Securing Cables with 3/8" Nylon Rope

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mac380abc

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A few years back I was doing a large 2400 amp disconnect, Upon inspection the inspector had told me he wanted the cable lashed together so as they
won't come loose and dance around in the cabinet. I am now an Engineer for a large company, putting in a 1200 amp 480 volt disconnect, when I mentioned
that they need to lash all the lines going into the lugs, they said that was an old technique and wasn't used anymore. Upon looking at the specs on the
torque specs ect. I noticed there was a notification that wanted all the legs lashed 6" above the connection with 3/8"Nylon Rope. I showed them the Mfg.
spec, and they said the inspector does not check that when they are check torque ect. Is this technique a code requirement? If not must it be done if the
manufacturer requires it on the install labels on the inside the door? Your opinion would be greatly appreciated..
 
Been a few years since I've done a service > 1200 amps but it was required then and as long as the manufacturer requires it the inspector should enforce it
 
If the labels require it, then you would be required to lash the cables based on 110.3(B). However read the label, it often only applies where the available fault current is above a stated value. Some of the ones I did, only required lashing where the available fault current exceeded 50 kA.
 
110.3B.
(B) Installation and Use. Listed or labeled equipment shall be installed and used in accordance with any instructions included in the listing or labeling.
Click to expand...
If it says it, ya gotta do it.

This is a clip from the Allen Bradley MCC installation manual.
Lacing.JPG

Here is what Eaton has to say about it regarding their switchgear.
 
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don_resqcapt19 said:
If the labels require it, then you would be required to lash the cables based on 110.3(B). However read the label, it often only applies where the available fault current is above a stated value. Some of the ones I did, only required lashing where the available fault current exceeded 50 kA.
Click to expand...
Based on NEC Article 110.3 (B) Equipment that is listed, labeled, or both, or identified for use shall be installed and used in accordance with any
instructions included in the listing, labeling, or identification. The one I questioned to the electrical installer was that this was an old technique
and not used anymore. Upon my reading the install sheet on the equipment stated SECURMENT OF CABLES with an outline and full instructions
on how to proceed. Thanks for your input, was able to back up my decision to have the installers lash the cables as outlined in the manufacturers
instructions. With the code requiring that the manufacturers instructions be followed..
 
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