Can a bond bushing replace an EGC in an electrical update?

infinity said:
Certainly in a steel frame building there are hundreds of parallel paths with the EGC so your point is valid. In 40 years in the trade I have seen an evolution in the thinking about this.

When I started in the 80's you never saw a green wire in any raceway. Even with 3/4" FMC we never installed a wire type EGC (old NYC electrical code). Then in the late 90's-2010's we were pulling in EGC's and IG's everywhere, often a separate EGC for every branch circuit even in a common raceway. Fast forward to 2015 and beyond we stopped pulling them in because someone started to realize (per electro's point) that they were a waste of money in steel framed construction or where you had large racks of conduits all connected together every 6' with a piece of strut. The last big high rise building I worked in they had an odd idea where they specified that only raceways for emergency circuits got a wire type EGC.
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Yes it really is quite fascinating how all this has evolved.
 
ggunn said:
FWIW, I always specify a wire EGC. Every joint/connection in a conduit run is a potential point of failure.
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Here they started specifying green wire after the MGM grand fire in Nevada circa 1980, when it was understood from the forensics the fire was caused by a 3/4 metal flex that had come loose or was never installed properly that caused a breaker to fail to trip properly.
I do agree the green wire can be omitted in the case of the OP (perhaps test the raceway) and with large pipe racks, but some redundancy is good.
 
tortuga said:
I do agree the green wire can be omitted in the case of the OP (perhaps test the raceway) and with large pipe racks, but some redundancy is good.
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Yeah sometimes even I will admit its a good idea. Like maybe on roof tops with smaller diameter and/or a small quantity of EMT where you are out in the elements and they are just sitting on dura blocks getting kicked around.....But cult members think every single installation needs a wire or everyone in a half mile radius will die a horrlbe grusome fiery death.
 
While I normally do not use a wire EGC in metal unless required, I did when I ran a 30a, 120/240v feeder to an outbuilding in RGS due to rocky conditions. I figured that the conduit will slowly disappear.
 
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