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# How do I know what size fuse wire to use?

## How do I know what size fuse wire to use?

Find the items that you’re installing and their current requirements. Add the values and divide by 1000 to get your total current in Amps. You can use this value in the fuse size chart above to determine the minimum wire size required.

### How do I know if my wire is 12 or 14 gauge?

Here’s a simple visual. Twelve gauge is about the thickness of a nickel, and 14-gauge is about the thickness of a dime. Also, look at the breaker for the circuit in question to see if it’s a 15-amp or a 20-amp breaker. A 20-amp circuit requires wire that’s 12-gauge or larger.

What size fuse do I need for 10 gauge wire?

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 size fuse do I need for 18 gauge wire?

18 gauge wire is a max of 4.8 amps so I wouldn’t go over a 4 amp fuse otherwise the wire would just melt and could cause a fire.

## Can I use a 13A fuse in a 3a plug?

Don’t put the 13a fuse in place of the 3a fuse, the fuse blew for a reason.

### What is 15 amp fuse wire used for?

Each circuit is protected by a breaker or fuse. Bedrooms, living rooms and family rooms where only lights, alarm clocks and other small electrical items are usually used are normally on 15-amp circuits.

Can I mix 12 and 14-gauge wire?

It’s perfectly safe to use it. Don’t worry about confusing future workers. If they want to add something to the circuit, they will have to go turn off the circuit breaker first, and then they will see they are working with a 15 amp circuit.

What size fuse should I use for 4 gauge wire?

4 gauge wire is commonly used as a main power wire so it will be used as an example here. Fuse ‘A’ must be rated to protect wire ‘B’. Any fuse rated at less than ~150 amps is sufficient to protect a 4g wire and the vehicle but I generally recommend a 125 amp fuse with 4g wire.

## Can I use a 3 amp fuse instead of a 2.5 amp?

Re: Radio calls for a 2.5 amp fuse. Can I use 3 amp? Yup. The fuse is there to protect the wiring and 3 amp is well within the supply wire’s capability.

### How do you calculate fuse size?

Identify the load current in the circuit. See this guide to learn how to calculate load current.

• Identify the smallest gauge wire the load current will flow through.
• Enter values in the calculator below
• What gauge wire for automotive wiring?

Standard automotive primary wire is 18 gauge. This is good for signal wires, but not for hi-current applications. If you replace that section of wire with a piece of 18 gauge, it could cause a fire. Instead, you need to match the original wiring size. In most cases, this will be 12 gauge,…

What is the size of a fuse box?

Fuse Box Dimensions and Types. The 1AG glass fast blow is 5/8 x 1/4″ – 0.63 x 0.25″. The 2AG version measures 0.60 x 0.18″ – 15 x 5mm – 5/8 x 5/17″.