Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
If a motor on the drawing shows a homerun 3#12 & 1#12 ground or 3#8 & 1#10 ground is the ground wire needed. I though the conduit could be used as a ground? THanks.
Motor Grounds
- Thread starter Alwayslearningelec
- Start date
- Status
- Location
- Illinois
- Occupation
- retired electrician
You have to quote and install based on the design even where that design exceeds the minimum requirements of the NEC.
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Since you won't be connecting a solid raceway to the motor and flexibility is usually required then the raceway must contain a wire type EGC.
Rewire
Senior Member
- Location
- Lake of the Ozarks
If this is speced then you will need to insall it that way you can always ask for a change but you will probably have to give up money because of the reduction in cost. If you ever worked in an older factory you would not trust conduit as the ground path.
- Location
- Illinois
- Occupation
- retired electrician
You could just use an equipment bonding jumper around the flex and not have to install an EGC of the wire type in the complete raceway.
Rewire
Senior Member
- Location
- Lake of the Ozarks
But the Home run would usually land in a disconnect first or a starter so the HR if ran in metal conduit could drop the EGc.
Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
yes right....raceway to disconnect. THanks.
Alwayslearningelec
Senior Member
- Location
- NJ
- Occupation
- Estimator
Ahhh, ok!!!
- Location
- New Jersey
- Occupation
- Journeyman Electrician
I agree. And EGC in the raceway would be just one of many code compliant methods. A bonding jumper would be another. If FMC is used for flexibility some wire type of EGC/bonding jumper is required. I don't know of a readily available fitting that allows a bonding jumper to be installed around the outside of FMC.
- Location
- Illinois
- Occupation
- retired electrician
I am not aware of grounding connectors for FMC like they have for LFMC, but you can just use a clamp on the conduit and a connection to the motor with a lug.
As you said there are many ways to accomplish the code required grounding.
weressl
Esteemed Member
Flexible conduit COULD contain a grounding provision that will provide grounding continuity of the rigid conduit if connected with appropriate connectors on both end. External bonding jumper can also be used.
- Status