Engineering White Paper

Using VFDs on GFCI Devices

The National Electrical Code, or NEC, continues to expand protection requirements for safety reasons resulting in an increase in Ground-Fault Circuit-Interrupter (GFCI) outlets being used in more environments.  As a result, the Variable Frequency Drives (VFDs) industry is finding more instances of VFDs being powered from GFCIs. VFDs introduce high frequency harmonic content which may cause nuisance tripping on some GFCI devices.  This paper is intended to assist anyone that needs to use a VFD on a circuit with GFCI protection.  KB Electronics has developed special VFDs suitable for use with most GFCIs*.  

* Please contact KB Electronics with information regarding your specific GFCI.

Click here to download the white paper.

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