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#193636 - 04/12/10 12:06 AM EGC and Manual Transfer Switch  
George393  Offline
New Member
Joined: Apr 2010
Posts: 5
AL
A customer requests an addtional circuit (3 outlets) in a stand alone garage.

She has an outside 100 AMP disconnect at the entrance. From there the feeder goes direct to the oposite side of the house and terminates at a Ronk 100 AMP manual transfer switch (for a portable generator hookup).

EGC and all neutrals from the single house distribution panel and the stand alone garage distribution panel are bonded together inside the Ronk manual transfer switch. The house distribution panel and the stand alone garage distribution panel have egc and neutral seperate as required in each panel.

House panel is 125 AMP service. Stand alone garage panel is 100 AMP service.

I cannot find a code section on this.
Q - Can both these two distribution panels be bonded together (EGC and neutral) at the same location inside the Ronk manual transfer switch?
Q - If they can be does the 1st bond of neutral and ground at the outside service entrance disconnect (on the other side of the house) cause a problem by being a second EGC and neutral bond?

Thanks.


Work Gear for Electricians and the Trades

#193640 - 04/12/10 03:25 AM Re: EGC and Manual Transfer Switch [Re: George393]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
Short answer, no if the transfer equipment is not switching the neutral. You can only have one main bonding jumper in the system at a time.


Greg Fretwell

#193652 - 04/12/10 06:37 PM Re: EGC and Manual Transfer Switch [Re: gfretwell]  
George393  Offline
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Joined: Apr 2010
Posts: 5
AL
Thanks Greg


#193662 - 04/13/10 08:16 AM Re: EGC and Manual Transfer Switch [Re: George393]  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
well one can see the confusion in possibly having to add a GEC to the stand alone garage because it exceeds a single circuit here, and the specture of a SDS introduced.

In fact, many genny manufaturers provide a lug for a GEC to be made off it as well....

~S~


#193666 - 04/13/10 10:54 AM Re: EGC and Manual Transfer Switch [Re: sparky]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
The real issue is not the ground electrode. It is the bonding jumper regrounding the neutral. As long as you keep the concept in mind that you can only have one bonding jumper in the system at any time and coordinate your transfer equipment and whether or not your generator is bonded you will be OK. The EGC system should always be connected together. It is the neutral that you switch or not.


Greg Fretwell

#193672 - 04/13/10 06:53 PM Re: EGC and Manual Transfer Switch [Re: gfretwell]  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
well said, an a very good general concept to keep in mind Greg

~S~


#193675 - 04/13/10 08:44 PM Re: EGC and Manual Transfer Switch [Re: sparky]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
I didn't invent it. This was the way Jim Pauley on one of his road shows (a Soares pitch) explained it and it made perfect sense.


Greg Fretwell

#193693 - 04/14/10 08:15 AM Re: EGC and Manual Transfer Switch [Re: gfretwell]  
sparky  Offline
Member
Joined: Oct 2000
Posts: 5,303
Well Mr. Pauley saved himself lots of code-speak, reminds me of when i was told 'If it's metal, and doesn't move, bond it'

~S~


#193699 - 04/14/10 10:12 AM Re: EGC and Manual Transfer Switch [Re: sparky]  
George393  Offline
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Joined: Apr 2010
Posts: 5
AL
Between Soars book on grounding and Mike Holts grounding and bonding book - which would you rather have in your library?


#193700 - 04/14/10 11:59 AM Re: EGC and Manual Transfer Switch [Re: sparky]  
gfretwell  Offline


Member
Joined: Jul 2004
Posts: 9,057
Estero,Fl,usa
Why wouldn't you bond things that move?
That's why they make braided bonding straps and stranded green wire wink

Maybe I spent too much time on the load side of the plug cap.
We bonded everything metal. Even a hinged cover got a bonding strap.


Greg Fretwell

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