For, example, “size 11” mean the mounting face of the motor is 1.1 inches square NEMA sets standards for many electrical products, including motors. NEMA National Electrical Manufacturers Association IEEE Std 43-2000IEEE Recommended Practice for Testing Insulation Resistance of Rotating Machinery This test is non- destructive providing that it does not fail and is usually required by safety agencies to be performed as a 100% production line test on all products before they leave the factory. The leakage current must be below a preset limit or the test is considered to have failed. A standard test voltage is applied (below the established Breakdown Voltage) and the resulting leakage current is monitored. This test allows designers to estimate the breakdown voltage of a product’s design and to see where the breakdown occurred.ĭielectric Withstand Test. The dielectric is often destroyed by this test so this test is used on a random sample basis. The test voltage is increased until the dielectric fails, or breaks down, allowing too much current to flow. Usually, lower the insulation resistance, it is more likely that there is a problem with the insulation.
Ideally, this resistance should be infinite. Insulation Resistance test measures the resistance of the electrical insulation between the copper conductors and the core of the stator. These three tests differ in the amount of voltage applied and the amount (or nature) of acceptable current flow: Three types of High Potential Test tests are commonly used.
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