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100 amp breaker code#

#2 AWG has 115A ampacity but should conduct at most 92 amps.

#3 AWG has 100A ampacity but should conduct at most 80 amps.

#4 AWG has 85A ampacity but should conduct at most 68 amps.

For our wires, this is what the actual ampacity is: You never put the circuit under 100% ampacity at most you wire it to hit 80% ampacity. Maximum loading for any branch circuit is 80% of the rating of the circuit for ampacity of wire for any load.

100 amp breaker code#

Here is what NEC code says about 100 amp sub panel wire sizes: To understand why this is, and what wire size you need for 100 amp sub panels 100 or 150 feet away, let’s look at the what the NEC code requirements are for 100 amp wire size: 100 Amp Wire Breaker Size With 80% NEC RequirementĪs you can see from the chart above, these are the wire ampacities in the vicinity of 100 amps: In fact, the most appropriate wire size for 100 amp service is the #1 AWG wire with a 130 amp median capacity.

Now, it seems that a #3 AWG wire with 100 ampacity is the perfect 100 amp wire size. From that chart, you can see that we have 4 wire sizes with amps in the vicinity of 100 amps. You have all the AWG copper wires and their ampacities listed (at median 75☌ or 167☌ temperature). Here is how you adequately size a wire for 100 amp service:įirst, check the wire gauge chart here. We will use both of these factors when determining what size wire you need for 100 amp service.

Distance from the sub panel due to the voltage drop (NEC 310-16 Code).

80% National Electric Code (NEC) requirement (NEC 220-2 Code).To avoid frying your circuit, it’s vital to account for two key factors that come into play here: Many homeowners use smaller #4 AWG and #2 AWG wires for 100 amp service and wonder why they fried their sub panel. What size wire for 100 amp service 100 feet or 150 feet away?.With 100 amps sub panel wire size, we get a number of different questions, such as: These wires range from the biggest 0000 AWG wire with 230 ampacity to the smallest 40 AWG with less than 0.1 ampacity. In the US, we have an AWG gauge system for wire sizes. 100 amp circuit at 240V can handle up to 24,000W of electricity. Looking for wire size for 100 amp service? If you are trying to set up a 100 amp conduit circuit, you will need to make sure to choose the right wire size.