![]() The size may differ based on the wire size and the number of wires to put inside the conduit. You need 1¼ inch conduit for 100 amps, 2 inches for 200 amps, 2.5 inches for 300 amps, and 3 inches for 400 amps. 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. Common electrical services include 100, 200, 300, and 400 amps. ![]() You want to pass your inspection first time around but without spending more money and time than you have to. Rating: electrode conductor for dwelling units services: 20 A. 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. Installation of 100 amp electric service or subpanel needs a 4 AWG copper wire or 2 AWG aluminum or copper-clad wire inside a minimum 1.25 inch, schedule 40 or 80 PVC electric conduit for underground service. ![]() 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. Current Logic: For a 100amp panel, it looks like this would typically require 3 AWG THWN wire (seems that SER isnt rated for use in conduit and Ive seen 3AWG (all references to wire are copper) recommended on this. The run will be about a 100 feet from a MCC bucket. The calculator I used gave me 3 AWG copper wire in 1 inch rigid but on our electrical contractors proposal he has 2 AWG copper wire in 1 1/2 conduit. Look up accaptable ampacity in the NEC and your local code for your application. Subpanel will power yard lights, bbq island, and workshop/shed (160sq ft with basic contractors table saw, drill press, etc.). I am trying to size wire and conduit for a new 480 Volt 3 phase 100 amp service. 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. The 100 amp sub panel wire size can be based on cable run and selected wiring technique. The capacity of these wire gauges is good to carry the connected load. Some jurisdictions require upgrading of the branch circuit or sometimes even the whole system if any parts is sub-code. The preferred wire size is 2 AWG copper or 1/0 AWG aluminum for a 100 amp sub-panel wire size. 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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