LFMC bonding

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wireday

Senior Member
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New England
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Master electrician
Metal box on one end 5 feet to plastic thermostat box. EGC run inside LFMC, thermostat itself has a grounding connection. Is it OK to just ground one end of LFMC on metal box end?
 
Fred B said:
Are you asking to use the LFMC and an EGC? Or just for bonding purposes of the LFMC?
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Sounds like he has a wire type EGC in the flex and wants to know if the LFMC needs to bonded to the EGC at both ends. The end with the metal box is bonded by the connector the end in the plastic box is not bonded.
 
infinity said:
Sounds like he has a wire type EGC in the flex and wants to know if the LFMC needs to bonded to the EGC at both ends. The end with the metal box is bonded by the connector the end in the plastic box is not bonded.
Click to expand...
If the correct connector is used on the metal box end and proper bonding of the box is done, don't think any further bonding required depending on the box type. But if reference to the 5ft length and thinking is to use the LFMC as the EGC, the presence of the nonmetalic box precludes that purpose.
Either way must meet requirements found in 250.118 (NEC 2017)
 
infinity said:
Sounds like he has a wire type EGC in the flex and wants to know if the LFMC needs to bonded to the EGC at both ends. The end with the metal box is bonded by the connector the end in the plastic box is not bonded.
Click to expand...
Yes that is what I am asking,
 
Fred B said:
If the correct connector is used on the metal box end and proper bonding of the box is done, don't think any further bonding required depending on the box type. But if reference to the 5ft length and thinking is to use the LFMC as the EGC, the presence of the nonmetalic box precludes that purpose.
Either way must meet requirements found in 250.118 (NEC 2017)
Click to expand...
Not using LFMC as a ground, I have a GEC inside the LFMC, thanks
 
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