technical brief - grounding washer installation for ...grounding washer installation for enphase...

TECHNICAL BRIEF Copyright © 2012 Enphase Energy November 1, 2012 1 Grounding Washer Installation for Enphase Microinverters Introduction Enphase’s M215 and D380 microinverters are provided with an equipment grounding conductor in their AC cabling systems. While it is desirable to securely, electrically bond the various non current carrying elements in a photovoltaic system (racking, module frames and microinverter case), use of traditional wire connectors and jumpers is costly and labor intensive to install and aesthetically unattractive. Wiley “WEEB” grounding washers provide a cost effective, less labor intensive and effectively invisible grounding and bonding method. This document provides the installation procedure and torque specifications. The Enphase compatible racking models that have listed grounding washers available are included on the last page of this document. Enphase’s M190 and M210 require a separate equipment grounding conductor. Wiley “WEEB” grounding washers provide the same function and benefits for equipment grounding as they do for bonding. Installation Procedure The Enphase Microinverter model D380 is shown. The installation procedure and grounding washer model numbers also apply to the Enphase Microinverter models M215, M210 and M190. 1. Install a minimum of one grounding washer per microinverter. 2. Each microinverter requires a stainless steel fender washer on the topside of the mounting bracket for the bolt that passes through the grounding washer. 3. Torque the microinverter fasteners to the values listed (minimum torque requirements). Wiley and the racking manufacturers will have specific torque specifications in their installation documents. We recommend using the highest of these values. • 1/4” mounting hardware – 45 in-lbs minimum • 5/16” mounting hardware – 80 in-lbs minimum

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TECHNICAL BRIEF

Grounding Washer Installation for Enphase Microinverters

Introduction Enphase’s M215 and D380 microinverters are provided with an equipment grounding conductor in their AC cabling systems. While it is desirable to securely, electrically bond the various non current carrying elements in a photovoltaic system (racking, module frames and microinverter case), use of traditional wire connectors and jumpers is costly and labor intensive to install and aesthetically unattractive. Wiley “WEEB” grounding washers provide a cost effective, less labor intensive and effectively invisible grounding and bonding method. This document provides the installation procedure and torque specifications. The Enphase compatible racking models that have listed grounding washers available are included on the last page of this document. Enphase’s M190 and M210 require a separate equipment grounding conductor. Wiley “WEEB” grounding washers provide the same function and benefits for equipment grounding as they do for bonding.

Installation Procedure The Enphase Microinverter model D380 is shown. The installation procedure and grounding washer model numbers also apply to the Enphase Microinverter models M215, M210 and M190.

1. Install a minimum of one

grounding washer per microinverter.

2. Each microinverter requires a stainless steel fender washer on the topside of the mounting bracket for the bolt that passes through the grounding washer.

3. Torque the microinverter fasteners to the values listed (minimum torque requirements). Wiley and the racking manufacturers will have specific torque specifications in their installation documents. We recommend using the highest of these values.

• 1/4” mounting hardware – 45 in-lbs minimum • 5/16” mounting hardware – 80 in-lbs minimum