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The National Electrical Code (NEC) is the American national standard for electrical wiring. See the link below for more information about the NEC.

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Q: Who regulates the calculations for wire size ampacities?
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What size wire to pull 6 amps 70 feet?

NEC 310.16 conductor ampacities NEC 240.4(D) For residential installations the smallest wire to be used is 14 AWG (15 amps rating) and for commercial installations the smallest wire to be used is 12 AWG (20 amp rating)


How to calculate the rating of the FUSE and Cable size. please tell the steps?

The calculations are worked backwards from the amps used by the load of the circuit. This will be used to select the correct size of the wire. Some stipulations are added depending of the ambient temperature, length from the supply or if the load is a motor. Fusing is then dependant on the wire size that is used.


What size service conductors do you need for a single phase 600 amp commercial panel?

The size of wire for service entrance conductors for a 400 amp 3 phase service could be 500 MCM copper. This is very large size wire and difficult to bend and shape, to connect to terminals in the main disconnect and distribution panel. This problem is solved by using parallel conductors or on higher ampacities triple conductors. Using parallel conductors the wire size would be three ought (3/0) copper.


Underground Street light wire length and drop?

refer to table d3 of cec 2009 for proper calculations,need to know your current, wire size etc.refer to distance correction factor (dcf) formula supplied in cec (canadian electrical code)


Explain wire size as opposed to gauge size?

see American Wire Gauge. The larger the number the small the wire size.


When is wire size and electrical hazard?

Wire size is the gauge (thickness of wire) hazard is almost anything not wired correctly.


How big is 6 gauge wire?

The size of the wire is stated by its gauge under American Wire Gauge. Six gauge wire is size 6 AWG.


What is the cable diameter of a twin copper wire?

There isn't a specific diameter. The thicker the wire the more current it can convey. This diameter will be part of your calculations for your circuit.


Does copper wire insulate?

The insulation on a wire is applied after the wire is drawn to size.


How to calculate the best wire size to use with a 10-32 UNF-2A thread?

10-32 unf-2a <<>> The wire size does not need to be calculated. Use a wire terminal end that crimps to the wire. These terminal end come in various wire sizes and bolt hole sizes. Pick the correct end for the wire size you are using and then in that wire size range, pick the correct bolt hole size that fits the bolt.


How do you size wire for a step down transformer?

You size it by the current required by the secondary, and the primary will be smaller wire.


Is neutral wire same size as hot in 200 amp panel?

Yes, they are the same size wire.