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When carrying out an insulation resistance test on a walloven with mineral insulated metal sheathed heating elements the minimum permitted insulation resistance is?
0.1M ohms
Why would never measure resistance in a circuit carrying a current?
If the circuit is carrying current then that means that the load (resistance) is in the circuit. if an ohm meter is connected in the live circuit then there would be some voltage drop at the ohm meter but as the meter has very less resistance, this would damage the instrument.
Why insulation is needed on current carrying conductors?
To prevent the wire from getting short circuited to ground or even to other wires.
What happens if wire insulation is weak?
Depending on the voltage potential that the wire is carrying, an insulation breakdown could lead to a short circuit. If this condition occurs then the circuits over current protection should trip the circuit off line.
How is the star and delta timer connector protected?
As are most current carrying components in a control panel, they are protected from grounding out by having insulation wrapped around them.
When carrying out an insulation resistance test on a walloven with mineral insulated metal sheathed heating elements the minimum permitted insulation resistance is?
0.1M ohms
Identify one item that needs to be disconnected prior to carrying out insulation resistance tests?
The voltage source needs to be disconnected prior to carrying out insulation resistance tests. Disconnect any electronic devices like Variable Frequency Drives, Soft Starters etc. These devices are likely to get damaged if meggar test is done keeping them in circuit.
What happens to insulation resistance when cable csa is halved?
When the cross-sectional area (CSA) of a cable is halved, its insulation resistance typically increases. This is because a smaller CSA can lead to a higher resistance in the conductive material, as resistance is inversely proportional to the area of the conductor. Additionally, the insulation material's properties and thickness remain constant, further contributing to higher overall insulation resistance. However, it's important to note that halving the CSA may also lead to increased heating and reduced current-carrying capacity, which can impact the cable's overall performance.
Does the insulation of wires affect its quality?
yes and no The problem is that the Word "Wire" refers to the both the metal core and the Wire as a conductor and insulation package. Another problem is what you mean by "quality". What definition are you using? The insulation is critical to determining the use and safety of a wire. The resistance of the metal wire is not affected by the insulation, but its ability to dissipate heat while carrying high current is.
What is effect of resistance in heat production in a current carrying conductor?
resistance will be high
Why would never measure resistance in a circuit carrying a current?
If the circuit is carrying current then that means that the load (resistance) is in the circuit. if an ohm meter is connected in the live circuit then there would be some voltage drop at the ohm meter but as the meter has very less resistance, this would damage the instrument.
Why do bare conductor carry more electrical load than insulated one?
Bare conductors carry more electrical load than insulated ones primarily because they have lower resistance and are not limited by the insulation material, which can add to the overall resistance and heat generation. The absence of insulation allows for better heat dissipation, enabling the conductor to handle higher currents without overheating. Additionally, bare conductors can be designed for higher current capacities, making them more efficient for carrying electrical loads.
Why insulation is needed on current carrying conductors?
To prevent the wire from getting short circuited to ground or even to other wires.
Do you can connect a multiplier resistance is series despite a shunt resistance in parallel in ammeter . and why?
An ammeter is connected in series in a branch of the circuit carrying current, and measures the current in that branch. The resistance of the meter must be very low ... ideally zero ... in order to avoid influencing the circuit when it's installed. If you intentionally insert a resistance in series with the meter, then inserting the meter in a circuit changes the current in that branch. In general, it's not acceptable for the act of measuring to change the quantity being measured, unless you are closely related to Werner Heisenberg..
Is it acceptable to use the flag as clothing decoration a receptacle for carrying important objects etc?
Presuming you mean "national" flag, no.
Why you Removal of lamps from lighting outlet points When carrying out an insulation resistance test on this installation?
I'm not sure exactly what you're asking, but it sounds like you are wanting to test for any potential weak spots in insulation which would allow for stray current to pass through. You would want to set the circuit so that it would be an open circuit, so that if it was truly an open circuit, no current would be flowing through the circuit, where if some breakdown in the insulation allowed for a current flow, then you would be able to detect it.
How do biotic potential and environmental resistance interact to determine carrying capacity?
The carrying capacity effects the interactions with environment just like the limiting factors effect interactions with environment.
