[SML] Was Torqueing truss, Now Grounding Truss

[joel harari]

For a little more clarity these specialty "dragontooth" washers are supposed to be instead of a more traditional grounding clamp.

Also due to the aggressive "teeth" on these washers the truss will almost certainly need to be destroyed because they dig into the end caps of the truss.

Using these things essentially makes truss single use.

Joel Harari
Sent from phone, please excuse spelling & grammar
________________________________
From: Stagecraft <stagecraft-bounces at theatrical.net> on behalf of Bruce Bennett via Stagecraft <stagecraft at theatrical.net>
Sent: Sunday, March 24, 2024 12:12:42 PM
To: Stagecraft Mailing List <stagecraft at theatrical.net>
Cc: Bruce Bennett <bennett.bruce at gmail.com>
Subject: Re: [SML] Was Torqueing truss, Now Grounding Truss

If truss bolts are significant in the path that conducts fault currents to ground, a toothed washer could help reduce impedance.

I anticipate conductivity along a truss is primarily through adjacent sections of truss being pressed together by torque applied to the bolts.

Bruce

> On Mar 24, 2024, at 13:08, Dale Farmer via Stagecraft <stagecraft at theatrical.net> wrote:
>
> I expect that the truss manufacturers specify the washers and bolts, and not using them would at least void any warranty, let alone what that would do to legal liability after an accident.
>
> Dale
>
>> On 3/23/2024 10:16 PM, Joe Golden via Stagecraft wrote:
>> Not to totally hijack Joel's query about torqueing truss, but I was recently asked about adding "dragontooth" washers to truss bolts to ensure that there was a "proper" ground path for ground supported structures. This also doesn't bring into play the dissimilar metals and needing to use NolOx or something similar at each bolt.
>> I checked ANSI E1.21 and the only mention of grounding was to clean the tube with steel wool before applying the ground clamp.
>> Does anyone have any other citations not to use these washers. I am against it do to excessive wear of the bolt plates.
>> Joe Golden
>> ____________________________________________________________
>> For list information see <http://stagecraft.theprices.net/>
>> Stagecraft mailing list
>> Stagecraft at theatrical.net
>> http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net
>
>
> ____________________________________________________________
> For list information see <http://stagecraft.theprices.net/>
> Stagecraft mailing list
> Stagecraft at theatrical.net
> http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net

____________________________________________________________
For list information see <http://stagecraft.theprices.net/>
Stagecraft mailing list
Stagecraft at theatrical.net
http://theatrical.net/mailman/listinfo/stagecraft_theatrical.net
-------------- next part --------------
An HTML attachment was scrubbed...
URL: <http://theatrical.net/pipermail/stagecraft_theatrical.net/attachments/20240324/6cb7277b/attachment.html>