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Is 200Mohms an acceptable result when carrying out an insulation resistance live-live test on a shower block?
Wiki User
∙ 10y ago
If you have 200 megohms on an insulation test of a conductor it is more than enough to feel safe about applying a voltage to the conductor with out it shorting to ground.
Wiki User
∙ 10y ago
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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.
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
What stabilizes a population and its carrying capacity?
environmental resistance
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 current carrying wires become hot?
Resistance. Need larger gage wire
Why insulation is needed on current carrying conductors?
To prevent the wire from getting short circuited to ground or even to other wires.
Why human body has more resistance than metal?
Human body has more resistance than metal because it has less conductor for carrying electrons.
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.
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..
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.
