Hogan Grounding

[pmariu]

When you have to use hogan groundig ,and how you doing it, can somebody
explain it please Thank you

 

[Dennis Alwon]

I have never heard the term--googled it and got nothing. Care to explain

 

[raider1]

Please someone explain it to me as well, as I have never heard the term "Hogan ground".

Chris

 

[mdshunk]

The only thing I know as a "Hogan" is the big busbar (generally 2" x 1/4") that they run up the utility chase of tall buildings for everyone to bond everything that needs bonded to that bar along the way. That bar is connected to the building steel, water lines, and any other grounding electrodes already.

 

[ryan_618]

The only time I have heard the term "Hogan grounding" is for grounding multiple transformers that are on multiple floors to a common grounding electrode.
For example, if one had a ten story building and wanted to use the concrete encased electrode for the transformers, they could run a piece of 3/0AWG from the top floor to the bottom floor and install grounding electrode conductor taps from each transformer to the common grounding electrode conductor. The tap conductors would be sized in accordance with Table 250.66, based on the size of the ungrounded secondary conductors of the individual transformer it serves.

 

[brian john]

Colonel Klink anyone?

 

[rcarroll]

Great! Learned something new today. I've seen a lot of that type of grounding, typically in techno buildings. :smile:

 

[ryan_618]

My understanding is the term "Hogan" came from an inspector named Hogan in the Chicago area that required (or perhaps permitted) this type of system for multiple transformers.

 

[blue spark]

That's how it was explained to me in code class last time around. There was another term but I can't remember it right now. Only for xformers though.

 

[cowboyjwc]

Whew! for a minute there I was afraid I was going to be the only one asking what the heck that was.

I didn't know the term, but at least I knew what it was after it was explained.

 

[Dennis Alwon]

I wonder if his name is Jameson Hogan click here

 

[mdshunk]

I wonder if his name is Jameson Hogan click here

Seeing how that guy just got out of school a few years ago, I doubt it.

 

[grich]

Colonel Klink anyone?

Here ya go...

Hogannnnnnnnnnnnnn!!!!

 

[dereckbc]

In my biz we call it a Vertical Riser which can be a buss bar or large copper cable rising vertically through a building shaft, and bonded to building steel as it rises the length of the building. It is a great ground reference when used correctly.

 

[crossman]

As in 250.30(A)(4)? I never knew it was a "Hogan" ground.

 

[knaack134]

Hogan is from chicago

Hogan is from chicago

The term "Hogan ground" is named for a former president of local 134 (chicago IBEW). The Hogan grounding system is a continuation of the groundind electrode conductor. It is typically used in high rise builings and required by Chicago code.

 

[jdsmith]

In my biz we call it a Vertical Riser which can be a buss bar or large copper cable rising vertically through a building shaft, and bonded to building steel as it rises the length of the building. It is a great ground reference when used correctly.

Can you elaborate on the used correctly part? How do people screw it up, other than extra neutral/ground bonds?

 

[Mike Bean]

Bill Hogan was the chief electrical inspector in Chicago through the 1960's into the 70's. He was tough and was the quinessential AHJ. "Rumors" of inspector pay-offs in the late 70's forced the City to completly re-structure the Builidng Department.

He did in fact "require" this form of transformer grounding which bares his name.

He was a Chicago classic.

You could look it up

 

[cschmid]

I learned something this morning..I hope there is no quiz on this later on..

 

[dereckbc]

Can you elaborate on the used correctly part? How do people screw it up, other than extra neutral/ground bonds?

By not bonding it to building steel at every floor or every other floor as it rises