Electrical cable size Chart amps

Wire Size Chart and Maximum Amp Rating

The wire size chart below shows allowable ampacities of insulated conductors rated up to and including 2000 Volts, 60°C through 90°C (140°F through 194°F), not more than three current-carrying conductors in raceway, cable, or earth (directly buried), based on ambient air temperature of 30°C (86°F). Wire Size Chart and Maximum Amp Rating 12 AWG - maximum of 25 Amps in free air, maximum of 20 Amps as part of a 3 conductor cable; 10 AWG - maximum of 40 Amps in free air, maximum of 30 Amps as part of a 3 conductor cable. Check your local electrical code for the correct current capacity (ampacity) for mains and in wall wiring 1. DC Amps 25A 30A40A 50A 60A 70A 80A 90A 100A 120A 150A 200A Step 5. Cable Conversion TableMatch the correct coloured symbol from the previous step using the table below to find the cable size and specifications The rule of thumb for 100 amp service is that you go with a wire size gauge 1. 125 amp requires a wire size 2/0. For 150 amp, the right wire size is 3/0. For 200 amp service, you will want a wire size 250 kcmil. For 300 amp, the right wire size is 500 kcmil. 400 amp service requires a wire size of 1,000 kcmil

Table of Common Electrical Wire Sizes and Amps or Fuse Ratings - Residential SEC Cable & Other Wire Ampacities for 1-3 Current-Carrying Conductors in Cable, Earth, or Raceway For 120/240-volt systems sized between 100 and 400 ampere To calculate the amperage for a circuit, first add up the wattage of all the electrical devices that will be on the circuit. Then, divide the total wattage by the voltage of the system, 110 or 220, and that will give you the expected current or amps. Wire Size and Amp Ratings View Wire Size and Amp Ratings in a new window The rule of thumb that techs will usually go by is that for a 30 amp circuit breaker, 10-gauge wire is the right size to go with. For a 40 amp you need a 8-gauge wire size and for a 20 amp, you will need a 12-gauge wire size 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 equipment grounding conductor. For application of this section, the mai Common sizes include 14-, 12-, 10-, 8-, 6-, and 2-gauge wire. The size of the wire dictates how much current can safely pass through the wire. Electrical current is measured in ampacity, and each wire gauge has a maximum safe carrying capacity. For standard non-metallic (NM) cable, these amperage capacities are

Wire Size Calculator. Enter the information below to calculate the appropriate wire size. Voltage - Enter the voltage at the source of the circuit. Single-phase voltages are usually 115V or 120V, while three-phase voltages are typically 208V, 230V or 480V. Amperes - Enter the maximum current in amps that will flow through the circuit The number and type of electrical devices connected to a circuit determine the ampacity requirement of the conductor. Usually, a general-purpose house circuit is designed for 20 amps. Lighting circuits may be designed for only 15 amps Conductor Size (AWG) Maximum Current Carrying Capacity Length 6 - 50 feet Length 51 - 100 feet 2 Wire 3 Wire 2 Wire 3 Wire #18 10 7 7 5.6 #16 13 10 10 7 #14 18 15 15 10 #12 25 20 20 15 #10 30 25 25 20 #8 40 35 35 25 [ Cable Size & Current Rating Chart. Cross Section (mm2) Approximate Overall Diameter (mm) Current Rating. Single Phase (Amps) Three Phase (Amps) 1.5. 2.9. 17.5

70, 80, 100, 125, 150, 200, 400, 600 Amp Wire Size Char

This is a good goal to shoot for when sizing the conductors for an underground cable. The following are the maximum lengths of cable you can use while still maintaining a 3 percent voltage drop for the given wire size (AWG) and circuit voltage. As an example, for a 120-volt circuit, you can run up to 50 feet of 14 AWG cable without exceeding 3. Calculating Wire/Cable Size formula for Three Phase Circuits. Wire Circular mils = √3 x 2 x ρ x I x L / (% Allowable Voltage drop of source voltage ) Note: the Value of ρ = Specific resistance or resistivity of Conductor is used here for copper and aluminum is 11.2 and 17.4 respectively at 53° C (127° F) Also check the Good to know. Reference Method F (in free air or on a perforated cable tray etc horizontal or vertical etc.) Reference Method G (in free air) Touching: Spaced by one cable diameter: 2 cables, single-phase a.c. or d.c. 3 or 4 cables, three-phase a.c. 2 cables, single-phase a.c. or d.c. 3 or 4 cables, three-phase a.c. 2 cables, single-phase a.c. or d.c. flat. Electric Cable Sizes and Amp Ratings for the UK - Electrical Resistance and Cable Rating Tables. Find out about cable sizes for electrical use in the UK and 1.5mm and 2.5mm and other Electric cables and the current they carry. Also learn about what electric flexes and electric wires do and protected against overloading Extension Cord Size Chart - Understanding Wire Gauge and Amps. by Clint DeBoer. After searching the Internet recently, we realized people needed a definitive extension cord size chart. This chart breaks down how both the wire gauge and length of the extension cord affect its ability to convey power to a corded tool. Running a 15-amp tool

cable, but this increases costs. The acceptable maximum voltage drop for DC loads is 5% of nominal battery voltage. The chart and the formula on this page are provided to help you in selecting the best cost / power loss compromise. WIRE CHART 12 Volt acceptable cable size (mm†) Cable Length (metres) Amps 1 2 5 10 15 20 25 3 From the table of Aluminm SEC Cable Sizes for Long Runs you'll see the answers given below, Answer: 200A, Aluminum wire, 400 foot run, direct buried SEC cable. For single phase power: 1000 kcmil aluminum wire will have a voltage drop under 3% fora 400 foot run of direct buried cable and a 200VAC single phase electrical service Choosing the correct wire. A Locate the CURRENT IN AMPS of your appliance across the top of the chart. Most electrical products include a rating label, or you can find the amperage rating in the documentation that came with the product. B Find circuit LENGTH IN FEET along the left side of the chart. Note that the total length of the circuit is. The Gauge Guide bullets will help you determine the overall size (including insulation) of an unmarked cable. Actual diameters may vary depending on the age, make and insulation thickness of your cable. Check out our Printable Version PDF to more accurately measure the end of your cable against Gauge Guide bullets

Select the type conductor wire material, the circuit voltage and the phase of the circuit. Enter the total amperage on the circuit; also enter one half of the total length of the circuit. A sample of 120 volts, single phase, copper wire, 144 feet (one half of a 288 foot circuit) with 10 amps load on it yields a number 10 awg wire size Load: Unit Heater 10 KW, 230V, 3 phase, find I, wire size, circuit breaker size Conduit Size I = 10 KW = 25.1 Amp .23 KV √3 Wire Size- 25.1A = 31.3 Amp .8 NEC 310-16 Use #8 good for 45 amp, 3 #8 + 1 #8 ground in 1 RGC Table 3A Circuit Breaker = 25.1A = 31.3 Amp so use 35A .8 Conduit Size if different size wires are used 6/14/02 Chapter 3. Allowable ampacities of insulated copper conductors rated up to and including 2000 Volts, 60°C through 90°C (140°F through 194°F), Not more than three current-carrying conductors in raceway, cable, or earth (directly buried), based on ambient temperature of 30°C (86°F). Size. Temperature Rating of Copper Conductor. (AWG or kcmil

ABYC Ampacity Rating Table at 30°C. For bundles of 4 to 6 conductors multiply by 0.857. For bundles of 7 to 24 conductors multiply by 0.714. For bundles of 25 or more, conductors multiply by 0.571. SAE conductors are smaller than equivalent AWG by 5%-12% with current capacity typically less by 7% AMPACITY CHARTS • Amperage is a measure of the electrical current flowing through a circuit. Current is measured in amperes or amps. You must use the correct size wire for the amperage requirement of the circuit to prevent the wire from over heating 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

Electrical wire sizes & Diameters, Wire Size Tables for

  1. Amperage (Amps) versus Wire & Cable Size [ MM to AWG ] UL486E - Assigned maximum ampere rating versus wire size for copper conductors. Values are for not more than three conductors in raceway or cable (reference: National Electrical Code, ANSI/NFPA 70-1999). AWG to MM2 PDF. Check back soon to download our MM to AWG Conversion PDF
  2. For every extra 50 feet of cable/wire up to #8 normally you upgradeto the next size, consult you local codes if your unsure about doubleand triple length runs. Ex: #6 is sometimes mandatory for a 200 foot 12 amp run but can be used up to 300 feet on a 12 amp circuit
  3. What size wire for welder extension 6 4 soow electrical wire 600v so 12 3 awg sow cable cord the best micro usb cable reviews by 4 soow cable cut by the foot wire Extension Cord Power S Rating Custom Types Lengths 1xtech Because You Require Quality QuicklySoow Cord Allied Wire CableExtension Cord Power S Read More

In summary, when selecting the correct size of battery cable, you need to take into account the total maximum amperage your electrical system requires, the voltage of your system (usually 12 volts), the total length that your cables need to be, and the amount of voltage drop you are willing to accept versus the amount you want to spend Electrical cable size chart amps with reference to plasterboard ceilings or joists covered by thermal insulation less than 100mm are shown below: Cable Size Current Rating(Amps) 1mm: 13: 1.5mm: 16: 2.5mm: 21: 4mm: 27: 6mm: 34: For cables that are installed with the clipped direct method the following electrical cable sizes chart applies

4) Circuit Breaker size. 5) Types of cable ( PVC,XLPE,Fire proved) 6) Installation Condition ( Underground, trefoil,trunking,tray or conduit) 7) Distance / length of cable run from source to load . Calculation for sizing electrical cable/wire Ib ≤ In ≤ Iz. Ib = Amperage load. In = Circuit Breaker size. Iz = Current rating for cable/wire. Dec 3, 2019 - Wire Ampacity Rating Chart Wiring Distance Chart Electric Wire Sizes Chart Electrical Wire Amp Rating Chart Awg Vs Amps Wire Gauge Ampacity Chart 12VBack T Frequently Asked Electrical Questions. Wire Gauge and Voltage Drop Calculator. NEC Reference Tables (2011, 2008, 2005, 2002, and 1999) Electrical - The Basics. Residential Electrical Guidelines and Codes. Rough-In Electrical and Pulling Cable. Breakers and Fuses. Wire Types and Sizing. Sizing Your Electrical Servic

Wire Size and Amp Ratings : McGowan Electric Supply, Inc

The charts below contain recommended minimum wire size (AWG) for different voltage, horsepower and cable length combinations. These charts are only a guide. Please consult the National Electric Code (NEC) and any applicable local standards for exact requirements. Single Phase (115 Volt) - Wire Size Selection Guide*. HP. Cable Length. Up to 30'' Reference the Wire Size column in the same row of the Universal Wire Sizing Chart as the Ampacity value that meets or exceeds the planned amperage for the circuit to find the appropriate wire gauge for the circuit distance AUTOMOTIVE Wire Amperage Capacity Chart Recommended Length and Amperage for Automotive Wire while maintaining a 2% or less voltage drop at 12 volts Automotive Wire Size 5 Amps 10 Amps 15 Amps 20 Amps 25 Amps 30 Amps 20 Gauge Wire (AWG) 4.5 ft 2.2 ft 1.6 ft . 18 Gauge Wire (AWG) 7.3 ft [ For example, a 10-gauge wire is bigger than a 12-gauge wire. Larger wires can carry more amperage and wattage than smaller wires. The below electrical wire sizing chart shows both the recommended 80-percent wattage load and the absolute maximum 100-percent wattage load for the most common wire gauges Common US AWG wire gauges and amps ratings. 1) Current ratings for up to 1000 V, PVC-insulated single and multicore wiring cables, ambient temperature up to 30 o C Download and print AWG chart. Values for resistance are based on electrical resistivity for copper 1.724 x 10-8 Ω m (0.0174 μΩ m) and electrical resistivity for aluminum 2.65 x 10-8 Ω m (0.0265 μΩ m)

20, 30, 40, 50, 60 amp wire & breaker chart: What size do

  1. e the load, add up the wattage of all electrical devices that will be on the circuit and divide this total by the voltage of the circuit, usually 120 volts or 240 volts. 120 Volt, Conductor size (AWG or kcmil) Single Phase, Max 3% Voltage.
  2. After searching the Internet recently, we realized people needed a definitive extension cord size chart. This chart breaks down how both the wire gauge and l..
  3. 40 AMP Wire Size. For a maximum of 40 amps, you'll need a wire gauge of 8. Many electric cooking appliances require 40 amps such as electric cooktops. 50 AMP Wire Size. For a maximum of 50 amps, you'll need a wire gauge of 6. Fifty amp breakers are most often used to power many different appliances. However, a kitchen oven can alone require.

Matching Wire Size to Circuit Amperag

This electronics video tutorial focuses on the american wire gauge - AWG. It discusses the relationship between wire size, amperage, diameter in mm, and res.. Use the charts below to determine the correct wire gauge, based on the amount of current in the circuit and the length of the wire run. Even the experts have to check occasionally on the correct gauge and ampacity (maximum amount of electrical current a conductor can carry) of wire for a given marine DC load

Online Wire Size Calculators & Table

Ampacity Charts - Cerrowir

Here voltage drop for 70 Sq.mm Cable (5.8 %) is higher than define voltage drop (5%) so either select higher size of cable or increase no of cable runs. If we select 2 runs, than voltage drop is 2.8% which is within limit (5%) but to use 2 runs of cable of 70 Sq.mm cable is not economical, so it's necessary to use next higher size of cable 20 HP,415 v,0.8 of,3phase,0.85efficiency,1440 rpm and delta connected induction motor is to be connected to a motor control center by a cable of length 15 m,this cable is running with three other cables,ambient temperature is 45 degree Celsius and fault level is 20 KA,select the size of the cable from belo

electrical - What size wire for 100 amp sub-panel from a

• Permanently connected appliances. (Note that appliances rated above 10 amps require a dedicated circuit, but up to 10 amps may be wired as part of power outlet circuit.) 1.5: Yes: 18: 4.25 • Water heater with maximum element rating of 3 kW. 1.0: Yes: 14: 3.25 • Lights with maximum load on any one circuit of 10 amps 271pcs Wire terminals Crimp connectors,19 Types Insulated Electrical Cable Spade Set,Color Red Yellow for 12 Types 22-10 AWG US and EU Standard,Copper PVC Tinplate. 4.5 out of 5 stars. 5. $14.99 American Wire Gauge (AWG) Sizes and Properties Chart / Table. Table 1 lists the AWG sizes for electrical cables / conductors. In addition to wire size, the table provides values load (current) carrying capacity, resistance and skin effects. The resistances and skin depth noted are for copper conductors. A detailed description of each conductor. Calculate Your Voltage Drop. Determines wire size to meet specific voltage drop limits or calculates voltage drop for a specific conductor run. When sizing conductors, calculations limits wire size to voltage drop and NEC ampacity. Southwire's Voltage Drop Calculator is designed for applications using AWG and KCMIL sizes only

Cord Length and Current Rating Chart Construction

  1. Because it is 25 amps instead of 24 you have to go up a size in wire. Wiring a 120 V heater can be a little different as some units just plug straight into the wall. As a rule of thumb you can safely go up to 1500 W on an electrical outlet
  2. 2 amps at 15 feet is calling for 12ga wire. Find the size of fuse by multiplying the amps required by the device (2) by 1.5. 2×1.25 = 2.5 then we will round up to the nearest fuse size (in multiples of 5 amps) which would call for a 5 amp fuse. Cross Reference that fuse size to verify that it's below the Maximum fuse size called out by this.
  3. Amp Chart Lead Wire Current Carrying Capacity (Ampacity) AWG SIZE Insulated Conductor Temperature Rating AWG SIZE at 80°C at 90°C at 105°C at 125°C at 150°C at 200°C 40 0.33 0.49 0.55 0.60 0.71 0.78 40 38 0.47 0.68 0.7
  4. e what size wire you should be using based on AMPS being pulled and the length of the wire you will be running. Remember, when in doubt bigger is always better. And always use a fuse smaller than the rating of the wire to prevent fires
  5. A typical electric dryer draws 30 amps and must be wired with 10-gauge cable, while an electric range or hot tub, which draw 50 amps each, must be wired with 8-gauge copper wire. Some energy-efficient home air systems draw only 40 amps and can also be wired with 8-gauge cable, while less efficient ones may draw 60 amps and call for 6-gauge cable
  6. The amperage rating of a cord is a function of the wire gauge, number of current carrying conductors and length of the cord. When a cord has three current carrying conductors there is a decrease in amperage. Likewise, when the length of the cord exceeds fifty feet there is a decrease in amperage. Use the amp chart below to look up the rated.
  7. ed by amperage and distance. The chart below tells you the wire size you need for 240/120 VAC. On the left column find the amps that your circuit must supply. Then follow that row to the right until you find the distance of your circuit from the supply to the equipment you are feeding

Cable Size & Current Rating Chart - spwales

Wire Size Selection Trade Offs Between Keeping it Cool and Getting Power to the End of the Wire . . . . If the material from which wires are made had zero resista nce, then any size wire could carry any amount of current! Con sider the formula for power where watts = volts x amps. This relationship works whether the watts are use Wire size is usually identified as the area of the conductor in square millimeters. The following sizes are for 60ºC insulation, copper wire, 3 current carrying conductors in a raceway. Sizes over 6 square millimeter are normally stranded so the measured diameter will be slightly larger The wire sizing guide below provides the minimum wire size needed to limit voltage drops to 5% at a given distance in a 12V or 24V system. If you want to limit your losses to 2% simply divide the distance by 2.5. For a 48V system multiply the distance taken from the 24V chart by 2. The dashes represent currents which cannot be handled by the.

Selecting the Proper Size Welding Cables Lincoln Electri

n = -39 log 92 (Dn ÷ 0.005 inch) + 36 = -39log 92 (Dn ÷ 0.127 mm) + 36.. Universal Wire Sizing Chart Apart from the above formula, you can use the following steps for any voltage or voltage drop. It can also be used for American (AWG) or metric (mm 2) sizing.This calculation is applied to typical DC circuits and a few simple AC circuits Amps Watts Wire Size NEMA Receptacle; This chart is intended as a general guideline only for kiln wiring gauges. This chart is based on breaker size used, not kiln's amperage rating. This chart is based on wiring with an insulation value of 167˚F or better. Local codes will vary and will supersede this chart. FIREBOX 8x6 LT : 1 : 115V: 15A. Cable Size Ratings in Amps Cable size Rating in Amps 1.5mm 20 2.5mm 27 4mm 37 6mm 4

Wire Size: Amps: Wire Type: 3/0 Gauge: 200 Amps: Service entrance: 1/0 Gauge: 150 Amps: Service entrance and feeder wire: 3 Gauge: 100 Amps: Service entrance and feeder wire: 6 Gauge: 55 Amps: Feeder and large appliance wire: 8 Gauge: 40 Amps: Feeder and large appliance wire: 10 Gauge: 30 Amps: Dryers, appliances, and air conditioning: 12 Gauge. Designers of low voltage power circuits are often unaware of the implications of voltage drop and wire size. In conventional home electrical systems (120/240VAC), wire is sized primarily for safe amperage carrying capacity (ampacity). The overriding concern is fire safety. In low voltage systems (12, 24, 48VDC) the overriding concern is power loss 19,310 Posts. #4 · Oct 19, 2018. ShadowOps said: Hi, new to the forum. I have and existing 1200 amp service with underground transformer the utility is installing a pad mount, secondary wire is to short, we have 3 conduits. I came up with 600mcm cu, but the utility has a maximum conductor size of 500mcm cu for pad mount transformers

Questions About Cables, Wires & Conduit For A 100 Amp

kW to Cable Size Chart & Electrical Cable Size Chart Amps

Wire size must be matched to the load and the breaker or fuse it will be connected to. The use of wiring that is too light for the load, a breaker or fuse that has a higher amperage rating than the connected wire, or a connected appliance or sub panel that is too large for the wiring are the main causes of electrical fires The American Wire Gauge (AWG) system provides the sizing of wires. The higher the number of the gauge, the smaller the size of the wires. The National Electrical Code (NEC) mandates the regulations for wires and cables that can be used for electrical applications. Key Definitions. Amperage: A measurement of electric curren For copper wiring with a 200 amp service, you will need to use #4 AWG copper wire. AWG stands for American wire gage, which is the standard for wire gage in the US. The next option for a 200 amp service, is aluminum, or copper-clad aluminum. If you are planning on using aluminum wiring, keep in mind that it has lower conductivity than copper DC Wiring Chart. The chart is calculated on no more than 2% voltage drop across the wire distance. The distance is twice your length. If you are running a 2' cable then your distance for the chart is 4'. This accounts for the round trip distance of the run. This chart was not prepared by an electrical engineer Use a wire gauge amp chart to determine the approximate wire size for an electrical load. There are separate charts for different types of wire. Since the resistance of electricity is dependent on several factors, the chart cannot give the exact size for every application. In the United States, wire is sized using the American wire gauge system.

American Wire Gauge Chart and AWG Electrical Current Load

What size of electrical wire do I need for an 800 amp single phase underground service that will be 350 feet from the - Answered by a verified Electrician We use cookies to give you the best possible experience on our website Maximum current - amps - through a 12V circuit - related to size (AWG) and length of wire. Conductors in electrical systems should not be sized with voltage drops exceeding 3%. For a 12V system the maximum voltage drop should be less than ( 12 V) x 3% = 0.36 V. Conductor sizes ( AWG) related to maximum current through a 12V electrical copper. Amps. Cable Run Length (m) Calculate. Results Phase : Power : Length : Core Size : Voltage Drop : Calculate Another Disclaimer. The recommended cable sizes are based upon information provided by the user and are intended as a guide only. Electrical Cable Size Calculator; Testimonials; New Account; Online Catalogue; Melissa Electricals. 58. What size wire do I need for a 50 amp sub panel? Check what size cable you will need for the amperage chosen and the length. For example, 6-3G cable is designed for 50 amps when the length of wire does not exceed 55 feet. Beyond that length, a thicker wire is required, due to the voltage drop. Don't forget to share this post American Wire Gauge (AWG), also known as the Brown & Sharpe wire gauge, is a logarithmic stepped standardized wire gauge system used since 1857, predominantly in North America, for the diameters of round, solid, nonferrous, electrically conducting wire. Dimensions of the wires are given in ASTM standard B 258. The cross-sectional area of each gauge is an important factor for determining its.

Technical | Eichten Service and RepairElectrical Cable RingsMaxxum 5100 battery wire size, awg 2/0 or larger

Wire Current Ampacities NEC Table 310-1

used when figuring electrical material needs and is already calculated in the chart. MAXIMUM ALLOWABLE WATTAGE (80% of Breaker Max.) Single Phase BREAKER SIZE WIRE SIZE Based on copper THHN wire - increase one size when using aluminum conductors AT 115 VOLTS AT 230 VOLTS 15 amp #14 1,380 2,760 20 amp #12 1,840 3,680 30 amp #10 Seldom used on. American wire gauge size calculator and chart. Wire gauge calculations Wire diameter calculations. The n gauge wire diameter d n in inches (in) is equal to 0.005in times 92 raised to the power of 36 minus gauge number n, divided by 39:. d n (in) = 0.005 in × 92 (36-n)/39. The n gauge wire diameter d n in millimeters (mm) is equal to 0.127mm times 92 raised to the power of 36 minus gauge. Electrical Wire Size Calculator. This should be used as a reference only. Please check with your electrical inspector or a licensed electrician for the proper wire size. There are many factors to consider before choosing the proper gauge. wire size

Cable Ampacity Chart - bedowntowndaytona

Sizing Electrical Wire for Underground Circuit Cabl

The chart below shows the capacity of various wire gauge sizes and their typical amp rating and application for both residential and solar applications. Commercial solar PV panels over 50 watts or so use 10 gauge (AWG) wires. This allows up to 30 amps of current to flow from a single panel This free voltage drop calculator estimates the voltage drop of an electrical circuit based on the wire size, distance, and anticipated load current. In addition, experiment with the resistor and Ohm's Law calculator, or explore hundreds of other calculators addressing math, finance, fitness, health, and more

I just got hired to wire up a new electric range, and when I looked at the nameplate and the installation instructions, I wound up unsure as to what size circuit I should install. The nameplate rating for 120/240V said 14.4 kW. My calculator says that the amperage for such wattage would be 57.5 - 60A (depending on whether you use 240V or 250V) A wire ampacity table is a chart displaying the electrical amp rating carried by specific wire types and gauge sizes. Amperage is a measure of the electrical current flowing through a circuit, which is measured in amps. Proper wire size must meet specific amp limits. A wire carrying a current beyond its amp limitations can overheat and become. Electrical tools (MS Excel Spreadsheets) This section is dedicated to tools every electrical engineer can use in daily work.These spreadsheets below will make your job much easier, allowing you to shorten the time used for endless calculations of cables, voltage drop, various selections of circuit breakers, capacitors, cable size, and so on Online electrical calculator which helps you to calculate the size of copper, aluminium wires in an electrical circuit. Calculate Copper, Aluminium Wire Size in Electrical Circuit Source Voltage -- Select Source Voltage -- 120 Volt 240 Volt 480 Vol