GEC passing thru grounding bushing

[gsstaley@sbcglobal.net]

Why can't the GEC pass thru a grounding bushing before landing on the neutral bar in my service panel? In my MH- understanding the NEC 2020, there is no graphic showing this, only a 2nd conductor from the neutral bar to the grounding bushing (fig 250.51 pg. 248)

 

[infinity]

Are you asking why can't the GEC connect to the grounding bushing? If so the answer it that it can. It is also permissible to install a separate bonding jumper to the bushing.

 

[gsstaley@sbcglobal.net]

I saw no reason why I couldn't, but was looking for a graphic to show that it could be ok.

 

[infinity]

How about this:

Minimizing the Choke Effect: Understanding ferrous metal raceway bonding

Recently, I was asked to explain the reason for the ferrous metal raceway bonding requirements in 250.64(E). Although the National Electrical Code never uses the term “choke effect,” many in the business understand its meaning, and the Code rules that it applies when an AC grounding...

www.ecmag.com

 

[tom baker]

Good explanation. Also the larger diameter of the steel conduit decrease the impedance due to skin effect (as described in the IEEE green book)

 

[suemarkp]

You shouldn't sharply bend a GEC. The drawing above shows why separate bonding jumpers to the raceway are better.