on 240 volts the appliance will not last very long. If you have one appliance that requires 208 volts and another that requires 240 volts then the cart will require two different feeds to supply these appliances. These are two complete and different voltages and will not be mixed in the same panel.Įach appliance will have a nameplate that designates the voltage, amps, and frequency of that appliance. There is one voltage of 208/120 wye (pronounced “Y”) which will have a center tap neutral point and another voltage of 240/120 delta which will have the center of one winding tapped for the neutral point. If all the appliances are wired into one 100 amp panel on the cart then there will be only one voltage of either 208 or 240 but it will not be both. I learn a lot from the back and forth on these forums and appreciate it. Is it true that a 100 Amp receptacle will need #2 Wire? Is this going to be a nightmare for the museum to get that size wire pulled through the existing conduit back to the main panel?Īny discussion would be appreciated. I've seen 100 Amp cord caps and receptacles, but I'm curious as to what kind of wiring is going to have to be pulled for the receptacle!? Currently there are two single gang boxes at the location, but they have at the most, 10 gauge solid copper wire in there. The cart needs to plug into a receptacle in order to receive power. The cart has a couple other miscellaneous pieces of equipment and they all lead back to a 100 Amp panel in the cart. A 220, 30 Amp espresso machine, and a 120/208, 30 Amp Coffee Brewer. We're installing a couple pieces of equipment on a mobile cart in a museum. First off, I have no intention of doing a lick of this work myself! I'm just involved with a project and I'm curious about how this is going to get done.
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