# Why the shape of wire is round?

## Why the shape of wire is round?

Round wires are easier to fit with less electric loss Round wires fit easily into round holes, unlike other shapes that are difficult to insert, and are also costlier to make. Also, circular shaped conductors help for minimum loss of electricity.

## Why is there insulation around each wire?

Most electrical wire is covered in a rubber or plastic coating called insulation. The purpose of insulation covering the metal part of an electrical wire is to prevent accidental contact with other conductors of electricity, which might result in an unintentional electric current through those other conductors.

## Why is gold not used for electrical wires?

Gold is not used for making electric wires because it is too rare, and too costlier than Copper. Silver and copper are used for making wires. But, gold is too costlier than these two. So, the resulting cost of the wire will be great.

## How is the circular mil area of a round wire determined?

The area in circular mils of a round conductor is obtained by squaring the diameter, measured in mils. Thus, a wire having a diameter of 25 mils has an area of 252, or 625 circular mils.

## Is 500 Kcmil the same as 500 MCM?

MCM is the old way of denoting the size, and kcmil is the newer way of stating the same thing. So, here is an example of how this works: Lets say you are pulling a run of 500 MCM or 500 KCMIL. That means you are pulling a conductor that has a cross section of 500,000 circular mils. A mil is 1/1000 inch.

250 kcmil

## What size wire is 4 0?

AWG chart

AWG # Diameter (inch) Diameter (mm)
0000 (4/0) 0.4600 11.6840
000 (3/0) 0.4096 10.4049
00 (2/0) 0.3648 9.2658
0 (1/0) 0.3249 8.2515

## What size wire is bigger 1 0 or 2 0?

1/0 is 0 AWG, 2/0 is 00 AWG, 3/0 is 000 AWG and so on with more zeros being thicker wire. This being cladded aluminum wire it’s current carrying capacity is less then what copper wire could carry.

## What is 10 AWG wire?

Tables of AWG wire sizes

AWG Diameter Copper wire
Length-specific resistance
8 0.1285 0.6282
9 0.1144 0.7921
10 0.1019 0.9989

## What is the difference between #2 and 2 0 wire?

2/0 (two naught) pronounced “two not” is a larger wire and will carry the 200 amps by your codes. #2 is good for up to 125 A depending its installation, configuration e.g. in open air, in a raceway, in a 3 wire cable, etc.

## How many amps can 3 0 Wire carry?

Table 310.15(B)(17)

Size Temperature Rating of Copper Conductor
(AWG or kcmil) 60°C (140°F) 75°C (167°F)
1/0 AWG 195 230
2/0 AWG 225 265
3/0 AWG 260 310

## How many amps is #6 wire good for?

Size & AMP Ratings

NM, TW, & UF WIRE (Copper Conductor) SE CABLE (Copper Conductor)
12 AWG – 20 AMPS 6 AWG – 65 AMPS
10 AWG – 30 AMPS 4 AWG – 85 AMPS
8 AWG – 40 AMPS 2 AWG – 115 AMPS
6 AWG – 55 AMPS 1 AWG – 130 AMPS

15 amps

2-gauge

## Will 1 0 aluminum wire fit in a 100 amp breaker?

No, Al #1/0 is good for a maximum of 125A in a dwelling service; possibly 100A if the distance is longer than 100′ or so. A 200A service requires a minimum of #4/0 aluminum or #2/0 copper; upsized accordingly if there is a long distance involved.

## What wire do I use for a 30 amp breaker?

RULES OF THUMB. Many techs will repeat these rules of thumb and rely on them in all circumstances: “Twelve-gauge wire is good for 20 amps, 10-gauge wire is good for 30 amps, 8-gauge is good for 40 amps, and 6-gauge is good for 55 amps,” and “The circuit breaker or fuse is always sized to protect the conductor [wire].”

## What wire size do I need to go 200 feet for a 60 amp service to a workshop?

For 60 amps #6 wire is the right size. Use RHW or THHN type insulation. Wire of # 8 gauge is only good for 50 amps. Make sure to get stranded cable.

## How far can you run 12 gauge wire on a 20 amp circuit?

After these distances, the circuit will go over the recommended 3% voltage drop. You can run a 12 gauge wire up to 70 feet on a 15 amp circuit. That number drops to 50 feet if you run 12 gauge wire on a 20 amp circuit.

## Can I run a 100 amp sub panel off 200 amp main?

Of course you can, you can add the 100 amp breaker to your 200 amp as long as it isn’t overloaded, to start adding the subpanel you must first calculate how many yards it will be from the main panel to the subpanel, there is a formula that calculates how much friction will be on the wire at the connecting distance.

## How big of a subpanel can I install off a 100 amp service?

You can run a 100 amp subpanel off a 100 amp main panel because the total can be up to twice the amperage of the box, meaning you could run a subpanel of up to 200 amps. What’s critical, though, is that the subpanel is safely and correctly connected to the main panel and that you don’t overload the service panel.

20 circuits

## Can you feed a 100 amp sub panel with a 60 amp breaker?

You can feed a 100 Amp panel with a 60 Amp breaker. Keep in mind that the sub panel needs to be rated above the breaker size.

## What size breaker do I need to run a sub panel?

Based on your question, since you will be having a subpanel, you want the breaker feeding the subpanel to be sized for the subpanel or slightly smaller. So if you purchase and install a 200A subpanel, then the breaker should be 200A. If you use a 125A subpanel, then use a 125A breaker.

## What size breaker do I need for a 60 amp subpanel?

It’s recommended to use a 4-gauge wire for 60-amp appliances like an electric furnace or a large electric heater. While it’s common to use a 6-gauge wire for 60-amp breakers in practice, it’s best to use a 4-gauge wire if you’re installing a 60-amp subpanel.

## Does a sub panel need a grounding rod?

Yes. ALL sub-panels in detached buildings require at least one, and sometimes two, grounding electrodes, aka ground rods. For a single circuit feed to a shed you do not need a ground rod. You do need a separate ground bar for the grounds if you install a panel.

## How far can a ground rod be from panel?

To ensure there is no interference from the footing, the ground rod should be placed no closer than 2 feet from the exterior wall of the house.

## Can you use rebar as a grounding rod?

Proper Grounding Rod In most cases, pipe or rebar can be used. The grounding rod needs to be made of galvanized steel and also needs to be at least four feet in length for best results.

## Why are 2 ground rods required?

Suppose you drive the first ground rod for a system. If it has a ground resistance of 25 ohms or more, 250.56 of the 2005 NEC requires you to drive a second rod. Ground rods spaced less than two rod-lengths apart will interfere with each other because their effective resistance areas will overlap (Fig. 2a above).