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It depends on the surround material, temperature, type of cable, and what you mean by "maximum current rating". Typically a maximum load current rating will be specified, such as 15A; this means you can push 15A through that cable nonstop without damaging it (it won't overheat). You might have a short time rating as well, such as a 4 hour rating, where the cable can handle runing 22A for 4 hours if the surrounding temperature is kept to some value, though this may slightly degrade the insulation. There's also a fusing current rating for many cables. At this current, the cable will eventually melt (like a fuse).
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What will happen if i connect a power supply of higher current rating to lower current load?
The supply won't have to work as hard. It is perfectly acceptable, for example, to use a 1A, 12v supply to supply a 12v, .5A load. The current rating indicates the ability of the supply to dissipate heat caused by the current flowing. If the load current is above the power supply current rating, the power supply will overheat.
What will happens to current when cable length increases?
With a constant voltage and increase in wire length will increase the end to end resistance and therefore the current will decrease.
What is the Electrical circuit breaker making and making capacity?
making current is a peak value attain at first cycle when the circuit breaker is close.the making current rating is expressed in "peak" value of the maximum ac current it can safely close on that's why it is always have higher value than breaking current. Making current is limited by the withstand capability of the contacts. Breaking current is based on the ability of the contacts to interrupt the current. If the contacts are not able to interrupt the current when they open, the heat energy in the resulting arc will often destroy the device. the breaking current rating is expressed in RMS value of the current.
What are the advantages Pvc Single Core Cables?
A single-core cable generally has a higher current rating because it can be separated from neighbouring cables to allow any heat generated to escape. However if power cables continuously run warm it is a sign that they are being run uneconomically and the use of a thicker wire gauge is indicated, because the extra capital costs of a thicker cable would be more than offset by the saving on the cost of the energy wasted in heating the cable.
How are current ratings given to a resistor?
Resistors are not usually given 'current ratings' but, rather, 'power ratings' expressed in submultiples of the watt. It is then up to the user to calculate the safe maximum operating current for a particular resistor, by manipulating the equation: P = I2 R.Since a power rating is dependent upon the resistor's ability to dissipate energy by heat transfer, the actual power rating is dependent upon the surface area and, hence, the physical size of the resistor. So you will find that resistors come in a variety of physical sizes for any given resistance value.Unfortunately, power ratings are not indicated through colour codes, etc., so you will have to either specify its power rating when you purchase a resistor, or match your existing resistor against a scale-drawing to determine its power rating.
What will happen if i connect a power supply of higher current rating to lower current load?
The supply won't have to work as hard. It is perfectly acceptable, for example, to use a 1A, 12v supply to supply a 12v, .5A load. The current rating indicates the ability of the supply to dissipate heat caused by the current flowing. If the load current is above the power supply current rating, the power supply will overheat.
What will happens to current when cable length increases?
With a constant voltage and increase in wire length will increase the end to end resistance and therefore the current will decrease.
Why are conductors needed?
If you want to operate the conductors maximum capacity, the conductor needs the heat, that the amperage produces, to be dissipated. This is why in the electrical code book there are two amperage ratings. The first one is for a free air rating which allows for a high ampacity of the wire. The other rating is for three conductors in a conduit which confines the cooling capacity and so the ampacity rating of these wires is lowered. The same procedure is used in cable spacings in ladder tray networks.
Why Cable gets heated when current flows more than its rated current why?
Because if the rated current is lower than the actual current, it causes resistance to the electrical flow which in turn is dispelled as heat.
What is the difference between an electric cooker cable and a bulb cable?
The electric cooker cable is made thicker because it has to carry more current. If it were too thin it would heat up and perhaps melt.
What is the Electrical circuit breaker making and making capacity?
making current is a peak value attain at first cycle when the circuit breaker is close.the making current rating is expressed in "peak" value of the maximum ac current it can safely close on that's why it is always have higher value than breaking current. Making current is limited by the withstand capability of the contacts. Breaking current is based on the ability of the contacts to interrupt the current. If the contacts are not able to interrupt the current when they open, the heat energy in the resulting arc will often destroy the device. the breaking current rating is expressed in RMS value of the current.
What would cause positive battery cable to get hot?
If this cable is very thin, then it can not withstand the current that go through it. Too high current make cable go hot. A car battery can give out 100 ampere easily for a short period of time. If you attach "heavy" equipment, then cables will heat up. Another source of heat is a bad connection.
I Have two storage heaters where when being used the pole switch switch becomes warm hot is this normal?
A switch becoming hot is not normal. The cause could be loose connections where the wires join the switches terminal points. This could be the cause of the heat being generated. Misalignment of the switch blades inside the switch can also cause the heat to appear. Another cause could be that the heater loads are higher that the amp rating of the switch. Switches have a label on the side of them rating what the current carrying capacity of the switch is and what the maximum amount of current that the switch can legally tolerate.
Why is it necessary to derate cables when installed in a duct?
Heat cannot escape the duct as easily as in open air. This results in the same amount of current causing the cable to heat to a higher temperature.
What are the ratings and certificates for Dead Heat - 2002?
Dead Heat - 2002 is rated/received certificates of: Argentina:16 Australia:MA (cable rating) Finland:K-15 Germany:12 South Korea:15 UK:15 USA:R
What does 100ma mean on an ac dc adaptor?
100 ma is equal to .1 amp. It is the capacity or the maximum amount of current that can be drawn from the adapter that is established by the manufacturer of the adapter. If more that the nameplate rating is drawn from the adapter it will start to heat up and if this overload is left on for a extended period of time the adapter will be destroyed because of the heat build up. The insulation on the windings breaks down under heat and eventually will short out making the adapter useless.
What are the advantages Pvc Single Core Cables?
A single-core cable generally has a higher current rating because it can be separated from neighbouring cables to allow any heat generated to escape. However if power cables continuously run warm it is a sign that they are being run uneconomically and the use of a thicker wire gauge is indicated, because the extra capital costs of a thicker cable would be more than offset by the saving on the cost of the energy wasted in heating the cable.
