It is recommended that the distance between a sub-panel and wiring is two times the voltage drop on that circuit (NEC 310-16, Table 16).
Service wire for 100 amp panel code#
The NEC code specifies the distance between a sub-panel and the wiring. A wire with a diameter of 3 AWG can handle 100 amps. The National Electric Code (NEC) requires “Distance from the subpanel due to voltage drop (NEC 310-16 Code),” and by using the factor you will find that a 100-amp service requires a maximum of #3 AWG ground wire. Various types of wire are specified in the code, including those used in residential, commercial, and industrial settings. NEC guides electrical wiring installation, maintenance, and use. It has high resistance, which reduces loss and improves efficiency over #4 or #8 AWG wires. Thick wire provides more insulation and protection against physical damage. The wire size is large enough to prevent interference with other electrical wiring in the inspector’s facility, as well as provide physical protection from damage. Use at least #6 AWG copper conductor when using water ground for 100-amp service. It can, however, be effective in certain circumstances.
In most cases, electrical wiring is not installed in water. Compared to #4 and #8 AWG wires, it has a high resistance, which reduces loss and improves efficiency. In the inspector’s facility, the wire size is large enough to prevent interference with another electrical wiring.īecause the wire is thick, it provides more insulation and protection from physical damage. For 100 amps service, the copper ground wire should be at least #8 AWG. Copper ground:Ĭopper grounding is the most common and effective grounding method. It accomplishes this by providing an opposing current to electrolysis. UFER ground systems reduce galvanic corrosion between utility poles and electrical wiring in adjacent structures. UFER Grounds are conductors inserted into the earth between two structures, usually utility poles. The concrete should have at least 20′ of #4 Copper or 1/2″ Rebar when using a UFER ground for 100-amp service. Due to its low resistance, it can carry a sufficient amount of current. Installation and maintenance are easier with thin wire. There are four main reasons #4 AWG is used for equipment ground: It is small enough not to interfere with other electrical wiring in the inspector’s facility.
For the 100-amp service, the ground wire size should be #4 AWG. Therefore, the 60C table determines the conductor’s ampacity. Wire sizes range from 14 AWG through 1 AWG, with 100 amps or less rated for the circuit. A spark can ignite something else in the electrical system if there is any interference between the two wires. AWG #6 aluminum ground wire has a smaller diameter than AWG #8 copper wire and will not cause as much interference. You can go up to #4 AWG, but not below #6. The aluminum ground wire should be #6 AWG for 100-amp service. Aluminum grounding electrodes are metal strips embedded in concrete or masonry. Aluminum ground:Ī grounding electrode must be within 12 inches of an aluminum ground if you are using an aluminum ground. The rule of thumb is that the smaller the AWG, the more powerful the wire. You need either #8 AWG copper wire or 6# AWG aluminum wire because thinner wires can spark and break in enclosed areas, whereas higher gauge wires won’t. You need either #8 AWG copper wire or 6# AWG aluminum bare/earth ground for 100-amp service. Grounds connected to metal water pipes or distribution mains outside the building must be bare/earth ground.
Service wire for 100 amp panel install#
It is necessary to install a grounding electrode system (GES) when the circuit breaker has been reset and an arc or open flame is possible. Additionally, you must install a properly grounded outlet in addition to the ground size requirement.
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