![]() ![]() 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. You want to pass your inspection first time around but without spending more money and time than you have to. According to Table 8, a 4 AWG copper is required 41,740 cm. You need good advice before making electrical mods. Required equipment grounding conductor 6 AWG copper (Table 250.122 based on 200 ampere overcurrent protection for the feeder) Using Table 8, Chapter 9. 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. The most common wire size for 100 amp service is usually a 2 AWG wire, especially if the distance between the utility and breaker panel is more than 50 feet. Hot: 2 1/0AWG Neutral: 2 1/0AWG Ground: 3/0 1/0AWG How Many Wires Do I Need For A 125-Amp Service You will need three main service. 125-Amp Service Ground, Hot, and Neutral Wire Sizes. #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. What Size Wire Is Required For 125 Amp Service You need 1-gauge copper wire for a 125A electrical service. 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. In very dry ground, which provides more resistance than moist soil (meaning it does not accept electricity as readily), ground rods are sometimes stacked and joined with a special clamp so they can extend deeper into the earth. Remember NEC and local code represents minimum standards. As a rule, ground rods must be a minimum of eight feet long and should not be cut down. Then consider conductor size and conduit size. The best ground is an 8-foot copper rod you drive into the ground with a sledge hammer. Then having a 500 amp rated ground is pointless because the 100 amp wire will melt long before the ground will. For example, the box is 500 amps and the biggest wire is 100 amps. Some jurisdictions require upgrading of the branch circuit or sometimes even the whole system if any parts is sub-code. The amperage rating of the box does not matter at all. 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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