Use of split bolts for bonding.

[greg1]

T&B split bolts are listed as bonding connectors. Isn't one of requirements for bonding to have permanent and continuous path in case of a fault?
What's the definition of permanent?
I could not find any torque requirements for split bolts either.
People are afraid to strip cooper bolts and not torque them enough.
Without torque standards there is no meaningful way to inspect the bond.
Am I missing something?
I'm dealing with 4160 volt system and have plenty semi-loose kerneys.
Please, show me the way.

Greg

 

[mdshunk]

Kearney bugs at 4160 is just a little funny to me, in a twisted kind of way.

 

[Pierre C Belarge]

Greg
With those voltages, it might behove you to consult with someone from the POCO, they have more experience with such installations.
If you do, please let us know what they have to say.

 

[dcspector]

That is why they use Burndy, etc. with a Hi Press connector and tool.

 

[mark henderson]

I will Quote the 1 post from the other thread here since the MODS are napping:grin:

#2 Today, 07:10 AM
m73214
Senior Member Join Date: Dec 2005
Location: Wisconsin/Arizona
Posts: 385



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The GEC must be continuous, spliced only by irreversible means, but you could have taps off of it using split bolts. As far as torque specs......make sure they are wrench tight.
__________________
Tom

 

[dcspector]

Tom. Yes, the key word was and is "BONDING" ...no irreversible required. ZZZZZZZZZZZ:smile:

Mark, thanks

 

[greg1]

Thanks for the comments.
Irreversible is not required but per 100A (Bonding) "permanent joining" is required. Is the "permanent" equal to "irreversible"?
I know that split bolts are used for post bonding and advertised as such device. I'm just not sure if this is UL approved device for bonding or just left to be judgment call by inspector. It is hard for me to accept split bolts as bonding connectors knowing that they do not have any other means to lock itself in place then cooper thread friction. Thermal expansion and vibration could loosen the nut with time. If one has to allow use of kearneys they should be taped at least. I got torque recommendation for split bolts and they seam to be lower then regular bolts.

How do I find if split bolts are approved method for bonding?

Greg (Junior)

 

[earshavewalls]

See Article 250.8.
Connection of Grounding and Bonding Equipment.
Grounding conductors and bonding jumpers shall be connected by exothermic welding, listed pressure connectors, listed clamps, or other listed means. Connection devices or fittings that depend solely on solder shall not be used. Sheet metal screws shall not be used to connect grounding conductors to enclosures.

And Article 250.102(B)
Equipment Bonding Jumpers
Attachment
Equipment bonding jumpers shall be attached in the manner specified by the applicable provisions of 250.8 for circuits and equipment and 250.70 for grounding electrodes.

250.70 lists: exothermic welding, listed lugs, listed pressure connectors, listed clamps, or other listed means.