125 Amp Wire Gauge

Using load current and length we compute the wire gauge that meets the chosen voltage drop.

125 amp wire gauge. In is the circuit breaker rating in amps i2 the current at which the cb opens. A wire with a rating of 125 amps. The electrical panel in a home provides the main interface between electrical circuitry and the power company s lead ins. A 1 copper wire with an insulation factor of 75 or 90 degrees c is rated at 130 and 140 amps respectively.

Since this is a single phase dwelling service you can use 2 awg copper or 1 0 aluminum for a 125 amp service or main feeder. Safety features include a main disconnect that trips if the power load exceeds its rating. The higher the gauge number the smaller the. Ci correction factor for thermal insulation.

Find the volt drop of the system v1 v2 divided by the load gives zs. A 600 mcm copper conductor will limit the voltage drop to 3 or less when supplying 125 amps for 700 feet on a 240 volt system. A 125 amp panel is large enough for a small home with a few large appliances. See the table here.

Electrical current is measured in amps. Common us awg wire gauges and amps ratings. You need to use the 75 column since no one makes a 90 breaker just yet. The number of devices connected to the circuit usually determines how much current will flow through the wire.

The wire size chart below shows allowable. It is important to pick the correct size of wire so that the wire doesn t overheat. 125 x 80 100 amps. One method to determine the potential short circuit current if you do not have a loop impedance tester.

Above and keep the wire with the largest gauge. Load current fuse size 1 25 it is generally accepted that a fuse must be at minimum 125 the size of the load current. We find a wire gauge for which the ampacity is higher than the fuse size. Cg correction factor for grouping.

With an insulation factor of 60 degrees c a 1 0 wire is rated at 125 amps. Each wire size or wire gauge awg has a maximum current limit that a wire can handle before damage occurs. How to wire a 125 amp service step 1 firstly ensure that the power is completely off for safety reasons by disconnecting the power leads from the meter. 1 current ratings for up to 1000 v pvc insulated single and multicore wiring cables ambient temperature up to 30 o c values for resistance are based on electrical resistivity for copper 1 724 x 10 8 ω m 0 0174 μω m and electrical resistivity for aluminum 2 65 x 10 8 ω m 0 0265 μω m.