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Engineers that I have worked with state in their specifications that all meggered wires must have a reading of 5 Meg ohms or higher. If the reading is lower that this benchmark start checking splices especially if it is an underground installation. Water usually accumulates in underground conduit systems and when the wires are pulled in there is a certain amount of conductor scraping. This starts the downward spiral from infinity. Check termination points close to the exit point of the conduit. A certain amount of evaporation from the conduit condensates on the terminal points.
What else can I help you with?
Can you use ohm-meter to measure a resistance between the neutral line N and the ground E?
If the meter is sensitive enough and there is a resistance between the neutral and ground then the meter should be able to detect it.
How do you earth in the 1600 kva transformer?
In 1600 kva transformer we provide NGR (Neutral grounding resistance)
Can you use HT cable in place of Lt cable?
For LT cable 1. Use : Up to 690V 2. Insulation : PVC 3. Core(Neutral) : Yes 4. Insulation Grading : 1100 V For HT cable 1. Use : Above 690 2. Insulation : XLPE 3. Core(Neutral) : No 4. Insulation Grading : Above 3.3kV, 11KV..etc ( Please note that now 690 V using in VFD application with LV cable and 440 V for DOT motor starter) from Kunal Singh Dabi the_dabi@rediffmaill.com
How can you do the polarity test of a switch?
A 'polarity test', as it applies to a switch, is performed to confirm that the switch is located in the line conductor and not in the neutral conductor.
How calculate the leakage of the capacitor?
leakage current can be determine through the use of clampmeter or ohm-meter. leakage current can be determine through the use of clampmeter or ohm-meter. You can use Ohm's law (E=IR) to get this answer. Disconnect power to the circuit, and measure the leakage path's resistance (This is usually the rated resistance of the insulating material...you will need a M-ohmmeter to measure insulation resistance, as it will be MUCH higher than a standard ohmmeter can measure). Then rework the formula to solve for current: I=E/R or simply: divide voltage by resistance. You can also use an inductive current clamp as mentioned above. This clamp measures electrical current by measuring the electromagnetic field strength of the current flowing through the wire.
Can you use ohm-meter to measure a resistance between the neutral line N and the ground E?
If the meter is sensitive enough and there is a resistance between the neutral and ground then the meter should be able to detect it.
How neutral brings the power to the source?
By creating a loop of equal resistance
What is the reason why the neutral is not used on high resistance grounding?
The question doesn't provide enough detail to give a definitive answer. The neutral PD is often used in protective functions on high resistance grounded generators (when grounded through a transformer). High resistance grounding limits the use of transformers - you must be using balanced loads, since very little current will flow (typically around 5-20amperes max) to the neutral. Because of this, phase to neutral values (such as voltage) are meaningless. Any current flowing in the neutral will cause an offset in all three phases from neutral. Since the neutral is high resistance grounded, it does not take a significant amount of current to cause significant offset.
Which is hot ribbed wire or smooth wire?
In North America the neutral has to be identified as such. On a lamp cord the ribbed insulation side is the identification of the neutral wire. The "hot" conductor of the lamp cord is the smooth insulation.No. Screw material is no safe indicator because they would be too easy to swap round.
When phase and neutral will short means what will be the voltage in neutral?
If the phase and neutral wires are shorted together, the voltage in the neutral wire will be the same as the phase voltage. This is because the short circuit effectively bypasses any impedance or resistance in the circuit, causing the potential difference between the phase and neutral wires to be equal.
How do you earth in the 1600 kva transformer?
In 1600 kva transformer we provide NGR (Neutral grounding resistance)
What size neutral conductor for 100 amp panel?
For a 100 amp panel, a #4 copper or #2 aluminum conductor would typically be used as a neutral conductor. It's important to consult local electrical codes or a licensed electrician to ensure compliance with regulations and safety standards.
What is the problem when some house lights are bright and others dim?
Check the neutral connections. An open neutral or a high resistance neutral can cause this type of condition. The obvious place to start your search is in the switch boxes that connects to the light fixture.
Why does a 3 pin plug have big ground pin?
Resistance =pl/a where a is "area". And area is directly propotional to lenght and thickness. so if the area is greater mean resistance is less. and resistance is inversly proptional to current. so it will act as low resistance path for neutral current.
How do you reduce neutral and earth voltage up to 0 volts?
If you are reading a voltage it is the drop across the resistance to ground. To get rid of the voltage get the resistance lower. This can be accomplished by installing more ground rods to the grounding system. Utility companies usually like 3 ohms to ground or less.
Why neutral of generator is resistance grounded and neutral of motor is reactance grounded?
You can use resistance or reactance grounding on generators and motors. My understanding is resistance grounding is often used to limit ground fault currents to a few amperes, while reactance grounding will limit fault current to less than the three phase fault current. If reactance grounding is used to limit fault current o very little (like resistance grounding), transient overvoltage problems can occur.
Can a ground wire be connected to the white neutral in Clearwater Florida if no ground wire ia available?
Yes, if there in no ground wire that is acceptable on a home with no ground wires.
