unsupported conductors in cable tray snapping

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scooterrox24

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Location
Cleveland, Oh
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Electrician
Hello all!

This totally seems to be a fever dream, but I thought during my apprenticeship i saw a video of a cable in a cable tray snapping or jumping up from being over loaded and it was shown because it was giving an example of the importance of supporting conductors to the tray. When I've asked around about it no one seems to know what I am talking about. If any of you guys know what I'm talking about or have a link to the video that would be so greatly appreciated!
 
I'm glad this came up.
I will be doing an MV cable install in cable tray. I will copy this link for pre install discussion with the apprentices. A video it much better than listening to me talk.
Thank you
 
scooterrox24 said:
Hello all!

This totally seems to be a fever dream, but I thought during my apprenticeship i saw a video of a cable in a cable tray snapping or jumping up from being over loaded and it was shown because it was giving an example of the importance of supporting conductors to the tray. When I've asked around about it no one seems to know what I am talking about. If any of you guys know what I'm talking about or have a link to the video that would be so greatly appreciated!
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You mean securing but not just supporting cables in trays? Cable trays often support as simply allowing cables to lay on them but securing them so they do not move or fall out is another thing
 
You should see my welding cables dance when striking an arc at like 350 amps. Not enough to break anything, but enough to provide a clear example of the concept.
 
ptonsparky said:
I've heard the wires jump in a conduit on startup of motor loads. SEWAG, they would move in cable tray under similar loading, so it's not just for fault current.
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Yep. Startup current is very similar to a short circuit and nowhere near a simply overload.
 
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