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American wire gauge (AWG) is a standardized wire gauge system for the diameters of round, solid, nonferrous, electrically conducting wire. The larger the AWG number or wire guage, the smaller the physical size of the wire. The smallest AWG size is 40 and the largest is 0000 (4/0).
Ampacity Calculations #2 What is the Maximum allowed ampacity for a single #2 THHN Conductor not installed in a circuit. Step 1. Table 310.15(B)(16) (90°C Column) Step 3. Read Ampacity 130 Amps
120/240 volt, 3 wire, single phase service-entrance conductors, service lateral conductors and feeder conductors that serve as the main power feeder to a dwelling unit and are installed in raceway or cable with or without an
Type NMB cable (a.k.a. Romex) is the most widely used wiring method in residential dwellings. NM cable must have 90 degree C conductor insulation rating which is designated on the cable sheath by a “B” [334.80]. #14-2 and #12-2 AWG NMB cable is used for lighting and receptacle circuits, while #10-2 AWG NMB is used for electric water heaters.
Temperature Rating of Conductor [See Table 310.104(A).] Size AWG or kcmil 60°C (140°F) 75°C (167°F) 90°C (194°F) ... (2) for the ampacity correction factors where the ambient temperature is other than 30°C (86°F). ... 310.15 ARTICLE 310 — CONDUCTORS FOR GENERAL WIRING 70–154 NATIONAL ELECTRICAL CODE 2011 Edition. Created Date: 8/12 ...
Installation should only be carried out by suitably qualified and approved persons, in accordance with the IEE on site guide and the IEE guidance note material. The tabulated current ratings are for cables in free air but may also be used for cables resting on a surface.
Wire Size & Amp Ratings • Ampacity is the maximum current that a conductor can carry continuously under the conditions of use without exceeding its temperature rating. Current is measured in amperes or “amps.” You must use the correct size wire for the current (load) requirement of the circuit to prevent the wire from overheating.
