# Can I use a fuse with a lower amp?

Replacing a fuse with a lower value one, however, is not unsafe but may cause problems if the load current is higher than the fuse value. It is thus generally recommended to replace it with a fuse of the same value. However, in some cases, it is probably okay to use a fuse with a lower value.

Similarly, can I use a fuse with a higher voltage?

1. You may use a higher voltage rated fuse anywhere a lower voltage fuse is used, as long as the current rating is the same. THUS, the Handbook statement that you can use a 1 Amp. 250 Volt fuse in a low voltage (e.g. 12 Volt) circuit in place of a 1 Amp. 32 volt fuse. The current rating of a fuse is for AC OR DC.

How many amps is a 250v fuse?

Fuses are rated in amps. Most fuses for household items are 250V. We are told that we can use 250V fuses of the same amperage rating for our nominal 120V circuits. Thus, if I need a 5 amp fuse for an amplifier I get a 250V 5 amp fuse.

What is the voltage rating of a fuse?

The voltage rating of a fuse must be at least equal to or greater than the circuit voltage. It can be higher but never lower. For instance, a 600V fuse can be used in a 208V circuit. The voltage rating of a fuse is a function of its capability to open a circuit under an overcurrent condition.

## Can you replace a fuse with a lower amp?

Replacing a fuse with a lower value one, however, is not unsafe but may cause problems if the load current is higher than the fuse value. It is thus generally recommended to replace it with a fuse of the same value. However, in some cases, it is probably okay to use a fuse with a lower value.

## What are 5a fuses used for?

The fuse breaks the circuit if a fault in an appliance causes too much current flow. Fuses in plugs are made in standard ratings. The most common are 3A, 5A and 13A. The fuse should be rated at a slightly higher current than the device needs: if the device works at 3A, use a 5A fuse.

## How do you work out the fuse rating?

Fuse rating = (watts/volts) x 1.25

• Note the power of the appliance – usually in the appliance manual,
• Note the voltage (240 volts in the UK).
• Use the next highest fuse rating after the calculation. Say the calculated fuse rating is 2.2679 amps, use a 3 amp fuse.
• ## What wire should be connected to the fuse?

Every three pin plug has a fuse connected to the live wire. The fuse has a thin piece of wire inside it, which is the weakest link in a circuit. If too much current flows, the fuse wire overheats and melts, breaking the circuit.

## Why the switch is not connected in neutral?

The Live wire always carries 230V with respect to the Neutral, which happens to be connected to Earth. If you connect the switch to the Neutral. The Live conductor will still be in contact with the device. The device will not operate because the current has no return path to Neutral.

## What happens if you touch live and neutral?

If a fault occurs where the live wire connects to the case, the earth wire allows a large current to flow through the live and earth wires. This overheats the fuse which melts and breaks the circuit. If a faulty live wire touches the inside of the plastic case there’s little risk as the case is an insulator.

## Do neutral wires carry current?

Under normal conditions, a grounding conductor does not carry current. Neutral is a circuit conductor that normally carries current back to the source. Neutral is usually connected to ground (earth) at the main electrical panel, street drop, or meter, and also at the final step-down transformer of the supply.

## Can you touch the neutral wire?

So even the current returns through neutral (only from a connected load that completes the current flow circuit) you touching the neutral with a 0V cant get you a shock. But its not safe to touch neutral wire! It is possible that the path to ground on neutral is not very good.

## Why neutral wire does not give electric shock?

There can also be some voltage drop in a properly wired home/site on the neutral wire because of wire resistance when there is current flowing, but this would be typically be too low to experience a shock from. Neutral is called that because it is not supposed to have potential.

## What will happens if we connect neutral to ground?

A second problem with connecting the ground to the neutral happens if your neutral wire breaks between the outlet and your service entrance. Given a ground to neutral connection, this will cause the chassis of your device to be at the “hot” voltage, which is very dangerous.

## Can I tie the neutral and ground together?

The ground and neutral are only supposed to be tied together at the main panel. In this case, instead of only the neutral carrying current, both the ground and neutral will carry it. Grounding is an important safety aspect of your house.

## Can neutral and ground be on the same bus bar?

If the main service panel happens to be the same place that the grounded (neutral) conductor is bonded to the grounding electrode, then there is no problem mixing grounds and neutrals on the same bus bar (as long as there is an appropriate number of conductors terminated under each lug).

## Why do you need to separate grounds and neutrals?

If we bond the ground wire to the neutral in the sub-panel, current will flow on both the neutral AND on the ground wire. Which means that if you do not keep the ground wires separate from the neutral wires, you will be allowing return currents to flow on the ground wires back to the main panel.

## Is a neutral wire hot?

Ground: The bare wire is called the ground wire. Like the neutral wire, the ground wire is also connected to an earth ground. However, the neutral and ground wires serve two distinct purposes. The neutral wire forms a part of the live circuit along with the hot wire.

## Is neutral black or white?

Black, Red and Blue are used for hot wires and White is used as the neutral wire in a 120/208 V circuit. Brown, Orange and Yellow are used as hot wires and gray is used as the neutral wire in a 277/480 V. For grounding, regardless of the voltage, Green is used.

## What happens if you reverse hot and neutral?

This happens when the hot and neutral wires get flipped around at an outlet, or upstream from an outlet. Reversed polarity creates a potential shock hazard, but it’s usually an easy repair. This wire is commonly referred to as the neutral wire, and it should always be white.

## Can reverse polarity damage electronics?

Reverse polarity damage to 12/24 Volt electronics. Reverse Polarity faults typically occur while jump starting vehicles or installing new batteries. Because of poor design techniques, much of the electronic gear brought into the marketplace over the past several years can be severely damaged by reverse polarity.

## What is the difference between straight and reverse polarity?

A welder should know the meaning of polarity, and recognize what effect it has on the welding process. With few exceptions, electrode-positive (reversed polarity) results in deeper penetration. Electrode-negative (straight polarity) results in faster melt-off of the electrode and, therefore, faster deposition rate.

## What polarity is stick welding?

Note that for stick welding in general, DC+ polarity is most commonly used. It produces a good bead profile with a higher level of penetration. DC- polarity results in less penetration and a higher electrode melt-off rate. It is sometimes used, for example, on thin sheet metal in an attempt to prevent burn-through.

## What is straight and reverse polarity in welding?

A welder should know the meaning of polarity, and recognize what effect it has on the welding process. With few exceptions, electrode-positive (reversed polarity) results in deeper penetration. Electrode-negative (straight polarity) results in faster melt-off of the electrode and, therefore, faster deposition rate.

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