# How do I know what size DC wire I need?

## How do I know what size DC wire I need?

Follow down the column until you find your circuit’s LENGTH IN FEET. D Intersect CURRENT IN AMPS with LENGTH IN FEET to identify the wire size. Example: A windlass rated 80A is 25′ from the battery. Circuit length is 50′, circuit type is ‘non-critical’, and correct wire size is 4 AWG.

## What size wire do I need for 30 amp DC?

3 Answers. #10 AWG is code compliant for 30 amp circuits.

What size wire do I need for 10 amps DC?

Maximum current (amps) in a 12V electrical circuit vs. size (AWG) and length of wire.

American Wire Gauge (#AWG)
Length (feet) Maximum Current (amps)
20 14 12
25 14 10
30 12 10

### How many amps can 16 gauge wire handle?

So, how many amps can a 16 gauge wire handle? Sixteen gauge wire can handle 13 Amps. Unlike most residential wiring, in the 12 to 14 gauge range, there’s not much that 16 gauge wire is used for, except for automobiles.

### How far can DC power be transmitted?

As of 1980, the longest cost-effective distance for direct-current transmission was determined to be 7,000 kilometres (4,300 miles). For alternating current it was 4,000 kilometres (2,500 miles), though all transmission lines in use today are substantially shorter than this.

What is the common wire in a DC circuit?

“Common” is a point of reference shared throughout a circuit, typically the node in reference to which every other node is described. In the case of a single-pole double-throw (SPDT) switch, common (also called the pole) is the terminal which the “normally open” and “normally closed” terminals switch to.

#### How much DC current can a 16 gauge wire carry?

According to the NEC Code of allowed ampacities, the 16 gauge wire handles 18 amps at a 90ÂșC temperature rating. However, it is commonly used in extension cords at a lowered ampacity.

#### What size wire do I need for a 15 amp circuit?

14-gauge wire
A 15-amp circuit is usually served by 14-gauge wire and is protected by a 15-amp circuit breaker or fuse. A 20-amp circuit, protected by a 20-amp breaker or fuse, must be served by 12-gauge or 10-gauge wire.

How do you calculate wire size?

Derive the formula for calculating the AWG wire sizes. This will be given by the general formula Dn = (D0)r ^((N-(d + n))/N), where Dn is the diameter of n gauge wire, r is the ratio between the largest and smallest wire, N is the number of draws needed to obtain the smallest wire from the l, and d is the offset of the largest gauge from 0.

## What size wire do you need for a 20 amp?

For a 20 amp circuit, use 12 gauge wire. For a 15 amp circuit, you can use 14 gauge wire (in most locales). For a long run, though, you should use the next larger size wire, to avoid voltage drops. 12 gauge is only slightly more expensive than 14 gauge, though it’s stiffer and harder to work with.

## How do you calculate conductor size?

The formula for calculating the size of conductors for direct currents, where the length, load, and loss in volts are given, is as follows: The size of conductor (in circular mils ) is equal to the current multiplied by the distance (one way) multiplied by 21.6, divided by the loss in volts; or, CM= C X D X 21.6.(1)

What is the amperage rating of 10 gauge wire?

NEC 10-gauge copper wire has a rating of 30 amps. 10-gauge solid copper wire in general has a resistance of almost exactly 1 ohm per 1000 feet. The rating is limited by how much heat the insulation was designed to withstand.

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