Bending Radius

[lmchenry]

What size bending radius would be needed on 3/0 THHN in a subpanel? Would it be eight times the diameter?

 

[dcspector]

What size bending radius would be needed on 3/0 THHN in a subpanel? Would it be eight times the diameter?

How do the feeders enter? See 312.6

 

[jim dungar]

Technically THHN does not have any minimum bending radius.

However, when entering or exiting an enclosure you follow 312.6 and, specifically, when terminating the conductors you need to follow 312.6(A) or 312.6(B).

 

[nakulak]

its my opinion that in order not to violate the ul listing of the conductor you must be certain that you abide by the manufacturer's instructions. For example, the following manufacturer's instructions (scroll down) tell you to go to the (2nd link listed) and there they specify a bending radius for their THHN single conductors

http://cerrowire.com/default.aspx?id=3219

http://cerrowire.com/default.aspx?id=3225

 

[jim dungar]

its my opinion that in order not to violate the ul listing of the conductor you must be certain that you abide by the manufacturer's instructions. For example, the following manufacturer's instructions (scroll down) tell you to go to the (2nd link listed) and there they specify a bending radius for their THHN single conductors

http://cerrowire.com/default.aspx?id=3219

http://cerrowire.com/default.aspx?id=3225

These are general values, from ICEA, for use during pulling and are not specific to any insulation.

 

[Twoskinsoneman]

its my opinion that in order not to violate the ul listing of the conductor
http://cerrowire.com/default.aspx?id=3219

http://cerrowire.com/default.aspx?id=3225

This bend radius info does not appear to be in the UL listing....
Unless it comes as labeling on the purchased conductor there is no violation.