A Vernier caliper, or a micrometer can measure diameter real well, and from that it's easy to calculate area.
To measure the size of a chain link, you can use a ruler or caliper to measure the length and width of the link. The size is typically given in terms of the diameter of the wire used to make the link.
To measure the thickness of a thin piece of wire we have got the instrument called the wire gauge. The thickness of a thin piece of wire is measured in mm.
Megger is related to a hot wire instrument with a moving coil. The megger uses a moving coil to measure insulation resistance in electrical circuits and equipment. This type of instrument is specifically designed for insulation testing.
The frequency has no direct relationship to the size of wire. Wire is sized as to the amount of current a load draws in a circuit.
Each size of wire is rated for a specific amount of current that can safely pass through it. If large amperage capacities were to pass through a small size wire, the amperage would create heat and the wire would melt.
Not if it is secured and tightened properly and has the correct size breaker installed for the wire size used.
For accommodating 4/3 wire, a 1-inch conduit size should be used.
The ohmmeter is usually used to measure the resistance of a given wire only.
The minimum size wire that engineers spec for industrial and commercial installations is #12 and it usually is stranded not solid wire.
For a 100 amp service in copper, a wire size of 3/0 AWG should be used.
For a 100 amp breaker, a wire size of 2 AWG (American Wire Gauge) should be used to ensure proper electrical safety and performance.
For a 50 amp breaker, a wire size of at least 6 AWG (American Wire Gauge) should be used to safely handle the electrical load.