![]() ![]() You’ll need to use 4 AWG wire if the distance between the breaker. Electricians use these wires when there’s significant space between the circuit breaker panel and electrical equipment (such as air conditioners), which is common in large commercial buildings. One essential thing with this job, no matter who does it, is that all lugs will need to be tightened to the torque specified on the corresponding labels using an inch-pound torque-wrench this is required by 2017 NEC 110.14(D), and is a good idea anyway, lest your electrical system go the way of Greg Biffle's infamous lugnuts. Most 100-amp service panels require 2 AWG wire. This limitation is a consequence of NEC 110.14(C)(1), by the way. ![]() For motors, it is recommended to multiply the nameplate FLA by 1.25 for wire sizing. In short, the wire size for a 60 amp sub-panel 150 feet away is 3 AWG gauge wire. This wire size can handle up to 100 amps. (Edited) newbie44 said: 2 aluminum can be used for residential service conductors if your calculated load is 95 amps or less.Amperes - Enter the maximum current in amps that will flow through the circuit. Some factors like the choice of wire (copper, aluminum, iron, steel, etc.) and the number of wires may influence the exact percentage loss, but this is the general rule of thumb. Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. I would use 1AWG Al wires here spending the extra for copper is a waste, and you can't get away with 2AWG for this because you'd exceed the 75☌ termination limit that is normal for breakers and loadcenters if you did. Calculate Reset Voltage - Enter the voltage at the source of the circuit. Instead, I would run a conduit between the two panels (2" EMT will handle anything you want to do here), and then simply run 3 XHHW-2 conductors (hot, hot, neutral) in the conduit between the two panels, using the conduit as a grounding path. Outdoor circuits, however, are often quite long and the voltage drop can be significant.With surface mounted panels in what presumably is an unfinished space, there is 0 reason to run an exposed SER cable here. Voltage drop occurs in any wire run, but it is rarely a problem with indoor wiring, where the distance from the circuit breaker panel to the end of the circuit is usually relatively short. However, if the cable run is long, as underground runs often are, you may need to increase the wire size to account for voltage drop-a loss of voltage in the circuit caused by the natural resistance in the wires. 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. Sizing the wires, or conductors, for an underground cable is no different than sizing for other household circuits and is typically based on the total load, or electrical demand, of the devices on the circuit. The wire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 Volts, 60C through 90C (140F through 194F), not more than three current-carrying conductors in raceway, cable, or earth (directly buried), based on ambient air temperature of 30C (86F). Such an installation is typical when running a circuit to an outdoor location, such as a garage, shed or other outbuilding, or to a yard light or water feature. Wire Size Chart Service Rating, Copper Conductors, Aluminum 100 Amps, 4 AWG Copper, 2 AWG 125 Amps, 2 AWG Copper, 1/0 AWG 150 Amps, 1 AWG Copper, 2/0. Copper Wire 1. ![]() Underground wire for a residential circuit usually is installed with underground feeder (UF) cable, which is rated for outdoor use and direct burial. Looking for the right size wire for your 100 amp sub-panel for a detached building, garage, or shed Below are the best selling wires our customers use for service to a 100 amp sub-panel - all available by the foot at our store. The Spruce Home Improvement Review Board. ![]()
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