Service Bonding

[websparky]

Here is a drawing of a service in a new building I inspected the other day.

After opening the enclosures I thought something was not right with the bonding. The drawing only has the bonding shown, not phase conductors.

The big green rectangle is a grounding bar with lugs attached to the junction box. The green dots are the only places the bonding is connected.

Please tell me if you agree with me that the bonding is lacking and if so, where.

 

[bphgravity]

Re: Service Bonding

Article 250.92: All service raceways including the gutter needs to be bonded, All service enclosures including the J-box needs bonding. Bonding bushing-type locknuts at one end of the EMT terminations.

 

[tom baker]

Re: Service Bonding

The grounding electrode conductor is to be unspliced 250.58(C). its connection to the bussbar would have to be cadwelded or use of transfomer split bolt stud.
Thanks for taking the time on the drawing.
Each raceway or junction box with service entrance conductors must be bonded at one end per 250.92

 

[websparky]

Re: Service Bonding

Bryan and Tom,

Thanks for your replies!
Here is an updated drawing to reflect the code requirements for the bonding of the GEC only.
Do you agree this is correct?

 

[hurk27]

Re: Service Bonding

Dave
Nice drawing.
Remember the water ground has to be supplmented by at least one other electrode.

 

[websparky]

Re: Service Bonding

Thanks Wayne!

Yes, I agree.

Thanks!

PS. I was too lazy to draw it in.

 

[websparky]

Re: Service Bonding

Hi Guys,

Here is the dilema I am trying to figure out.
This is a new install and almost ready for final inspection.
I changed the above drawing to 800A to illustrate the method I am having a problem with.
In my opinion, the addition of EGC's from the XFR to the service disco creates a problem. Not to mention the bonding is not proper.

What would be the electricians simplest method to satisfy code(aside from the bonding)?
OR
Is there something I am not seeing?

Thanks for your help!

250.24 (2) Outdoor Transformer. Where the transformer supplying the service is located outside the building, at least one additional grounding connection shall be made from the grounded service conductor to a grounding electrode, either at the transformer or elsewhere outside the building.

 

[don_resqcapt19]

Re: Service Bonding

In my opinion the use of EGCs on the line side of the service disconnect results in a violation of 310.4. There is no reason for these conductors to be installed. The grounded conductor is used for all bonding and grounding on the line side of the service disconnect(s).
Don

 

[websparky]

Re: Service Bonding

Hi Don,

I agree. I have never installed one like this nor have I seen one either! When I first opened the big J-box it took me a few moments to grasp what was wrong with the picture!

Well, I can imagine the contractor will be thrilled to hear about this one!

Thanks,

[ May 02, 2004, 03:41 PM: Message edited by: websparky ]

 

[roger]

Re: Service Bonding

Hello Dave, I absolutly agree with Don, not to mention the waste of material and effort to install this violation of 310.4.

The simple explanation is, (as you know) on the line side the Grounded Conductor plays a dual roll of Neutral or Current Carrying Conductor and Equipment Grounding Conductor

Roger

 

[websparky]

Re: Service Bonding

Hi Roger,

Thanks, I appreciate your responce!