If you need to calculate actual voltage drop, you might want to consider using our voltage drop calculator for both wire circuits and circuit boards, AC and DC. We allow a maximum voltage drop of about 3% before the wire specification increases. Since we have tried to consider safety as our primary factor, any marginal decision factors are toward the safe side. Only thing I can think of other than a mistake is it is a service with multiple service disconnects which would allow the wire to be sized to the load (in that case it shouldnt really be called an 800 amp service but if it was a panelboard with an 800 amp bus one might call it an 800). 50-70 Amps: When dealing with ampacity requirements between 50 and 70 amps, an 8-gauge wire is the recommended choice. We can’t use a 15A breaker because the breaker ampacity should be at least 15.63A. This is based on NEC NFPA 70E Table 250.122. To calculate the size of the circuit breaker needed, we have to multiply the amp draw by 1.25 factor like this: Minimum Circuit Breaker Size 12.5A × 1.25 15.63 Amps. This wire size can handle currents of up to 50 amps, making it suitable for medium-sized loads. The Ground Conductor Size Calculator will calculate the proper ground conductor size for grounding raceways and equipment based on ampere rating or setting of automatic overcurrent protection device in circuit ahead of equipment. Our calculator yields results that are within code in most locations however we advise you to check your local electrical code. 30-50 Amps: If your ampacity requirements fall between 30 and 50 amps, a 10-gauge wire is recommended. A sample of 120 volts, single phase, copper wire, 144 feet (one half of a 288 foot circuit) with 10 amps load on it yields a number 10 awg wire size. For 125 amps, you will need a 1-gauge copper wir e size. For a 100 amp service, you will need a 1-gauge wir e size. For an 80 amp, you need a 4-gauge copper wir e size. Enter the total amperage on the circuit also enter one half of the total length of the circuit. The rule of thumb that techs will usually go by is that for a 70 amp circuit breaker, 4-gauge copper wire is the right size to go with. Select the type conductor wire material, the circuit voltage and the phase of the circuit. You can check what size wire you need for 100 amps here. The purpose of the calculator is to determine the size of the conductor wire in a circuit of a given distance with a given amperage load. This calculator requires the use of Javascript enabled and capable browsers.
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