ARTICLE 110
Requirements for Electrical Installations.
How do you determine the size of a conductor?
Divide the voltage running through the cable by your target current
. If, for instance, 120 volts will act on the cable, and you want 30 amps to run through it: 120 / 30 = 4. This is your target resistance, measured in ohms. 30,000 x 1.724 x 10^-8 = 0.0005172 ohm sq.
How are conductor sizes expressed?
Conductor sizes are expressed in
American Wire Gage (AWG) or in circular mils
. … The smaller the AWG number, the larger the conductor. Example: An 8 AWG conductor is larger than a 14 AWG conductor. On the other hand, the larger the AWG number, the smaller the conductor.
How are wires expressed?
Outside of the United States, wire sizes are commonly expressed
in mm2 and the diameters in mm
. Stranded wire notation usually states the number of strands first, followed by the diameter.
What does AWG mean in wire size?
American wire gauges
(AWG) are a standard set of sizes for wire conductors — the smaller the wire gauge, the larger the diameter in inches or millimeters, and vice versa.
Does every box need a neutral?
Yes install a neutral wire at all switch points
, and like most sections there are exceptions! In order to meet the exceptions you have to comply with one or the other, you will “not” have to install the Neutral only if you meet one of the two exceptions.
What is the minimum size fixture wire?
Article 402 covers the general requirements and construction specifications for fixture wires. As noted in Sec. 402.6, “Fixture wires shall not be
smaller than 18 AWG
.”
What are the 3 types of wires?
The electric power line enters our house through three wires- namely
the live wire, the neutral wire
Which AWG are typically used in residential wiring?
The most common sizes you’ll find in residential work are
14-gauge and 12-gauge
. Larger appliances such as electric stoves, electric water heaters, electric dryers and central air units will often use 10-, 8- or even 6-gauge wire.
How do I know if a wire is AWG?
Look at the insulation on the cable. Search for text written on the insulation.
The last numbers in each string of text represent the AWG
of the wire. If you cannot find any text on the wire, proceed to the next step.
What happens if wire gauge is too big?
using larger wire will not hurt anything or cause any overload.
The larger wire will cost more, the pathway or where it has to fit, and the physical size of the connecting means
(ie. the size of terminal or clamp it has to fit in), will all be determining factors in just how big is too big.
How do I know if my wire is 12 or 14-gauge?
Here’s a simple visual.
Twelve gauge is about the thickness of a nickel
, and 14-gauge is about the thickness of a dime. Also, look at the breaker for the circuit in question to see if it’s a 15-amp or a 20-amp breaker. A 20-amp circuit requires wire that’s 12-gauge or larger.
How do you determine AWG size?
Look at the insulation on the cable. Search for text written on the insulation.
The last numbers in each string of text
represent the AWG of the wire.
Do most homes have a neutral wire?
All houses have a neutral wire
, so the better question is, “Do I have neutrals in my switch boxes?” … If you have an outlet on the wall near the switch, the switch box almost certainly contains a neutral. If they are gang switches, then there’s a much higher likelihood of having neutral wires.
Do older homes have a neutral wire?
In most modern homes in the U.S., if you open your light switch box, you’ll find four wires: load, line, neutral, and ground. … Without a neutral wire, they don’t work, and that’s a problem because
most older homes don’t have neutral wires.
Do switches get neutrals?
Standard rocker
and toggle switches will not have a neutral wire
