Cable Tray Bend

T

timm333

Senior Member
Location
Minneapolis, MN
Occupation
Electrical Design Engineer
Table 2 of NEC provides the minimum radius of conduit bends. Is there some similar table or other reference available for the minimum radius of cable tray bends?

For example, if we have to make a field bend for a 12” (300mm) metallic ladder tray using straight sections of this tray, then how much should be the minimum radius of this field bend? Thanks
 
NEC 392.18(A) states that field bends of trays are possible. Yes we cut the straight sections of tray and then bolt the pieces together, but I am thinking that in this way the bend will not have any curve.

Let me put question this way. Will it be Ok that we cut it and bolt pieces together, and then pull cables through this bend which does not have any curve? Thanks
 
It is possible to buy bends of different radius for the same width of tray. For example for the same 6” width of tray: bends are available in radius of 12”, 24”, 36”, and 48”.

When we fabricate the bends in the field by cutting it and bolting it, then is it still possible to make the bends of different radius for the same 6" width of tray?
 
In my opinion, NEMA VE-1 it could be a source of information. For metalic cable tray it is 2009 edition.
 

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timm333 said:
Table 2 of NEC provides the minimum radius of conduit bends. Is there some similar table or other reference available for the minimum radius of cable tray bends?

For example, if we have to make a field bend for a 12” (300mm) metallic ladder tray using straight sections of this tray, then how much should be the minimum radius of this field bend? Thanks
Click to expand...
Most cable tray, especially the basket type, manufacturers will have instructions to know how to make a field bend in their cable tray.
 
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