Some tables help out even further by listing the resistance per standard length for wires of all gauges. In the case of 3-wire motors, winding resistance is measured for both the start and run windings.
If a winding shorts out due to an insulation fault the resistance should decrease further. However, an entire cable containing hot and neutral conductors cannot be measured this way.
Take readings at accessible points including disconnect s , the motor controller, any fuses or junction boxes, and so on, back to the over-current device output at the entrance panel. Nameplate reads 60Hz, but supply is 50Hz.
Touch the black negative lead of the multimeter to the negative end of the wire windings around the motor. Some tools have double-pole devices that switch off both the white and black.
In a motor solenoid, the wire is wrapped multiple times around a core, so to calculate its length, you need two pieces of information: Compare the reading to documented or nameplate specifications.
Copyright 2019 Leaf Group Ltd. About the Author William Hirsch started writing during graduate school in 2005. With the unit plugged in there was 122 volts between the ground and the black and also between the ground and the white.
This is especially true if there is ambient moisture or the motor has been unused for a while. See how to measure insulation resistance of Electric Motor Running Amps Test With the motor running, check the full load amps FLA with a suitable meter or preferably a clamp on meter and compare with the name plate FLA. Share this: The wire need not be centered in the opening and it is OK if it passes through at an angle. This can be done at the motor, at the well head, or even at the pressure switch.
For example, the diameter of 16-gauge wire is 1. The capacitor checked out OK. Sysem Expert Member Jun 4, 2011. Look out for smooth and free shaft rotation.