we have a 1200a 277480v sub panel h1 section 1 and 2. Section 1 is main for section 2. due to their close proximity we want to use flex conduit. is it required to bond the both ends of flex with bonding bushings ? if so do i use table 250.122 for jumper or is not even required?
1200a panels
- Thread starter mannyb
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- New Jersey
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- Journeyman Electrician
You'll need a wire type EGC with the feeder in the FMC. If there are no concentric or eccentric KO's then no bonding bushings required.
when would you say a bonding bushing is needed? I know with concentric and ecentric and service entrance conductors but what other reason you would need.? I always hear different requirements for bonding bushings and locknuts
- Location
- New Jersey
- Occupation
- Journeyman Electrician
Since you're over 250 volts to ground with your feeder you'll only need them with concentric and eccentric KO's and FMC. For a service raceway that contains SEC's you need to bond one end of the raceway with something beyond a standard locknut, could be a bonding bushing or bonding locknut if there are no concentric or eccentric KO's. Since large size FMC does not qualify as an EGC you'll need a wire type EGC run with the feeder.
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