A switch in the electrical circuit is always connected to the live wire so that the socket/appliance is not live when it is switched off. A fuse is usually a thin piece of wire that will melt and break the circuit if too large a current flows through it..
Also, which wire live neutral or earth connects a switch Why?
This simply means that the current should flow from a source, through the appliance and back to source. The live wire carries the current to the appliance, while the neutral wire carries it back. The earth wire is for our protection, in case the live wire makes a contact with metal casing of an appliance.
Subsequently, question is, what happens when switch is connected to neutral wire? If switch is connected in the neutral wire, an electric appliance, e.g., an electric iron will remain connected to the live wire even when the switch is off and so if any one happens to touch the appliances; he of she will get a shock which is sometimes fatal.
In this manner, which wire is load and which is line?
Line is the side of the device where the wires from the panel (or other equipment feeding the device) are connected. Load is where any devices that are to be protected by the GFCI device are connected. Most "newer" GFCI devices will not reset if they are not connected probably.
How can you tell if a wire is live?
With a live circuit, you can identify the 'switched' live conductor at the light fitting. Switching on the switch will make one of your blacks become live. With a digital multi-meter set this to AC volts. When the switch is closed you will see 230 V between neutral and the switched live black.
Related Question Answers
Where does the switched live wire go?
The permanent live wire is wired into the switch and the switched live into the switched live terminal. The neutrals are connected together using a terminal connector. You can also see that another live and neutral wire go to the next light switch.What is the function of the neutral wire?
The neutral wire is often confused with ground wire, but in reality, they serve two distinct purposes. Neutral wires carry currents back to power source to better control and regulate voltage. Its overall purpose is to serve as a path to return energy.Can I use 2.5 mm cable for lighting?
You will find twin core and earth cabling used all over your home in a variety of sizes. 2.5mm is commonly used for behind sockets, while 1-1.5mm is most often used for lights (depending on how many lights you have in a circuit).What happens if live wire touches earth?
If a live wire touches the earth wire, you get a spark and the circuit breakers blow.What happens if you switch hot and load wires?
Here's what happens when somebody wires a GFCI receptacle with the load and line wires reversed: The GFCI will work, in the sense that you can plug in a hair dryer and the hair dryer will blow hot air. If the load and line wiring gets messed up, a ground fault (radio in the tub) won't trip the GFCI.What color wire is load?
The color for the Line wire is usually black and Load wire is usually red, black, or blue (less common).What is common wire?
A common wire is a more general term and simply refers to the 0 Volt wire of a circuit, either electrical or electronic.What is a line load?
Line loads: Loads exert a load along a line, such as a partition's weight on the floor. Distributed (or surface) loads: These exert a load over a surface area, such as the weight of floors and roofing materials.Which black wire is the load?
Any circuit's black wire should be considered hot or live. Black wire is never used for a ground or neutral wire and should be used as the power feed for a switch or an outlet. A black wire is often used in a circuit as a switch leg, the connection that runs from the switch to the electrical load.What is load on a switch?
Most common switches can be connected any way the user chooses. In an AC circuit the supply is the source of power and the load is anything that you are switching on or off to control it like a light fitting, element, motor etc.How do you know which wire is black or line?
Line Connection The circuit's hot wire (typically colored black or red) connects to the black or brass-colored screw terminal marked LINE. The white neutral wire connects to the silver-colored screw terminal marked LINE. The markings for line and load usually are printed on the back of the outlet's plastic body.What is the load line on a switch?
Line is the wire going from a current source into a switch. It's upstream of the switched device(s). Line is always hot. Load is the wire going from the switch to the device.Will a light work if wired incorrectly?
But here's the catch: If you connect the circuit wires to the wrong terminals on an outlet, the outlet will still work but the polarity will be backward. When this happens, a lamp, for example, will have its bulb socket sleeve energized rather than the little tab inside the socket.What happens if you reverse hot and neutral wires?
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.Why is it dangerous to connect the switch in the neutral wire?
Answer: if the switch is connected in the neutral wire it can be quite deceptive and dangerous for the user. As in the on position it will allow current to pass nd in off position no current passes through the switch.What happens if a switch is not grounded?
Going without a ground wire In many cases, especially in older houses with metal boxes, the metal box may be grounded even if you don't have a ground wire. When you screw the light switch in, it will make contact with the box, and as long as the box is grounded, it will pick up ground that way.Why does a neutral wire shock you?
With no load, there is no potential (voltage) on the neutral under normal circumstances. If you touch the neutral wire and there is a load on it, you may receive a shock depending on if you are grounded or not. Electricity has to have a place to go and is trying to get back to earth.What happens if you wire an outlet wrong?
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. The other wire doesn't get connected to the earth, and it's called the ungrounded conductor, or hot wire.Does it matter which neutral wire I use?
All of the neutral wires that are connected together should belong to a single circuit. You can generally tell if it is a single circuit if you only have to turn off 1 breaker. It doesn't matter which pair of neutrals and hots you use as long as they belong together on the same circuit. 
