MIGB

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Lets' start with why you're installing one in the first place? There are many variables and they're actually not required by the NEC very often. Having said that I see them installed all over the place when not required.
 
Hey Inf. Just came across this. I think you said in another post they are required when terminating conduit into a box with KO when the voltage id 277 or higher?
 
Alwayslearningelec said:
Hey Inf. Just came across this. I think you said in another post they are required when terminating conduit into a box with KO when the voltage id 277 or higher?
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I beleive I stated that when the raceway enters through a concentric or eccentric KO and the voltage is above 250 volts to ground a bonding bushing is required.
 
Usually just on one end. However there are situations where you would need one on each end. Follow the fault current: can it get back to the source without having to go thru a KO (for over 250v to ground) or a regular locknut (for supply side)? For example consider on the supply side of the service disconnect, a pull box nippled into a service disconnect cabinet. You could bond the pull box to the neutral, use a SSBJ from the pull box to the neutral bus in the service disconnect, or you could bond it with the nipple but you would need a MIGB on each end.
 
Excuse my ignorance - what is MIGB? I'm sure it isn't Molybdenum Inverse Grease Barbiturates......................:)
 
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