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1793

Senior Member
I would like to know your position, opinion etc. regarding, "250.94 Bonding for Other Systems". Would you allow the Intersystem Bonding Terminal to be connected to the ground rod with a #6, via a 2nd, approved, ground clamp?

Thanks in advance.
 

texie

Senior Member
Location
Fort Collins, Colorado
Occupation
Electrician, Contractor, Inspector
I would like to know your position, opinion etc. regarding, "250.94 Bonding for Other Systems". Would you allow the Intersystem Bonding Terminal to be connected to the ground rod with a #6, via a 2nd, approved, ground clamp?

Thanks in advance.
I would think that it complies with 250.94(4). I guess one could argue that it needs to go to the GEC not the rod, but that seems petty.
 

jumper

Senior Member
Are you asking if a separate #6 can be used to connect a IBT buss to a rod electrode instead of using the GEC?

Not an inspector, but if so yes, IMO.

The GEC is connected to the rods and IBT conductor is connected to the rods, therefore both are connected together via the rods.
 
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jumper

Senior Member
Yes, let me add to avoid confusion, the separate #6 is connected to an existing ground rod connected to the main panel.
I edited a bit while you posted, but I will say compliant IMO. Maybe not directly stated in NEC: but doesn't this accomplish the same thing as any of the other connections in 250.94 or am I missing something?
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
How does the piece of #6 qualify as one of the methods mentioned in 250.94(1) ,(2) or (3)?

250.94
The intersystem bonding termination shall be one of the
following:
(1) A set of terminals securely mounted to the meter enclosure
and electrically connected to the meter enclosure.
The terminals shall be listed as grounding and bonding
equipment.
(2) A bonding bar near the service equipment enclosure,
meter enclosure, or raceway for service conductors.
The bonding bar shall be connected with a minimum
6 AWG copper conductor to an equipment grounding
conductor(s) in the service equipment enclosure, meter
enclosure, or exposed nonflexible metallic raceway.
(3) A bonding bar near the grounding electrode conductor.
The bonding bar shall be connected to the grounding
electrode conductor with a minimum 6 AWG copper
conductor.
 

1793

Senior Member
How does the piece of #6 qualify as one of the methods mentioned in 250.94(1) ,(2) or (3)?
250.94
...

(4) At the service equipment, be securely mounted and
electrically connected to an enclosure for the service
equipment, to the meter enclosure, or to an exposed
nonflexible metallic service raceway, or be mounted at
one of these enclosures and be connected to the enclosure
or to the grounding electrode conductor with a
minimum 6 AWG copper conductor
...

This is what I'm using to support my installation.
 

iwire

Moderator
Staff member
Location
Massachusetts
250.94
...

(4) At the service equipment, be securely mounted and
electrically connected to an enclosure for the service
equipment, to the meter enclosure, or to an exposed
nonflexible metallic service raceway, or be mounted at
one of these enclosures and be connected to the enclosure
or to the grounding electrode conductor
with a
minimum 6 AWG copper conductor
...

This is what I'm using to support my installation.
But what you are using to support you installation is exactly what makes it a violation.

While I personally think that connecting to the rod would work fine I do not see it as an NEC compliant option.
 

1793

Senior Member
No, the problem is that there is no provision to connect to the rod. Technically you should attach your wire to the GEC going to the rod.

It really makes no difference, but that is how it is written.
This is what I have had concerns about, while not stated, I don't see how attaching to the GR is any different than installing a Split Bolt, Kernie, to the GEC.
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
250.94(4) is just a way to connect the required intersystem bonding termination. IMO you still need some sort of terminal.

250.94 Bonding for Other Systems. An intersystem bonding
termination for connecting intersystem bonding conductors
required for other systems shall be provided external
to enclosures at the service equipment or metering
equipment enclosure and at the disconnecting means for
any additional buildings or structures. The intersystem
bonding termination
shall comply with the following:
(1) Be accessible for connection and inspection.
(2) Consist of a set of terminals with the capacity for connection
of not less than three intersystem bonding conductors.
(3) Not interfere with opening the enclosure for a service,
building or structure disconnecting means, or metering
equipment.
(4) At the service equipment, be securely mounted and
electrically connected to an enclosure for the service
equipment, to the meter enclosure, or to an exposed
nonflexible metallic service raceway, or be mounted at
one of these enclosures and be connected to the enclosure
or to the grounding electrode conductor with a
minimum 6 AWG copper conductor
(5) At the disconnecting means for a building or structure,
be securely mounted and electrically connected to the
metallic enclosure for the building or structure disconnecting
means, or be mounted at the disconnecting
means and be connected to the metallic enclosure or to
the grounding electrode conductor with a minimum 6
AWG copper conductor.
(6) The terminals shall be listed as grounding and bonding
equipment.
 

iwire

Moderator
Staff member
Location
Massachusetts
This is what I have had concerns about, while not stated, I don't see how attaching to the GR is any different than installing a Split Bolt, Kernie, to the GEC.
I agree as far as functionality but code wise they gave us two choices and you went with a third.

Perhaps the section should say 'any point of the grounding electrode system' but unfortunately it does not.
 

1793

Senior Member
250.94(4) is just a way to connect the required intersystem bonding termination. IMO you still need some sort of terminal.
I'm not sure I follow. I always use the Arlington Intersystem Binding Block attached to the #6 attached to the GR.

I agree wit iWire that this section should read something like "attached anywhere along the GES."
 

jumper

Senior Member
I'm not sure I follow. I always use the Arlington Intersystem Binding Block attached to the #6 attached to the GR.

I agree wit iWire that this section should read something like "attached anywhere along the GES."

Norb, it really comes down to this: instead of using a clamp on the rod, just bug nut to the GEC going to the rod.

What you are doing is fine, but ya got a technical violation. It may be BS, but tis written that way.
 

infinity

Moderator
Staff member
Location
New Jersey
Occupation
Journeyman Electrician
I'm not sure I follow. I always use the Arlington Intersystem Binding Block attached to the #6 attached to the GR.

I agree wit iWire that this section should read something like "attached anywhere along the GES."
I didn't follow so let's pretend that I never posted in this thread. :ashamed1:
 
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