# How do you calculate electrical cable size?

## How do you calculate electrical cable size?

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.

What size cable is 2.5 mm2?

Cable Size Ratings in Amps

Cable size Rating in Amps
2.5mm 27
4mm 37
6mm 47
10mm 65

### How do you calculate copper cable size?

ρ = Specific resistance or resistivity of Conductor. D = Distance in Feet (One way) i.e. ½ the total circuit length. I = Load Current….Copper & Aluminum Wire & Cable Size Calculator.

Wire Size
Copper Aluminum

What diameter is 10mm cable?

19.5mm
10mm nominal cross sectional area. 19.5mm overall cable diameter.

## What is 10mm cable used for?

10mm earth cable is suitable for fixed wiring of electrical equipment, lighting and household appliances Usually used for grounding wires.

What is the meaning of 1.5 sq mm cable?

For 2.5 Sq.mm = 6×2.5 = 15 Amp, For 1 Sq.mm = 6×1 = 6 Amp, For 1.5 Sq.mm = 6×1.5 = 9 Amp. For Cable Current Capacity = 4X Size of Cable in Sq.mm, Ex.

### What is the formula to calculate the cable size?

Cable size calculation formula: The cable size is equal to the 1.5 times of the full load current of the motor/load. Hence the cable rating formula can be written as, Cable size = 1.5 x Full Load Current.

How do you calculate electrical wire size?

Amps = Watts divided by volts

• Feet = One-way wire distance
• % Volt Drop = Percentage of voltage drop acceptable for this circuit (typically 2% to 5%)
• ## What size wire do I need calculator?

For example, if you want to create a 12-gauge wire from 20 gauge wires, first select 20 gauge from the Wire Gauge list, then select 12 gauge from the Effective Gauge list; the required number of wires is 6. This calculator determines the effective AWG gage of a combination of wires of differing AWG gages.

How do you calculate power cable size?

The formula for calculating cable size for single phase circuits is wire circular mils = (conductor resistivity)(2)(amps)(one way distance in feet) / allowable voltage drop. This formula is based on Ohm’s Law.