Double pole breakers are rated for 240 volts, providing greater protection against short circuits, arc faults, and overloads. When wiring a 125-amp system, select a 125-amp double pole circuit breaker for a main disconnect. No matter what type of 125 amp wire size you choose, consult a certified electrician for help with the installation and use the size specified by the NEC table for your circuit. It costs less money than 1-gauge copper, is lightweight, and has excellent flexibility making it cost-effective for longer distances. Copper is the best option and provides superior conductivity, meaning it can efficiently handle higher electrical current demands.Ģ/0 aluminum is another popular wire size for 125 amp sub panel. Both have their own advantages, depending on your individual needs.ġ-gauge copper is the most common type of wire used in residential and commercial circuits for up to 125 amps. When determining the 125 amp sub-panel wire size, there are two types of 125 amp wire sizes: 1-gauge copper and 2/0 aluminum. The 200 amp wire size you need will increase the longer the distance run to account for voltage drop. Note on Wire Sizes: A #2/0 AWG copper or #4/0 AWG aluminum wire size is also used for 200 amps. With their expertise, you can rest assured that your electrical system is up-to-code and safe! Please consult a licensed electrician for more detailed information on the 125 amp wire size and breaker. With the proper installation, you won’t have to worry about arcing or short circuits, which can be a major safety hazard. So pay a consulting fee or buy a case of beer or a jug of hooch for a licensed local electrician to line out your project for you.By following these guidelines, you’ll have peace of mind that your 125 amp wire size and breaker are up to code and can handle all of your electrical needs. You want to pass your inspection first time around but without spending more money and time than you have to. You need good advice before making electrical mods. My friends here in PM wish you well and would never knowingly mislead you but few of us (including me) are electrical professionals. While this is presented in tables, an informed judgement is still required. OTH a 100 Amp service is defined by the breaker and the conductors it feeds have to meet code requirements for Ampacity, conduit fill, insulation, placement in construction, max ambient air temp, and other factors. In electrical practice the overcurret protection is intened to protect the conductors it feeds not the power consuming equipment. #4 may be technically adequate for your immediate application for a 100 Amp service for equipment that's seldom run to capacity but when feeding a pump or a heater for example #4 may not be suitable. Look up accaptable ampacity in the NEC and your local code for your application. They're satisfactory in most situatations but not always suited to every application. Remember NEC and local code represents minimum standards. Then consider conductor size and conduit size. Some jurisdictions require upgrading of the branch circuit or sometimes even the whole system if any parts is sub-code. Maybe not in Wisconsin but certaily in warm climates. Some jurisdictions have more stringent requirements for conductor ampacity and other electrical minutia.
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