![]() ![]() Wire properties such as cross-sectional area, ampacity and resistance are also listed. If you refer to Table 11 of the same manual. On the other hand, a 3/4 hp pump with the same motor type and voltage needs a 20 amp breaker. It corresponds to 5.067×10 -4 mm².ġ000 CM (circular mils) = 1 MCM or 1 kcmil = 0.5067 mm², so 2 kcmil. A wire gauge chart lists the American Wire Gauge (AWG) sizes for electrical cables and converts them to inches and millimeters. Based on Table 14 in the Franklin manual and since you’re likely asking about the breaker size for the 230v well pump, you’ll need to use a 30 amp circuit breaker for it, not considering the distance. Where Ī circular mil (CM) is a unit of circular area with a diameter of one mil (one thousandth of an inch). If the wire size is greater than all gauges (i.e 0000 is largest one size of wire in), then electrical engineer measure it in CM, kCM or MCM instead of inches, because inch is a small unit of these kinds of wires. Select and Enter values:ġ10 V 120 V 208 V 220 V 230 V 240 V 277 V 440 V 480 V 600 V The rule of thumb that techs will usually go by is that for a 30 amp circuit breaker, 10-gauge wire is the right one to go with. ![]() For source voltages of more than 50 V, if L<16 m, this calculator assumes a distance of 16 m so that the wire doesnt result in excessively tiny sizes for small lengths. Also check the “ Good to know” Section right after the calculatorĮnter value, And click on calculate. This 24V wire size calculator has the three-phase system option enabled, but, for most applications, 24 V systems will work in DC or AC single-phase.This is a wire that can handle up to 20A and the heater only draws a maximum of 18.8A. Note: the Value of ρ = Specific resistance or resistivity of Conductor is used here for copper and aluminum is 12.9 and 21.2 respectively at 75☌ (167☏). Essentially, you can see that most water heaters use 4500 watt heater and require 14 AWG copper gauge wire. ρ = Specific resistance or resistivity of Conductor. ![]()
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