Question: Why The Fuse Is Placed In The Live Wire?

What is the Colour of live wire?

Table of UK plug wiring coloursWireColourLiveBrownNeutralBlueEarthYellow and Green.

Can you fuse the neutral?

A single fuse in the neutral conductor provides protection for neutral-to-phase faults, but not for phase-to-ground faults. This is one reason why a single fuse in the neutral is not permitted.

Where do we connect a fuse with live wire or with neutral wire?

Fuse is always connected to live wire. If fuse wire is connected to neutral wire instead of live wire then even when the fuse burns out, the appliance remains connected to the live wire and the current supply will not be disrupted due to over loading.

Which wire goes to the fuse?

The Brown (Live) wire (br = bottom right) goes into the hole on the right, connected to the fuse (which should be clipped in). The green and yellow wire is the earth wire, and goes through the middle up to the hole in the top.

Is black wire live or neutral?

US AC power circuit wiring color codes The protective ground is green or green with yellow stripe. The neutral is white, the hot (live or active) single phase wires are black , and red in the case of a second active. Three-phase lines are red, black, and blue.

What is the symbol of fuse?

The symbol for a thermal fuse used in any electrical circuit diagram. A thermal fuse is a temperature sensitive switch. It operates on the temperature rather than the current unless the current is sufficient to increase the temperature above the threshold point. This symbol represents a fused switch.

What are the standard fuse sizes?

Standard sizes for fuses and fixed trip circuit breakers, per 240.6, are 15, 20, 25, 30, 35, 40, 45, 50, 60, 70, 80, 90, 100, 110, 125, 150, 175, 200, 225, 250, 300, 350, 400, 450, 500, 600, 700, 800, 1000, 1200, 1600, 2000, 2500, 3000, 4000 5000, and 6000 amps.

Why is fuse connected to live wire?

The fuse is connected to the live wire so that the appliance will not become charged (have a potential difference of 230 V) after the fuse has melted due to excessive current. Fuses must be fitted onto the live wire so that when it blows, it will disconnect (isolate) the appliance from the high voltage live wire.

Is a fuse connected to the live wire?

Fuses are always connected in the live wire in an electrical circuit, like switches, and circuits are always switched off before a fuse is changing.

What is the function of fuse wire?

In electronics and electrical engineering, a fuse is an electrical safety device that operates to provide overcurrent protection of an electrical circuit. Its essential component is a metal wire or strip that melts when too much current flows through it, thereby stopping or interrupting the current.

What should be the property of fuse wire?

Fuse Wire Materials The material used for fuse elements must be of low melting point, low ohmic loss, high conductivity (or low resistivity), low cost and free from detraction. The material used for making fuse element has a low melting point such as tin, lead, or zinc.

Where should the earth wire be connected?

The earth wire connects the appliance body to a metal rod/plate buried under the ground. A lot of mains powered appliances need three wires to work safely. Only two of the wires are used when the appliance works properly. These are the live (brown) and the neutral (blue) wires.

Why the fuse is placed in phase wire only?

Because the fuse can disconnect the circuit only when the excess current flows completely through the neutral. … Since, neutral is not a live conductor coming from the source, disconnecting a neutral line can only open the current path through neutral. But, the live phase still carries the charge.

Which side of plug is black wire?

First make sure any power to the outlet or plug is turned off! The 3 wires used will most likely be Black (hot), White (neutral), and Green (ground). The hot side (or black wire) gets connected to the gold or brass colored screw terminal while the neutral (or white wire) gets connected to the silver screw.

Where is the fuse connected?

Fuses are always connected in series with the component(s) to be protected from overcurrent, so that when the fuse blows (opens) it will open the entire circuit and stop current through the component(s).

What happens if there is no fuse in a plug?

While most of us know that without a fuse, a household plug, and whichever appliance it’s attached to, won’t work. … A plug fuse is a safety device which is connected into an electrical circuit to prevent excessive current flow during fault conditions.

Why fuse is not used in neutral?

Because the fuse can disconnect the circuit only when the excess current flows completely through the neutral. … Since, neutral is not a live conductor coming from the source, disconnecting a neutral line can only open the current path through neutral. But, the live phase still carries the charge.

For which of the following reason fuse is not used?

The fuse in the neutral does not blow, because there is no current in the neutral. The only functional place to put a fuse is in the wire that always will carry current: the hot wire. If there are two hot wires (out of phase wires in 240V circuits in the US), you have to fuse both of them.

Can a fuse be replaced by a wire?

Of course fuses are physically short and wires can be arbitrarily long. Also you cannot replace a piece of wire with an unlimited number of fuses… each fuse has a slight resistance to allow the fuse element to sense the current level; too many fuses will cause a significant voltage drop affecting the loads or circuit.

Which wire is used for fuse?

Generally an alloy of tin and lead is used as the material of the fuse wire as it has high resistivity and low melting point. Usually the fuse wire is a thin wire to be the resistance of the fuse wire is much more than that of the live wire.

What happens if you wire live and neutral wrong?

If you’ve swapped the live and neutral wires then even with the switch off all of the wires and load inside the appliance are energized so it’s much easier to get shocked. … If it’s wired correctly then the screw shell will be on the neutral side, so safe if you accidentally touch it.