Allowable ampacity for 10-2 copper NM-B is 30 A.
http://www.cerrowire.com/default.aspx?id=46
The ampacity of an 8-3 non-metallic sheathed (NMB) cable typically varies depending on factors such as the insulation type and installation conditions. Generally, for residential wiring, an 8-gauge wire can handle approximately 40 to 55 amps, according to the National Electrical Code (NEC) guidelines. However, it's essential to consult local codes and consider factors like ambient temperature and bundling of cables, which can affect the actual ampacity.
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Capacity for cable 70mm (143-212 amp) and may vary depending on installation method used.
NMB wire is a type of electrical cable commonly used in residential wiring. It consists of two or more insulated wires bundled together with a bare copper ground wire. NMB wire is designed for use in dry locations and is often used for powering outlets, switches, and lighting fixtures in homes.
Most local codes require that when extending or adding circuits, the circuit must be brought up to national code standards. This would necessitate that if you have a 2 wire circuit and are adding to it, that you rewire the entire circuit to 3 wires. However, in actual practice, it is common to see 3 wire nmb connected to 2 wire nmb without full re-wiring. It is important to note that when this happens, the ground wire in the 3 wire cable serves no purpose. You end up with what looks like a 3 wire grounding configuration at a receptacle or other outlet when in actuality you have no equipment ground. This allows a hazard to exist that no longer conforms to current code, and if someone were to be injured you may be held liable.
Allowable ampacity for 10-2 copper NM-B is 30 A.http://www.cerrowire.com/default.aspx?id=46
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The web address of the Nmb Area Museum Foundation is: nmbmuseum.com
The rule of thumb is 1mm square=6Amp so 10mm square will,for safety reasons and for a copper conductor, carry 50Amps.
The ampacity of 8 AWG copper wire is typically around 40 to 55 amps, depending on factors such as insulation type, installation conditions, and ambient temperature. For aluminum wire of the same gauge, the ampacity is lower, approximately 30 to 40 amps. Always consult the National Electrical Code (NEC) or local regulations for specific applications and conditions.