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The formal designation and full title for this standard that was published in April 2020 is, “CSA C392:20 Testing of Three-Phase Squirrel Cage Motors During Refurbishment.” This is the second edition of the standard and supersedes the previous edition published in 2011. The standard focuses on the identification of those tests that help to determine whether the efficiency of a motor is maintained after it is “refurbished,” without requiring a motor efficiency test.

The detailed descriptions of the tests to be performed make this standard very useful as a reference and a how-to document for any service center, not just those in Canada.

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When having trouble drying a winding after a bake cycle, heat the windings to between 230°F (110°C) and 300°F (150°C). Transfer the hot windings to the VPI tank and draw a vacuum. Hold the vacuum for a few hours to draw out any residual moisture that may be trapped within the insulation. To expedite the cooling process, use dry air or nitrogen to return the autoclave to atmospheric pressure. If the winding doesn’t pass electrical tests after this process, moisture most likely isn’t the issue.

• When it is necessary to work on a live circuit of 220 volts AC and over, always wear rubber gloves and stand on a rubber mat if practical.
• Do not depend on insulated tool handles when working on “hot” lines. Use rubber gloves, mats and other safety devices as required by shop safety procedures.
• Do not use metal ladders or ladders made with conductive materials when working on or near live electrical lines.