strain on conductors

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wireman1

wireman1

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electrical contractor will be pulling 4 600 kcmil conductors in ridgid conduit up to the 6th floor of a bulding.there will be 4 runs of pipe. should the wires that are inside pipe be supported so the weight of all the wires dont put a strain on terminals when thay are landed and cause problems , or even fall back down the pipe. i have heard of this happening . is there such a device called a wedge which you place inside the pipe to help prevent this? is there other means which could redemy this problem ? is it also mandated in any part of the code i cant seem to find any reference . any help would be appreciated .
 
wireman1 said:
electrical contractor will be pulling 4 600 kcmil conductors in ridgid conduit up to the 6th floor of a bulding.there will be 4 runs of pipe. should the wires that are inside pipe be supported so the weight of all the wires dont put a strain on terminals when thay are landed and cause problems , or even fall back down the pipe. i have heard of this happening . is there such a device called a wedge which you place inside the pipe to help prevent this? is there other means which could redemy this problem ? is it also mandated in any part of the code i cant seem to find any reference . any help would be appreciated .
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I was goin to say 300.19 But nevermind!!:confused: how do they do that???
 
Here's an example of an OZ/Gedney cable support bushing:

FamQACable.gif


Basically it's a special tapered bushing with a wooden chock that is installed after the cable is pulled.
 
Without the wedge shown above, you could end up with all that wire piled up on the bottom floor. It's dangerous for anyone to be around it when it falls. Whipping it's way down.
 
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