Conduit is sized by the number of conductors that are being pulled into it. The conduit size of 1/2" will allow one #4 wire to be pulled into it. 3/4" will allow 2 and 1" will allow 4 #4 conductors to be pulled into it.
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A 4 AWG wire diameter is about 0.2043 inches. For this wire size, a pipe with a diameter of at least 0.5 inches (1/2 inch) would be suitable to provide ample space for the wire to pass through without being compressed or damaged.
AWG # 6 copper or AWG # 4 aluminum
4 AWG is larger than 6 AWG because the lower the number, the larger the wire size. In this case, 4 AWG has a larger diameter and can carry more current than 6 AWG.
The wire used to ground a water pipe typically needs to be a minimum of 10 AWG copper wire. It's always best to consult with local building codes or a licensed electrician to ensure that the proper size wire is used for grounding.
A 90 amp 220 volt circuit would typically require a wire size of at least 4 AWG (American Wire Gauge) for copper conductors or 2 AWG for aluminum conductors to safely handle the current without overheating. It is important to consult with a qualified electrician to ensure proper wiring size and installation according to local electrical codes.
For a 200 amp service, you would typically need a service cable with a minimum size of 2/0 AWG copper or 4/0 AWG aluminum to safely handle the current. It's important to check local building codes and consult with a licensed electrician to ensure compliance and safety.