Cable Size Calculator

Cable Run

Variables Used-

Things that need to be taken into consideration before computing the cable size and voltage drop.

Phase Selection - The first thing you want is the type of circuit phase you are going to use. Generally there are two phases - Single phase or three phase.

Voltage Drop - Generally we take the percentage of voltage drop and the most common percentage of voltage drop is 3 percent and 5 percent.

Power & Amp - The amount of voltage running through the lines is related to the power and amp. The power and amps depends on the type of circuit phase, you are operating on.

Cable Run - Cable run is the length of the cable, you are going to use while wiring your house or workplace. Make sure you check the resistance and thickness of the wire.

Cable Size Calculation Formulas

Calculations For Both The Phases-

For single-phase circuits:
Wire Circular Mils =
(Conductor Resistivity)(2)(Amps)(One Way Distance in Feet)
Allowable Voltage Drop
For 3-phase circuits:
Wire Circular Mils =
(Conductor Resistivity)(2)(Amps)(One Way Distance in Feet)(.866)
Allowable Voltage Drop

Criteria For Selection Of Best Cable Size?

Cable Selection Based on Ampacity

The ampacity of a cable is the most significant current that can regularly stream through a wire without harming the protection. It is some of the time additionally alluded to as the consistent current rating or current conveying limit of a cable.

Cable Selection Based on Voltage Drop

Greatest voltage drops are commonly determined because heap purchasers (for example, apparatuses) will have an info voltage resilience go. When measuring cables for voltage drop, the highest voltage drop is determined, and afterward, the littlest cable size that meets the voltage drop limitation is chosen.

Cable Selection Based on Short Circuit Temperature Rise

During a short out, a high measure of current can course through a cable for a brief timeframe. This flood in the current stream causes the temperature to ascend inside the cable. In this way, cables ought to be sized to withstand the most significant short out that it is relied upon to see.

What Is The Use Of Cable Size Calculator?

Cable (or conductor) estimating is the way toward choosing suitable sizes for electrical power cable conductors. Cable sizes are typically depicted as far as cross-sectional territory, American Wire Gauge (AWG), or kcmil, contingent upon the geographic district.

The correct measuring of cables is essential to guarantee that the cable can:

  • Work consistently under full burden without being harmed
  • Give the heap an appropriate voltage (and maintain a strategic distance from exorbitant voltage drops)
  • Withstand the most noticeably awful short circuits flows moving through the cable


Read what are the most common doubts among people
What Is The Difference Between Cable And Wire?

A wire is a single conductor(a material most ordinarily copper or aluminum) while the cable is at least two protected wires enveloped by one coat. Different conductors that have no protection around would be named a single conductor.

Why Do We Use A Cable?

Electrical cables are utilized to interface at least two gadgets, empowering the exchange of electrical signals or power from one device to the next. Cables are used for a broad scope of purposes, and Cables are utilized broadly in electronic gadgets for power and sign circuits.

What Is A 3 Core Cable?

Three core and earth cables have three conductors, which are shading coded, dark dim, and darker just as the earth. One of the first applications for this cable is when two-way lighting is required. It gives the extra conductor between two switches working a similar light fitting.

What Causes Voltage Drop?

Exorbitant dropping is because of expanded obstruction in a circuit, commonly brought about by a developed burden, or vitality used to electric power lights, as new associations, segments, or high-opposition conductors.

Which Wire Is Used In Earthing?

Generally Galvanized Iron or copper is utilized for it. Any exceptionally conductive material can be used for earthing. The primary role of earthing is to decrease the danger of genuine electric stun from flow spilling into uninsulated metal pieces of an apparatus, power device, or other electrical gadgets.

What number of Cores Are There In A Cable?

The cable has three cores, a live core, a nonpartisan core, and the earth core. The live and unbiased cores are protected and convey the current to and from the outlet attachment.

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