what wire do i use for a 100 amp sub panel

Wire size plays a critical role in the power and safety of any electrical system, but it’s especially important when installing a 100-amp subpanel. Subpanels are used to provide dedicated circuits for particular areas of your home or to distribute power to an additional structure such as a shed or garage. But, if the wrong wire size is selected for the job, you risk an overloaded circuit and malfunctioning equipment, as well as the potential for injury.

When installing a 100-amp subpanel, 6-gauge copper wire is the typical recommendation. This heavy-duty wire is designed to handle significant current flow without overheating. The thicker the wire, the better it is at withstanding the high demands placed on it by the transformer and other components of the electrical system. Make sure to also use a copper ground wire that’s the same size as the hot conductors for maximum efficiency and safety.

In addition to using the right size wire, be sure to install the gauge of wire properly. Safety becomes an issue if wires are run through walls or ceilings, since high temperatures can accumulate in these areas, creating a fire hazard. For this reason, wire in these locations should be run in conduit for extra protection in case of an overload or short circuit. Be aware that you may need special permits or approvals to install a subpanel, so check your local codes to avoid fines or other penalties.

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