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The full circuit voltage
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What is the Voltage drop across a good fuse?
The voltage drop across a good fuse is very nearly zero, under nominal current conditions. The voltage is not exactly zero because you do want the fuse to have some resistance in order to develop enough voltage drop and dissipated power under fault conditions to blow.
What is the difference between 125V 15A fuse and 230V 15A fuse?
The voltage rating of a fuse (in this case 125V or 230V) defines the maximum circuit voltage that the fuse is safe to be used on. A fuse with a voltage rating of 125V should not be used in a circuit with a voltage greater than 125V. If a 125V fuse were installed in a 230V circuit and an overload current occurred, the fuse could explode.
How is low voltage circuit normally protected?
If it is then it has a 3 or 5 amp fuse. Some are not.
Is a 10 ampere fuse suitable for 240 volt?
Yes a 10 amp fuse can be used to protect a 240 volt circuit. The amperage rating of a fuse is based on the given amperage load of the circuit. The voltage rating on a fuse must match or be higher than the voltage that is applied to the fuse. In other words you can not use a 240 volt fuse on a 277, 347, 480 or 600 volt circuit but it can be used on a 120 volt, Manufactures of switching equipment today make it impossible to interchange different voltage fuses to be installed in higher voltage switches.
Will the supply company allow you to install a double pole isolator switch between the cut out fuse and the consumer unit and if so where can you buy one?
No, the supply company will not allow anyone to install a double pole isolator switch between the cut out fuse and the consumer unit. This is the utility company's primary voltage line. The only people that are allowed to work on their equipment is their own employees. These people are trained linemen who know and respect high voltage and know all of the safety procedures to adhere to.
If the head lights on a 1987 Nissan 300 ZX stopped rolling up or down should you check the fuses?
Get a multi-meter and check for power at the motor that moves the lights up and down. If there is 12V, your motor is shot. If there isn't 12V then it could be a fuse. Use your multi-meter again to check for voltage across the fuse. If there is 12V across the fuse, the fuse is blown. If there is virtually no voltage measured across the fuse, the fuse is good. You might have other problems. Good luck.
What is the Voltage drop across a good fuse?
The voltage drop across a good fuse is very nearly zero, under nominal current conditions. The voltage is not exactly zero because you do want the fuse to have some resistance in order to develop enough voltage drop and dissipated power under fault conditions to blow.
If the function range switch is set at 200 vac what will the multimeter read if a measurement is made directly across both terminals of a blown fuse in a 120 vac line?
With the meter on the voltage scale you will read zero volts across the blown fuse. From the bottom terminal of the service switch fuse to ground you will read zero volts and from the top terminal of the service switch fuse to ground you will read 120 volts. The multimeter will read 0
When do circuits not light up?
When there is no supply voltage or a switch is open or a fuse has blown to name a few.
Where is the relay switch for the head lights located on a 1992 Pontiac Firebird?
There is no relay. The voltage comes from the fuse box directly to the headlight switch.
Why use a fuse switch as well as a circuit breaker?
Because a fuse is more reliable in the case of an auto mobile but not anywhere with extricable high voltage.
How do you tell if your tail light fuse is blown?
When an electrical circuit in a car fails, the most likely reason is a blown fuse. The owner's manual will contain a diagram of the different fuses, each circuit identified. Identifying the possible fuse, from the manual, and then looking at the fuses physically, will most likely show which fuse is involved. There is also likely, a fuse diagram within the fuse box showing where each fuse is. The fuse needs to be visually inspected. Good fuses will show a shiny metal link on top. Blown fuses will show a dark gap. Sometimes, you need to pull the fuse out of the socket and look at it through the light. You can then see the broken link clearly. Another method of finding blown fuses is by using a volt meter. Normally, the voltage across a fuse is trivial, but when a fuse has blown, the voltage across it will be around 13 volts. This is because the circuit has been broken and the full battery voltage is across it. For a tail light, the lights need to be turned on when checking the voltage across the fuse.
What is the standard ampere rating for fuse?
Because too high a voltage could arc across the fuse or could cause fuse to fail in other ways not related to normal operation.
If you attempted to read the voltage across a car battery with the multimeter accidentally in ammeter mode?
A multimeter when used on voltage, has a very high resistance/impedance to limit the current flowing through it. However when you set it to read current, it has a very small resistance to encourage the current to flow through the metre so can be measured. So ig you put a multimeter across a voltage source (in parrallel) when its set to current, you will normally destroy the metre. Although more expensive metres will have a fuse to protect the instrument should this occur. Hope this helps Always switch back, should you do this on the mains, you can quite easily set the metre on fire!! CB Eng
What happens when using a 240 volt fuses on a 480 volt 3-phase system?
The voltage rating of a fuse has to do with how long the fuse is / how much dielectric strength exists between the two terminals that don't melt. If you use a fuse that is rated for too low of a voltage, it will likely melt for a fault condition, but the voltage is too high for the gap distance, so an arc will develop across the (open) fuse. So...the fuse does no good. It will not protect equipment if used at a higher voltage than it is rated.
Can you use normal AC fuse link in DC supply?
yes, but you must derate the voltage as DC arc across blown fuse is not self quenching as is AC arc.
How many volts in 30amps?
All fuses have a voltage rating, which is independent of its current rating. The current rating is the maximum current the fuse will pass; any higher, and it will blow. The voltage rating is the maximum voltage that is allowed to appear across the fuse should it blow. If the voltage is any higher than the fuse manufacturer's rating, it may arc across inside the fuse, causing power to continue to be supplied to the faulty item that caused the fuse to blow in the first place. This is obviously very dangerous, and could result in severe electric shock, or fires. The voltage rating is usually stamped on one end of the fuse.
