--- title: What is Shaft Grounding? | AEGIS® Blog | Bearing Currents description: Bearing Currents | News and articles about AEGIS® Shaft Grounding Rings and other elements of electric motor reliability. --- [![Electro Static Technology](https://blog.est-aegis.com/hubfs/raw_assets/public/public/images/electro-static-technology.svg "Electro Static Technology")](https://www.est-aegis.com/) [![Aegis](https://blog.est-aegis.com/hubfs/raw_assets/public/public/images/Aegis.svg "Aegis")](https://www.est-aegis.com/) - [+1 866-738-1857](tel:+1%20866-738-1857) - [Products](https://www.est-aegis.com/products/) - [AEGIS® SGR – for motors under 500 HP/375 kW](https://www.est-aegis.com/product/sgr/) - [AEGIS® uKIT – for common NEMA/IEC frame size](https://www.est-aegis.com/product/sgr-ukit/) - [AEGIS® RPPR – for reactor recirculating pumps](https://www.est-aegis.com/rppr-resources/) - [AEGIS® EV and EVO Rings - for electric vehicles](https://www.est-aegis.com/product/ev-evo-rings/) - [AEGIS® PRO Series – for motors over 300 HP/225 kW](https://www.est-aegis.com/product/pro-series/) - [Shaft Voltage Testing and Accessories](https://www.est-aegis.com/product/mounting-accessories/) - [Online Product Catalog](https://catalog.est-aegis.com/) - [AEGIS® 2-Year Extended Warranty](https://www.est-aegis.com/product/extended-warranty/) - [Applications](https://www.est-aegis.com/applications/) - [Electric Vehicle Solutions](https://www.est-aegis.com/applications/electric-vehicle-solutions/) - [Food & Beverage](https://www.est-aegis.com/applications/food-beverage/) - [HVAC](https://www.est-aegis.com/applications/hvac/) - [Industrial & Chemical](https://www.est-aegis.com/applications/industrial-chemical/) - [Other Industries](https://www.est-aegis.com/applications/other-industries/) - [Power Generation & Renewable Energy](https://www.est-aegis.com/applications/power-generation-renewable-energy/) - [Transportation](https://www.est-aegis.com/applications/transportation/) - [Water Treatment](https://www.est-aegis.com/applications/water-treatment/) - [Bearing Protection](https://www.est-aegis.com/bearing-protection/) - [Shaft Voltage & Bearing Currents](https://www.est-aegis.com/bearing-protection/shaft-voltage-and-bearing-currents/) - [Fluting & Bearing Inspection](https://www.est-aegis.com/bearing-protection/fluting-and-bearing-inspection/) - [Best Practices & Installation](https://www.est-aegis.com/bearing-protection/best-practices-and-installation/) - [Resources](https://www.est-aegis.com/resources/) - [AEGIS® Bearing Protection Handbook](https://www.est-aegis.com/resources/handbook/) - [IEEE-841, Hazardous Locations, & AEGIS®](https://info.est-aegis.com/technical-codes-and-ieee-841-standards) - [Recorded Webinars Library](https://www.est-aegis.com/resources/recorded-webinars/) - [Installation Instructions](https://www.est-aegis.com/resources/installation-instructions/) - [Videos](https://www.est-aegis.com/resources/videos/) - [Technical Papers](https://www.est-aegis.com/resources/technical-papers/) - [Case Studies](https://www.est-aegis.com/resources/case-studies/) - [Specifying AEGIS®](https://www.est-aegis.com/resources/specifying-aegis/) - [Request Training](https://www.est-aegis.com/resources/training/) - [Product Sheets](https://www.est-aegis.com/resources/product-sheets/) - [About](https://www.est-aegis.com/about/) - [News](https://blog.est-aegis.com/) - [Tradeshows](https://www.est-aegis.com/about/tradeshows/) - [Blog](https://blog.est-aegis.com/) - [Where to Buy](https://www.est-aegis.com/where-to-buy/) - [Distributors](https://www.est-aegis.com/where-to-buy/distributors?type=Distributor) - [Trained Installers](https://www.est-aegis.com/where-to-buy/installers?type=Installer) - [Explosion Proof Installers](https://www.est-aegis.com/where-to-buy/installers?type=Explosion%20Proof%20Installer) - [Motors & Seals with AEGIS® Installed](https://www.est-aegis.com/where-to-buy/oems-with-aegis/) [Contact Us](https://www.est-aegis.com/contact/) - [+1 866-738-1857](tel:+1%20866-738-1857) ## Posts about Bearing Currents:     [Home](https://www.est-aegis.com/) » Blog #   Blog [![Protect Against Circulating Current](https://blog.est-aegis.com/hs-fs/hubfs/circ-current-simple.png?width=365&name=circ-current-simple.png)](https://blog.est-aegis.com/why-cant-you-prevent-circulating-current-damage-with-two-aegis-rings?hsLang=en-us) ## [Why Not Use Two AEGIS Rings to Protect Against Circulating Current?](https://blog.est-aegis.com/why-cant-you-prevent-circulating-current-damage-with-two-aegis-rings?hsLang=en-us) For large motors on drives (over 100 HP/75kW), we recommend an AEGIS® Shaft Grounding Ring at one... [Read More](https://blog.est-aegis.com/why-cant-you-prevent-circulating-current-damage-with-two-aegis-rings?hsLang=en-us) [![spark gap transmitters](https://blog.est-aegis.com/hs-fs/hubfs/spark_emit.png?width=365&name=spark_emit.png)](https://blog.est-aegis.com/detecting-bearing-current-other-methods?hsLang=en-us) ## [Detecting Bearing Current: Other Methods](https://blog.est-aegis.com/detecting-bearing-current-other-methods?hsLang=en-us) In our last post, we looked at how shaft voltage testing can be used to detect stray current arcing... [Read More](https://blog.est-aegis.com/detecting-bearing-current-other-methods?hsLang=en-us) [![Bearing current chart](https://blog.est-aegis.com/hs-fs/hubfs/cmv-vs-disch-2us.png?width=365&name=cmv-vs-disch-2us.png)](https://blog.est-aegis.com/detecting-bearing-current-with-shaft-voltage-testing?hsLang=en-us) ## [Detecting Bearing Current with Shaft Voltage Testing](https://blog.est-aegis.com/detecting-bearing-current-with-shaft-voltage-testing?hsLang=en-us) Electric motors controlled by drives are at risk of destructive bearing currents causing premature... [Read More](https://blog.est-aegis.com/detecting-bearing-current-with-shaft-voltage-testing?hsLang=en-us) [![preventing downtime in paper mills](https://blog.est-aegis.com/hs-fs/hubfs/Imported_Blog_Media/Large-Paper-Roll.jpg?width=365&name=Large-Paper-Roll.jpg)](https://blog.est-aegis.com/electrical-bearing-protection-in-pulp-paper-mills?hsLang=en-us) ## [Electrical Bearing Protection in Pulp and Paper Mills](https://blog.est-aegis.com/electrical-bearing-protection-in-pulp-paper-mills?hsLang=en-us) The [pulp and paper industry](https://www.est-aegis.com/applications/industrial-chemical/)is a vital sector of the global economy and produces essential... [Read More](https://blog.est-aegis.com/electrical-bearing-protection-in-pulp-paper-mills?hsLang=en-us) [![Mining cars in a precious metal mine](https://blog.est-aegis.com/hs-fs/hubfs/minecarts_dreamstime_s_52427722.jpg?width=365&name=minecarts_dreamstime_s_52427722.jpg)](https://blog.est-aegis.com/variable-frequency-drives-in-mining?hsLang=en-us) ## [Variable Frequency Drives in Mining](https://blog.est-aegis.com/variable-frequency-drives-in-mining?hsLang=en-us) Mining has been vital to civilization since at least the Bronze Age. In today’s electrified world,... [Read More](https://blog.est-aegis.com/variable-frequency-drives-in-mining?hsLang=en-us) [![AEGIS rings being installed on pump motors ](https://blog.est-aegis.com/hs-fs/hubfs/Imported_Blog_Media/blueash-21-300x225.jpg?width=365&name=blueash-21-300x225.jpg)](https://blog.est-aegis.com/pumping-systems-on-vfd-need-bearing-protection?hsLang=en-us) ## [Pumping Systems on VFD Need Bearing Protection](https://blog.est-aegis.com/pumping-systems-on-vfd-need-bearing-protection?hsLang=en-us) In most pump applications, running the pump at full speed is not always necessary. Flow rate has... [Read More](https://blog.est-aegis.com/pumping-systems-on-vfd-need-bearing-protection?hsLang=en-us) [![three types of bearing current ](https://blog.est-aegis.com/hs-fs/hubfs/best-practice.png?width=365&name=best-practice.png)](https://blog.est-aegis.com/three-types-of-bearing-current-mitigation?hsLang=en-us) ## [Three Types of Bearing Current: Mitigation](https://blog.est-aegis.com/three-types-of-bearing-current-mitigation?hsLang=en-us) [Read More](https://blog.est-aegis.com/three-types-of-bearing-current-mitigation?hsLang=en-us) [![bearing current](https://blog.est-aegis.com/hs-fs/hubfs/Imported_Blog_Media/phase-vi-300x217-1.png?width=365&name=phase-vi-300x217-1.png)](https://blog.est-aegis.com/three-types-of-bearing-current?hsLang=en-us) ## [Three Types of Bearing Current: Causes](https://blog.est-aegis.com/three-types-of-bearing-current?hsLang=en-us) [Read More](https://blog.est-aegis.com/three-types-of-bearing-current?hsLang=en-us) [![Comparison of 20 Year TCO](https://blog.est-aegis.com/hs-fs/hubfs/fluted%20bearing.png?width=365&name=fluted%20bearing.png)](https://blog.est-aegis.com/five-most-common-causes-bearing-failure?hsLang=en-us) ## [The Five Most Common Causes of Bearing Failure](https://blog.est-aegis.com/five-most-common-causes-bearing-failure?hsLang=en-us) Although we talk in this blog mainly about[electrical bearing](https://www.est-aegis.com/products/)damage, there are plenty of other... 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