4/12/2024 0 Comments 480v 100 amp wire size![]() Last edited by Matt Marsh 10-02-2014 at 3:37 PM. The calculator I used gave me 3 AWG copper wire in 1 inch rigid but on our. If you run a #6 bare copper GEC, you can run it exposed on the surface unless it is subject to severe physical damage (250.64(B). What's new I am trying to size wire and conduit for a new 480 Volt 3 phase 100 amp service. Although the minimum size grounding electrode conductor is typically #8 copper for a 100 amp service (it's actually determined by feeder size, not amperage), the NEC requires that conductors smaller than #6 be physically protected (usually conduit). It is almost always easier and more cost effective to satisfy the NEC requirement by supplementing one ground rod with an additional one (250.53(a)(2). ![]() The measurement must be performed with a dedicated ground resistance meter, something that very few contractors have. ![]() The only way that you can get by with a single one, is if you can prove by measurement that the ground resistance is 25 ohms or less. A 3-phase 100 amp connection implies a total of 100 amps per phase, with a combined capacity of 300 amps. If you are using rod type electrodes, you really need to drive two of them, at a minimum of 6' apart. The only exception is if the separate building is fed with just a single branch circuit (2014 NEC 250.32a). Plugs have a notch that must line up with a keyway in sockets and receptacles when mating. They have a nonconductive nylon housing so they’re safer to use than components made of metal. You just check the NEC feeder sizing table and see that, for 200 amp service, you will need either a 2/0 AWG copper wire or 4/0 aluminum wire. Jason, A separate building always requires a grounding electrode system in addition to the equipment grounding conductor that you mention. For a 100-amp service, the neutral wire should typically be sized to match the hot conductors, which are often 1/0 or larger depending on local codes. These connectors meet international standards IEC 6, so they’re compatible with other IEC 60309 devices.
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