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##### Asked by: Melanio Smith

automotive auto parts# What size wire do you use for 200 amp service?

Last Updated: 16th May, 2020

SERVICE ENTRANCE CONDUCTORS SIZE AND RATING | ||
---|---|---|

Service or Feeder Rating | Copper Conductors | Aluminum or Copper-Clad Aluminum |

125 Amps | #2 AWG | #1/0 AWG |

150 Amps | #1 AWG | #2/0 AWG |

200 Amps | #2/0 AWG | #4/0 AWG |

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Thereof, what size wire do I need for a 225 amp service?

With 4 - 4/0s and 4 AWG (the required EGC for **225 amp** feeder) you **will** be just a touch over.

One may also ask, what size wire do you use for a 100 amp service? When it comes to the lines connecting master and secondary panels, where the line will carry as much as a full **100 amps**, **use** a 2-gauge non-metallic sheathed electrical cable. The cable must contain one or two hot **wires** depending on your needs, one neutral **wire**, and one ground **wire**. Each **wire** should be 2-gauge in **size**.

Likewise, people ask, how do you calculate wire size?

Divide the voltage running through the **cable** by your target current. If, for instance, 120 volts will act on the **cable**, and you want 30 amps to run through it: 120 / 30 = 4. This is your target resistance, measured in ohms. Multiply the **cable's length** by its material's resistivity.

Will 8 gauge wire carry 50 amps?

**8 AWG** may **carry** a maximum of 70 **Amps** in free air, or **50 Amps** as part of a 3 conductor cable. David, if that cable **is** NM (Romex) then it actually cannot **carry 50 amps**.